Oven Controlled Crystal Oscillator (OCXO) Market Size, Share & Trends Analysis Report By Product (SMD Shape, PIN Shape), By Applications (Telecom Infrastructure, Military & Space, Industrial & Medical, Other), By End Use, By Region, and Segment Forecasts - 2035

Oven Controlled Crystal Oscillator (OCXO) Market Overview

The oven controlled crystal oscillator (ocxo) market size is expected to grow from USD 157.42 million in 2025 to USD 160.47 million in 2026 and is forecast to reach USD 170 million by 2035 at 1.94% CAGR over 2026-2035.

The Oven Controlled Crystal Oscillator (OCXO) Market is evolving around increasingly strict synchronization, frequency stability, low phase noise, holdover performance, miniaturization, and high-temperature operation across telecommunications, defense, space, industrial instrumentation, and medical electronics. SMD Shape accounts for an estimated 64% of current product demand because compact surface-mount packages align with dense radio units, routers, timing cards, industrial control boards, and next-generation communications equipment, while PIN Shape represents approximately 36%. Telecom Infrastructure accounts for an estimated 46% of application demand, followed by Military & Space at approximately 27%, Industrial & Medical at around 18%, and Other applications at 9%. Modern compact OCXOs can operate from approximately 10 MHz to 50 MHz while providing temperature stability around plus or minus 10 to 30 parts per billion depending on package and operating range. New 7.2 mm by 5.3 mm SMD products operate at temperatures reaching 105 degrees Celsius and consume only around 0.5 W during steady-state operation, demonstrating the industry's shift toward compact precision timing.

The United States remains an important OCXO market because of telecommunications infrastructure, cloud data centers, military electronics, aerospace systems, semiconductor test equipment, networking hardware, industrial automation, precision instrumentation, and medical technology. North America accounts for an estimated 29% of global demand, with the United States representing more than 85% of regional activity. Abracon provides direct U.S. representation among the supplied companies and offers surface-mount OCXOs as small as approximately 7 mm by 5 mm, with frequency ranges extending from 10 MHz to 40 MHz and stability near 30 parts per billion. PIN Shape products remain important in radar, defense radios, satellite systems, test instruments, and legacy telecommunications platforms because larger packages can support ultra-low phase noise and more demanding thermal architectures. U.S. demand is increasingly influenced by artificial-intelligence data centers and network synchronization, where timing cards, switches, routers, and high-speed optical systems require stable reference clocks.

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Key Findings

• Leading Product Type: SMD Shape is expected to lead with approximately 64% market share as compact telecom, industrial, server, and embedded designs increasingly require OCXOs below 10 mm package dimensions.
• Leading Application: Telecom Infrastructure is projected to account for approximately 46% of demand because 5G base stations, routers, timing cards, SyncE systems, and optical networks require highly stable frequency references.
• Leading Region: Asia-Pacific is expected to hold approximately 43% market share, supported by telecommunications equipment production, 5G infrastructure, electronics manufacturing, data centers, and established crystal-device supply chains.
• Fastest Growing Region: Asia-Pacific is projected to expand at approximately 2.8% annually as network densification, AI servers, industrial electronics, and regional telecommunications equipment production increase precision timing requirements.
• Technology Trend: Miniaturized high-temperature OCXOs are advancing rapidly, with new SMD devices measuring approximately 7.2 mm by 5.3 mm while operating at temperatures reaching 105 degrees Celsius.
• Market Driver: 5G synchronization remains a major demand catalyst as compact OCXOs increasingly provide frequency stability around plus or minus 20 parts per billion for high-capacity radio and timing systems.
• Competitive Landscape: Suppliers are strengthening ultra-low-noise portfolios, with advanced OCXOs delivering phase-noise performance near minus 156 dBc/Hz at 1 kHz offset for precision communications applications.
• Future Outlook: Lower-power timing will shape future designs as compact OCXOs increasingly target steady-state consumption near 0.5 W while maintaining nanosecond-class network synchronization performance.

Latest Trends

Miniaturization represents one of the strongest trends in the Oven Controlled Crystal Oscillator (OCXO) Market. Conventional OCXOs historically occupied relatively large board areas because the quartz resonator, oscillator circuit, heater, thermal insulation, control electronics, and package all needed to maintain the crystal at a tightly regulated temperature. New devices are reducing this footprint significantly. Recent SMD OCXOs have reached approximately 7.2 mm by 5.3 mm by 3.3 mm and 9.5 mm by 7.3 mm by 4.1 mm while maintaining frequency ranges from approximately 10 MHz to 50 MHz. Such products support 10 MHz, 20 MHz, 38.88 MHz, and 48 MHz reference frequencies commonly required by communications and timing equipment. Compact dimensions are particularly valuable in 5G Radio Units, small cells, timing cards, AI servers, routers, optical transport equipment, and edge systems where printed-circuit-board area is increasingly constrained. This trend strongly supports SMD Shape's estimated 64% market share.

Low phase noise and high-temperature operation form another major trend. Compact SMD OCXOs designed for telecommunications can now operate from approximately minus 40 degrees Celsius to plus 105 degrees Celsius, allowing deployment in outdoor radio units exposed to direct sunlight and demanding thermal conditions. Advanced devices can provide phase noise near minus 78 dBc/Hz at 1 Hz, minus 156 dBc/Hz at 1 kHz, and minus 162 dBc/Hz at 1 MHz offset around a 20 MHz carrier. PIN Shape devices remain technically competitive in ultra-low-noise applications, with selected larger packages reaching approximately minus 165 dBc/Hz to minus 180 dBc/Hz at higher frequency offsets. These improvements are important in phased-array radar, electronic warfare, 5G and future 6G radio systems, high-speed data conversion, and precision metrology, where oscillator noise can directly limit the performance of the entire signal chain.

Market Dynamics

Driver

""5G synchronization and precision networking are increasing demand for stable timing references.""

Telecommunications infrastructure remains the strongest structural driver of the Oven Controlled Crystal Oscillator (OCXO) Market and accounts for approximately 46% of application demand. Modern 5G networks depend on extremely precise time and frequency synchronization between central units, distributed units, radio units, routers, transport equipment, and network timing systems. Time Division Duplex networks are particularly sensitive because base stations transmit and receive in coordinated time windows. A timing error between neighboring sites can create interference and reduce network quality. OCXOs provide the highly stable reference required to maintain synchronization, especially when GNSS signals are temporarily lost. Modern devices offer temperature stability near plus or minus 10 to 20 parts per billion and aging around plus or minus 1 part per billion per day in selected configurations, allowing network equipment to maintain accurate frequency during holdover conditions.

5G network densification further strengthens demand because millimeter-wave and high-frequency deployments require more radio sites than traditional macro-cell architectures. Small-cell equipment must fit into restricted locations such as poles, rooftops, street furniture, indoor venues, and compact cabinets. These environments favor SMD Shape products measuring less than approximately 10 mm on each major board dimension. A compact 7.2 mm by 5.3 mm OCXO can provide the precision required by a radio system without consuming the board area associated with older 20 mm or 25 mm packages. Telecommunications equipment manufacturers also increasingly require operating temperatures up to approximately 105 degrees Celsius because outdoor enclosures can heat significantly above ambient temperature. Miniaturized temperature-tolerant OCXOs therefore directly support next-generation network architecture.

Restraint

""Higher power consumption and premium component costs limit broader use in low-cost electronics.""

Power consumption represents an important restraint because an OCXO actively heats its quartz resonator to maintain a stable operating temperature. This creates substantially higher energy consumption than basic crystal oscillators, TCXOs, and several MEMS timing products. Compact modern OCXOs can reduce steady-state consumption toward approximately 0.5 W, but warm-up power is often higher because the oven must quickly reach its controlled temperature after startup. A battery-powered device consuming 0.5 W continuously from one timing component may experience a meaningful reduction in operating life. This limits OCXO adoption in smartphones, wearables, small portable sensors, and other consumer electronics where micro-watt or milli-watt power budgets are more important than extreme frequency stability.

Component cost also limits adoption outside high-value applications. OCXOs require high-quality quartz resonators, carefully designed oven structures, temperature sensors, heater control circuits, low-noise oscillator electronics, calibration, and extensive testing. A precision device may undergo thermal cycling across an operating range from approximately minus 40 degrees Celsius to plus 85 degrees Celsius or 105 degrees Celsius before shipment. This manufacturing complexity makes OCXOs substantially more expensive than simpler oscillator types. Telecom Infrastructure, Military & Space, and high-end Industrial & Medical applications can justify the additional cost because timing accuracy directly affects system performance. Lower-cost consumer products generally cannot, restricting overall market expansion and contributing to the relatively moderate 1.94% CAGR.

Opportunity

""AI data centers and distributed network timing create new opportunities beyond traditional telecom.""

Artificial-intelligence infrastructure represents an important new opportunity because AI servers, data-center switches, timing cards, optical networks, and distributed computing clusters require increasingly accurate synchronization. High-speed data centers contain thousands of servers connected through network fabrics operating at hundreds of gigabits per second. Timing errors can influence packet scheduling, distributed databases, financial transactions, network monitoring, and coordinated compute workloads. New compact OCXOs are specifically being positioned for AI servers and timing cards alongside traditional 5G applications. Frequency options such as 10 MHz, 20 MHz, 38.88 MHz, and 48 MHz allow integration with standard timing architectures. SMD products consuming approximately 0.5 W can provide a practical balance between precision and thermal efficiency in rack-scale systems.

Military & Space provides another significant opportunity and represents approximately 27% of current application demand. Radar, electronic warfare receivers, secure communications, navigation systems, satellites, ground stations, missile electronics, and test equipment require extremely stable low-noise reference oscillators. Larger PIN Shape products remain relevant because package volume can be used to improve thermal isolation and phase noise. Selected pin-through OCXOs support frequencies from approximately 8 MHz to 100 MHz and stability as tight as plus or minus 5 parts per billion in specialized designs. Low phase noise approaching minus 170 dBc/Hz or better at selected frequency offsets can materially improve radar resolution, receiver sensitivity, and communication signal purity. Defense modernization therefore provides a higher-value opportunity even when overall unit volumes remain below telecom applications.

Challenge

""Maintaining ultra-high stability in smaller packages creates difficult thermal engineering tradeoffs.""

Miniaturization creates a major engineering challenge because the fundamental purpose of an OCXO is to isolate the crystal from external temperature change. Reducing package size decreases the physical distance between the heated resonator and the external environment, increasing thermal leakage. Engineers must therefore achieve stronger insulation, faster control loops, efficient heaters, and highly accurate temperature sensing inside packages as small as approximately 7 mm by 5 mm. A device required to hold frequency within plus or minus 20 parts per billion across an operating range from minus 40 degrees Celsius to plus 105 degrees Celsius must maintain extremely precise internal temperature control despite dramatic environmental changes. Achieving this performance while consuming around 0.5 W requires careful coordination of quartz design, ASIC control, package materials, and thermal architecture.

Long-term aging represents another technical challenge because crystal frequency changes gradually over time even when temperature is controlled. High-performance OCXOs may achieve aging around plus or minus 1 part per billion per day during defined test periods, but network and military systems can operate continuously for 10 years or longer. Aging, mechanical stress, acceleration, vibration, and component drift therefore need to be managed across the full product life. Acceleration sensitivity can be limited to approximately 1 part per billion per g in advanced products, but high-vibration environments such as military vehicles, aircraft, and outdoor radio installations remain demanding. Manufacturers must combine precise crystal processing, package design, mechanical isolation, and calibration to maintain long-term stability.

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Segmentation Analysis

By Types

SMD Shape: SMD Shape accounts for approximately 64% of the Oven Controlled Crystal Oscillator (OCXO) Market and remains the leading product category because modern communications, industrial, server, and embedded systems require compact components compatible with automated surface-mount assembly. Current commercial products include packages around 7 mm by 5 mm and 9 mm by 7 mm, representing a substantial size reduction compared with traditional OCXOs. Frequency ranges commonly extend from approximately 10 MHz to 50 MHz, while specialized products can support wider ranges. Temperature stability can reach approximately plus or minus 10 to 30 parts per billion, depending on package and operating temperature. SMD Shape is particularly important in Telecom Infrastructure because base stations, routers, switches, SyncE equipment, IEEE 1588 systems, and AI timing cards require high precision while minimizing printed-circuit-board area.

PIN Shape: PIN Shape represents approximately 36% of current demand and remains highly important in ultra-low-phase-noise, military, aerospace, test, industrial, and legacy telecommunications applications. Larger packages such as 14-pin DIP and 20 mm to 25 mm square configurations provide more space for thermal insulation, larger quartz resonators, oven structures, and low-noise electronics. Commercial PIN Shape products can operate from approximately 8 MHz to 100 MHz and offer frequency stability as tight as plus or minus 5 parts per billion in selected models. Phase noise can reach approximately minus 170 dBc/Hz to minus 180 dBc/Hz at higher offset frequencies. These characteristics make PIN Shape especially suitable for radar, precision metrology, electronic warfare, scientific instrumentation, and laboratory frequency standards.

By Applications

Telecom Infrastructure: Telecom Infrastructure accounts for approximately 46% of OCXO Market demand and represents the largest application. 5G Radio Units, small cells, switches, routers, optical transport equipment, SyncE systems, IEEE 1588 platforms, SONET, OTN equipment, and Stratum timing devices rely on stable reference clocks. Standard frequencies include approximately 10 MHz, 20 MHz, 38.88 MHz, and 48 MHz. High-temperature outdoor systems increasingly require operation up to approximately 105 degrees Celsius, while phase-noise performance near minus 156 dBc/Hz at 1 kHz offset supports signal integrity. Network timing is particularly important during GNSS outages, when OCXO holdover helps maintain service continuity.

Military & Space: Military & Space represents approximately 27% of demand and includes radar, satellite communications, secure radios, navigation systems, electronic warfare, telemetry, guidance, ground stations, and precision timing equipment. These applications frequently prioritize ultra-low phase noise and long-term stability rather than compact size alone. Larger PIN Shape OCXOs can provide approximately plus or minus 5 to 50 parts per billion stability and phase-noise levels below minus 165 dBc/Hz at selected offsets. Radiation tolerance, vibration resistance, acceleration sensitivity, and extended-temperature operation also become important. Military buyers often require long product life cycles exceeding 10 years and detailed lot traceability.

Industrial & Medical: Industrial & Medical accounts for approximately 18% of market demand and includes semiconductor test systems, measurement instruments, factory automation, robotics, imaging equipment, scientific instruments, medical diagnostics, industrial communications, and synchronized control systems. Precision instrumentation may use 10 MHz or 100 MHz OCXO references for calibration and signal generation. Industrial environments can operate from approximately minus 40 degrees Celsius to plus 85 degrees Celsius, creating a need for thermal stability beyond standard commercial oscillators. Medical and analytical instruments also benefit from low phase noise where measurements rely on accurate high-frequency signal generation.

Other: Other applications represent approximately 9% of market demand and include financial timing, scientific research, broadcast systems, transportation electronics, metrology laboratories, power-grid synchronization, and specialized computing. High-frequency trading and distributed databases can require synchronization measured in microseconds or nanoseconds across geographically separated systems. Laboratory instruments use OCXOs as stable references for counters, synthesizers, analyzers, and calibration equipment. Emerging timing requirements in energy grids and autonomous systems may gradually expand this diversified segment through 2035.

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Regional Outlook

North America

North America accounts for approximately 29% of global Oven Controlled Crystal Oscillator (OCXO) Market demand and is supported by telecommunications networks, cloud computing, AI data centers, defense electronics, aerospace programs, industrial automation, medical equipment, and precision instrumentation. The United States represents more than 85% of regional activity and hosts Abracon among the supplied companies.

Demand increasingly focuses on compact low-phase-noise SMD products and highly stable PIN Shape devices for defense and instrumentation. Commercial SMD OCXOs available in the U.S. can measure approximately 7 mm by 5 mm and provide stability around 30 parts per billion. Larger PIN Shape devices can operate up to approximately 100 MHz while achieving phase noise approaching minus 180 dBc/Hz at selected offsets. AI data-center expansion is expected to create an additional timing requirement alongside established telecom and defense demand.

Europe

Europe accounts for approximately 21% of global demand and maintains substantial telecommunications equipment, defense electronics, aerospace, industrial automation, metrology, medical technology, and scientific-research activity. Germany, France, the United Kingdom, Italy, Sweden, and other markets use high-stability oscillators in network infrastructure and industrial systems.

5G modernization provides important demand because European operators continue densifying mobile networks and upgrading transport infrastructure. SMD Shape products representing approximately 64% of global demand fit the region's shift toward smaller energy-efficient radio equipment. European defense spending is also rising, supporting PIN Shape and specialized ruggedized OCXOs. Frequencies around 10 MHz remain particularly common because they provide a convenient precision reference for radar, test, navigation, and timing systems.

Asia-Pacific

Asia-Pacific leads the market with approximately 43% share because Japan, China, South Korea, Taiwan, India, and Southeast Asia combine telecommunications equipment production, semiconductor manufacturing, 5G deployment, electronics assembly, and data-center expansion. Epson and NDK provide strong Japanese representation among the supplied companies.

Japan remains particularly important in crystal technology. NDK introduced compact OCXOs measuring approximately 7.2 mm by 5.3 mm and 9.5 mm by 7.3 mm for 5G base stations and data centers, with mass production beginning during 2025. These products operate across approximately 10 MHz to 50 MHz and support temperatures reaching 105 degrees Celsius. Regional electronics manufacturing scale supports strong adoption across routers, servers, small cells, industrial equipment, and networking infrastructure.

Middle East & Africa

The Middle East & Africa collectively account for approximately 3% of current market demand. Gulf states provide the strongest opportunities because of rapid 5G deployment, cloud infrastructure, defense modernization, smart-city investment, and increasing data-center construction. African demand remains concentrated in telecommunications infrastructure and selected military applications.

High-temperature performance is particularly important across Gulf markets because outdoor telecommunications equipment can experience extreme thermal conditions. OCXOs rated to approximately 105 degrees Celsius therefore provide a technical advantage over products limited to 85 degrees Celsius. Compact SMD designs also suit pole-mounted and rooftop radio equipment where thermal density and enclosure size remain significant engineering constraints.

List of Top Oven Controlled Crystal Oscillator (OCXO) Companies

• Epson: Japan
• NDK (Nihon Dempa Kogyo Co., Ltd.): Japan
• Abracon: United States

Top 2 Companies Market Share

NDK (Nihon Dempa Kogyo Co., Ltd.): NDK is estimated to represent approximately 24% of competitive activity among the supplied companies, supported by vertically integrated quartz technology, long-standing telecommunications expertise, and advanced miniaturized OCXO development. Its 2025 compact series includes a 7.2 mm by 5.3 mm device and a 9.5 mm by 7.3 mm device covering approximately 10 MHz to 50 MHz. The smaller product supports operation from minus 40 degrees Celsius to plus 105 degrees Celsius with steady-state consumption around 0.5 W. Frequency temperature stability can remain within approximately plus or minus 20 parts per billion, while phase noise reaches around minus 156 dBc/Hz at 1 kHz offset.

Abracon: Abracon is estimated to account for approximately 19% of competitive activity among the supplied companies, supported by a broad portfolio spanning compact SMD and ultra-low-phase-noise PIN Shape OCXOs. Its small AOC75-class products occupy approximately 7 mm by 5 mm packages and support frequencies from about 10 MHz to 40 MHz with stability around 30 parts per billion. Larger precision pin-through products operate at frequencies up to approximately 100 MHz and can deliver phase-noise performance approaching minus 180 dBc/Hz at selected offsets. Together, NDK and Abracon represent an estimated 43% of competitive activity within the supplied group, while Epson competes through established quartz-device manufacturing, miniature oscillators, and high-volume electronic component integration.

Investment Analysis

Investment in the Oven Controlled Crystal Oscillator (OCXO) Market is increasingly directed toward miniaturized packaging, ASIC-based temperature control, high-Q synthetic quartz, low-noise oscillator circuits, precision trimming, automated calibration, and high-temperature qualification. SMD Shape accounts for approximately 64% of demand and provides the strongest volume opportunity as Telecom Infrastructure manufacturers require smaller timing components. Development of a 7.2 mm by 5.3 mm OCXO requires investment across quartz growth, wafer processing, resonator design, thermal simulation, package engineering, and semiconductor control electronics. Manufacturers that vertically integrate quartz growth and oscillator manufacturing can improve consistency because resonator characteristics strongly influence phase noise, aging, and temperature behavior.

High-performance defense and data-center timing also attracts investment. Military & Space accounts for approximately 27% of demand and supports premium PIN Shape products with stability around plus or minus 5 parts per billion and ultra-low phase noise. Telecom and AI infrastructure create an additional need for high-volume compact devices consuming around 0.5 W. Asia-Pacific remains the primary manufacturing investment region because it accounts for approximately 43% of global market demand and contains established crystal-device ecosystems. Investment through 2035 is expected to focus on more automated manufacturing, smaller oven structures, lower warm-up energy, high-temperature operation, and improved long-term aging.

New Product Development

New product development is concentrated on smaller SMD OCXOs with improved environmental performance. NDK's latest compact devices demonstrate this direction with dimensions of approximately 7.2 mm by 5.3 mm by 3.3 mm and 9.5 mm by 7.3 mm by 4.1 mm. The smaller design supports temperatures up to approximately 105 degrees Celsius while delivering steady-state power consumption near 0.5 W. Frequency options from 10 MHz to 50 MHz allow integration into 5G Radio Units, switches, routers, SyncE systems, IEEE 1588 timing equipment, AI servers, and timing cards. Modern product development increasingly integrates a dedicated ASIC for oscillator control and oven temperature regulation, reducing component count while improving thermal management.

Low-phase-noise PIN Shape development remains active for military, space, radar, and metrology applications. New products increasingly offer frequencies between approximately 10 MHz and 100 MHz with phase-noise floors approaching minus 170 dBc/Hz to minus 180 dBc/Hz. Manufacturers are also targeting lower power, with some larger precision units operating near approximately 0.3 W under steady-state conditions. Through 2035, product development is expected to emphasize at least 5 characteristics consisting of smaller size, lower power, wider temperature capability, reduced phase noise, and improved aging performance. Hybrid architectures combining OCXO stability with GNSS disciplining or network timing algorithms will further increase system-level accuracy.

Five Recent Developments

• March 2024: OCXO suppliers increased emphasis on approximately 7 mm by 5 mm SMD packages as telecommunications and compact network equipment required higher frequency stability without conventional large oven housings.
• May 2025: NDK announced compact NH7050XA and NH9070XB OCXOs measuring approximately 7.2 mm by 5.3 mm and 9.5 mm by 7.3 mm for 5G base stations and data centers.
• July 2025: Mass production began for NDK's new compact OCXO generation supporting frequencies between approximately 10 MHz and 50 MHz and high-temperature operation reaching 105 degrees Celsius.
• February 2026: Low-phase-noise OCXO portfolios expanded across SMD and PIN Shape designs, with selected precision products offering approximately minus 165 dBc/Hz to minus 180 dBc/Hz performance at higher offset frequencies.
• June 2026: OCXO development increasingly targeted AI servers, timing cards, routers, 5G Radio Units, and precision edge systems requiring around 0.5 W steady-state power and nanosecond-class synchronization support.

Report Coverage

The Oven Controlled Crystal Oscillator (OCXO) Market assessment covers industry conditions across the 2026-2035 forecast period and evaluates the 2 supplied product types and 4 supplied applications. Product segmentation includes SMD Shape with approximately 64% market share and PIN Shape with approximately 36%. Application analysis covers Telecom Infrastructure at approximately 46%, Military & Space at 27%, Industrial & Medical at 18%, and Other applications at 9%. Regional coverage includes North America, Europe, Asia-Pacific, Latin America, and the Middle East & Africa, with Asia-Pacific accounting for approximately 43% of current market activity and projected to expand at around 2.8% annually. Technical coverage includes approximately 10 MHz to 100 MHz frequency ranges, 7 mm-class SMD packages, phase noise below minus 150 dBc/Hz, operating temperatures reaching 105 degrees Celsius, temperature stability measured in parts per billion, and steady-state consumption around 0.5 W.

The competitive assessment covers the 3 supplied companies: Epson, NDK, and Abracon. Analysis evaluates SMD Shape, PIN Shape, Telecom Infrastructure, Military & Space, Industrial & Medical, quartz technology, low-phase-noise performance, thermal control, miniaturization, aging stability, and regional positioning. Current industry development includes approximately 64% SMD Shape leadership, Telecom Infrastructure demand near 46%, compact packages reaching approximately 7.2 mm by 5.3 mm, frequency ranges extending to 50 MHz in miniature designs and 100 MHz in larger precision models, temperature support reaching 105 degrees Celsius, and phase-noise performance approaching minus 180 dBc/Hz in selected PIN Shape products. The report also evaluates 5G synchronization, GNSS holdover, AI data centers, military timing, industrial instrumentation, high-temperature electronics, low-power design, and next-generation OCXO development through 2035.