ROF Thin-Film Lithium Niobate IQ Modulator

Name: ROF Thin-Film Lithium Niobate IQ Modulator
Brand: BEIJING ROFEA OPTOELECTRONICS CO,. LTD.
Availability: InStock

Description

Thin-Film Lithium Niobate IQ Modulator – ROF-TFLN-IQ Series

The ROF-TFLN-IQ series is a family of high‑performance thin‑film lithium niobate (TFLN) IQ modulators engineered for next‑generation coherent optical communication and microwave photonics. Built on advanced lithium niobate on insulator (LNOI) technology, these integrated modulators inherit the superior electro‑optic properties of bulk LiNbO₃ while delivering a dramatically smaller footprint, reduced drive voltage, and higher bandwidth. Compared with conventional bulk lithium niobate modulators commonly used in long‑haul and metro coherent systems, the ROF‑TFLN‑IQ platform offers lower insertion loss, higher modulation efficiency, and enhanced stability, making it an excellent choice for demanding high‑speed optical links and integrated photonic systems.

Optimized for operation in the C‑band (1530–1565 nm), the ROF‑TFLN‑IQ‑C‑20/40/60‑0PPS and ROF‑TFLN‑IQ‑C‑20‑0PPLV variants provide a 20 GHz or 40 GHz 3 dB electrical bandwidth, supporting advanced modulation formats such as QPSK and higher‑order QAM in coherent transceivers. A key advantage of the thin‑film platform is its low RF half‑wave voltage, with typical Vπ values down to 2.5–3.5 V at 50 kHz, enabling direct drive from modern high‑speed drivers and reducing overall system power. The integrated heater bias structure ensures stable quadrature operating point and precise phase control across a wide operating temperature range from −55 °C to +85 °C, which is critical for field‑deployed coherent systems and temperature‑variable laboratory environments.

From an optical perspective, these IQ modulators are designed to deliver stable, high‑contrast modulation with typical optical insertion loss ≤5.5–6 dB and an extinction ratio ≥25 dB, matching and often exceeding performance seen in many state‑of‑the‑art commercial TFLN and bulk LiNbO₃ IQ modulators. The devices support input optical powers up to 200 mW, allowing operation with high‑power narrow‑linewidth lasers and integrated amplifiers without compromising reliability. Low optical return loss (≤ −26 dB) reduces back‑reflection into the laser source, which is essential for achieving low phase noise and high‑OSNR coherent transmission. For seamless integration into existing fiber systems, the ROF‑TFLN‑IQ modules are supplied with PM1550 polarization‑maintaining input fiber and standard SM1550 single‑mode output fiber, both with typical lengths of 0.6 m, ensuring stable polarization handling at the input and compatibility with standard telecom infrastructure at the output.

Electrically, the modulators exhibit broadband S‑parameter performance with 20–40 GHz 3 dB bandwidth and RF return loss better than −10 dB, enabling efficient coupling to 50‑ohm RF drivers and minimizing reflections that can degrade high‑speed signals. The RF input power handling up to 23 dBm provides ample margin for intense modulation schemes and high symbol‑rate operation. Integrated heater bias control with half‑wave power levels around 30–50 mW and bias voltage below 8 V enables fine tuning of the operating point without significant additional power consumption, which is advantageous in dense photonic integration and data center settings where thermal budgets are tightly controlled.

In practical deployment, the compact TFLN chip and packaged module design allow dense integration in coherent transponders, test and measurement setups, and photonic research platforms. The small size and low drive voltage, combined with high bandwidth and robustness over a wide temperature range, make the ROF‑TFLN‑IQ series well suited for long‑distance coherent transmission, 400G/800G‑class and beyond coherent interfaces, microwave photonic links, and advanced modulation experiments in universities and research institutes. When compared with similar thin‑film lithium niobate IQ modulators available globally, the ROF‑TFLN‑IQ products stand out for their balance of bandwidth, insertion loss, extinction ratio, and operating stability, offering a competitive solution for both system integrators and photonic researchers seeking state‑of‑the‑art electro‑optic modulation technology.

Specifications

Aperture Diameter:	Not Specified
Peak Optical Power Density:	Not Specified
Wavelength Range:	1530 – 1565 nm
Transmission:	Not Specified
Extinction Ratio:	Not Specified
Operating Wavelength:	1530–1565 nm
Optical Insertion Loss (standard):	≤5.5 dB
Optical Insertion Loss (low Vπ Version):	≤6 dB
Optical Extinction Ratio:	≥25 dB
Optical Return Loss:	≤-26 dB
Optical Input Power:	≤200 mW
Bandwidth (3 DB, Standard):	20/40 GHz
Bandwidth (3 DB, Low Vπ Version):	20 GHz
RF Half-wave Voltage @ 50 KHz (standard):	≤3.5 V
RF Half-wave Voltage @ 50 KHz (low Vπ Version):	≤2.5 V
RF Return Loss:	≤-10 dB
RF Input Power:	≤23 dBm
Heater Bias Half-wave Power:	50(30) mW
Heater Bias Voltage:	<8 V
Operating Temperature:	-55 to +85 ℃
Storage Temperature:	-55 to +85 ℃
Input Fiber Type:	PM1550 polarization-maintaining fiber
Input Fiber Length:	0.6 m
Output Fiber Type:	SM1550 standard single-mode fiber
Output Fiber Length:	0.6 m
RF Port Connector:	1.85 mm female

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Features

Advanced Thin-Film LNOI Platform – Based on lithium niobate on insulator (LNOI), inheriting the excellent electro‑optic properties of bulk LiNbO₃ while enabling chip‑scale integration, compact footprint, and high modulation efficiency.
High‑Speed IQ Modulation for Coherent Systems – Integrated in‑phase and quadrature (IQ) structure optimized for advanced modulation formats (QPSK, 16QAM and beyond), ideal for long‑haul coherent optical communication and high‑capacity DWDM systems.
Wide 3 dB Electrical Bandwidth: 20 / 40 / 60 GHz – Supports 20 GHz and 40 GHz standard options (and higher bandwidth roadmap), enabling symbol rates compatible with 100G/200G/400G+ coherent links and broadband microwave‑photonic applications.
Low RF Half‑Wave Voltage (Vπ) – RF Vπ as low as ≤2.5–3.5 V @ 50 kHz (LV versions available), significantly reducing drive power and easing requirements on RF drivers and DAC electronics compared with traditional bulk LiNbO₃ modulators.
Low Optical Insertion Loss – Typical insertion loss ≤5.5–6 dB over 1530–1565 nm C‑band, minimizing system OSNR penalties and improving link budget in long‑distance and metro applications.
High Extinction Ratio and Excellent Modulation Quality – Extinction ratio ≥25 dB ensures clean on/off contrast, improved BER performance, and high fidelity for high‑order modulation formats in coherent detection schemes.
Optimized for C‑Band Operation – Operating wavelength range 1530–1565 nm, matching standard C‑band EDFA, transceiver, and coherent detection infrastructures used in modern optical networks.
Integrated Photodetector Option – Configurable with co‑packaged photodetector (PD = 1) for compact optical front‑end solutions, reduced footprint, and simplified alignment in coherent receivers and microwave‑photonic links.
Polarization‑Maintaining Input and Flexible Output Fiber – PM1550 polarization‑maintaining input fiber for stable polarization state (key at high baud rates); output available as PM or standard SM fiber for easy integration into existing fiber networks.
Excellent RF Performance and Matching – RF return loss S11 ≤ –10 dB with 1.85 mm RF input ports, ensuring low reflection, efficient RF power transfer, and stable high‑frequency operation up to 40 GHz and beyond.
High Optical and RF Power Handling – Supports optical input power up to 200 mW and RF input power up to 23 dBm, suitable for high‑power links, analog optical transmission, and linear microwave‑photonic systems.
Thermal Bias Control with Low Heater Power – Integrated heater with half‑wave power around 30–50 mW and bias voltage <8 V for stable quadrature biasing and drift compensation without excessive power consumption.
High Stability and Low Drift – Thin‑film LNOI design offers improved temperature stability and reduced bias drift over conventional bulk LiNbO₃ modulators, enhancing long‑term reliability in field deployments.
Rugged Wide Temperature Operation – Operating temperature range –55 to +85 °C (storage –55 to +85 °C), supporting demanding telecom, data‑center, industrial, and defense environments.
Compact, Integrated Package – Small‑size package with 0.6 m fiber pigtails and clearly defined pins (IN, OUT, RF1/2, heater) simplifies assembly on line cards and test benches, while supporting dense integration in coherent transceivers.
Low Return Loss and Reduced Back‑Reflection – Optical return loss ≤ –26 dB helps maintain signal integrity, protects upstream lasers, and reduces penalties in coherent and analog systems.
Ideal for Microwave Photonics and RF‑over‑Fiber – High linearity, broad bandwidth, and low Vπ make the device well‑suited for analog photonic links, phased‑array radar, 5G/6G fronthaul, satellite communications, and other RF‑over‑fiber applications.
Future‑Proof Platform – Thin‑film LNOI technology is compatible with photonic integrated circuit (PIC) processes, supporting future evolution toward higher baud rates, higher‑order modulation formats, and more complex integrated photonic systems.

Applications

High‑speed coherent optical communication systems – IQ modulation for 100G/200G/400G/800G coherent transponders and coherent pluggable modules in data center interconnect (DCI), metro, long‑haul, and submarine links.
Advanced modulation format generation – Creation of QPSK, 8QAM, 16QAM, and higher‑order QAM constellations in testbeds, enabling research and deployment of spectrally efficient coherent formats.
Optical transmitters for DWDM systems – Integration in dense wavelength‑division multiplexing transmitters for flexible grid networks, ROADMs, and colorless, directionless, contentionless (CDC) architectures.
Microwave photonics links – Low‑Vπ, broadband electro‑optic conversion for analog optical links, RF‑over‑fiber, and distribution of high‑frequency microwave and millimeter‑wave signals.
5G/6G fronthaul and backhaul – Transport of high‑bandwidth CPRI/eCPRI and radio‑over‑fiber signals between centralized baseband units and remote radio heads in advanced mobile networks.
Photonics‑enabled radar and electronic warfare – Linear, broadband modulation for radar front‑ends, phased‑array beamforming networks, and low‑probability‑of‑intercept (LPI) RF systems.
Optical arbitrary waveform generation (OAWG) – Fine control of amplitude and phase to synthesize complex optical waveforms for spectroscopy, advanced metrology, and coherent control experiments.
High‑speed optical signal processing – IQ modulation for optical mixing, frequency translation, optical filtering, and all‑optical signal conditioning in fiber‑optic signal processing chains.
Coherent LIDAR and ranging systems – Phase‑stable modulation for frequency‑modulated continuous‑wave (FMCW) LIDAR, coherent Doppler ranging, and high‑resolution distance/velocity measurement.
High‑purity microwave generation from optics – Optical heterodyne and frequency comb applications where low‑noise, linear phase modulation is required to generate ultra‑low‑phase‑noise RF signals.
Quantum key distribution (QKD) and quantum communications – Precise amplitude/phase control in continuous‑variable and discrete‑variable QKD transmitters operating around 1550 nm.
Integrated photonic research on LNOI platforms – Use as a reference LNOI IQ modulator in academic and industrial R&D for integrated LiNbO3 photonics, including chip‑to‑fiber interfacing and hybrid integration.
Optical coherent detection test and measurement – Generation of well‑defined test signals for coherent receiver characterization, EVM measurements, and performance benchmarking of coherent DSP algorithms.
High‑speed bit‑error‑rate (BER) and system testing – IQ modulation of PRBS patterns up to tens of GHz symbol rates for validating line cards, EDFAs, ROADMs, and complete optical links.
Educational and demonstration platforms – Laboratory use in universities and training centers to demonstrate principles of coherent communications, complex modulation formats, and microwave photonics.
Secure and encrypted optical links – Complex phase and amplitude modulation to support advanced optical layer encryption and spreading techniques in high‑security communication systems.
Optical frequency comb shaping – Amplitude and phase shaping of comb lines for telecommunications superchannels, dual‑comb spectroscopy, and optical frequency metrology.
Reconfigurable optical transceivers – Use in software‑defined transmitters where modulation format, baud rate, and spectral occupancy can be dynamically adapted via the IQ modulator.
Low‑latency data center interconnects – Integration in short‑reach and medium‑reach coherent DCI links that require compact, low‑power, low‑latency modulators with high stability.
Optical sensing and interferometry – Stable phase modulation for fiber‑optic interferometers, distributed acoustic sensing (DAS), and coherent optical sensors requiring high extinction ratio and low insertion loss.

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Frequently Asked Questions

What is the ROF‑TFLN‑IQ thin‑film lithium niobate IQ modulator and what are its key features?

The ROF‑TFLN‑IQ‑λ‑BW‑PD‑IF‑OF‑S/LV/DP is an integrated thin‑film lithium niobate (LNOI) in‑phase and quadrature (IQ) electro‑optic modulator designed for high‑speed coherent optical communication and microwave photonics. Compared with traditional bulk LiNbO3 modulators from vendors such as Fujitsu, Sumitomo, and iXblue (Exail), this device offers: (1) High electrical bandwidth of 20 or 40 GHz (3 dB), suitable for 100G–400G class coherent links and advanced analog photonic systems; (2) Low half‑wave voltage (Vπ ≤ 3.5 V, and ≤ 2.5 V for LV versions) for reduced drive power and easier compatibility with CMOS or InP drivers; (3) Low optical insertion loss (typically ≤ 5.5–6 dB) and high extinction ratio (≥ 25 dB) for better link budget; (4) Compact, small‑footprint LNOI platform for easier integration into photonic circuits; (5) High stability and broad operating temperature range (‑55 to +85 °C) to support demanding telecom, datacenter, and defense environments. Its performance is comparable to other modern TFLN IQ modulators found on the market while offering a robust power handling capability up to 200 mW optical input.

What are the operating wavelength range, bandwidth options, and typical applications of this TFLN IQ modulator?

The ROF‑TFLN‑IQ series is optimized for the C‑band with an operating wavelength range of 1530–1565 nm, which is standard for coherent DWDM and long‑haul optical communication. The 3 dB electrical bandwidth options are 20 GHz and 40 GHz, similar to other high‑speed IQ modulators offered on FindLight and by leading photonics vendors. The 20 GHz version is suitable for 100G coherent and many analog RF‑over‑fiber systems, while the 40 GHz version supports higher symbol‑rate formats (e.g., 32–64 GBaud class modulation) used in 200G/400G coherent transport and broadband microwave photonics. The main applications include long‑distance coherent fiber‑optic communication, high‑speed metro and data center interconnects, microwave photonics (RF‑over‑fiber links, phased‑array radar, and arbitrary waveform generation), and test & measurement setups where wideband phase and amplitude control of an optical carrier are required.

What is the difference between the standard and low‑Vπ (LV) versions of the ROF‑TFLN‑IQ modulators?

The ROF‑TFLN‑IQ family includes standard versions (S) and low half‑wave‑voltage versions (LV). Both share the same thin‑film LNOI platform, wavelength range (1530–1565 nm), and general package style, but they are optimized differently: (1) Standard versions (e.g., ROF‑TFLN‑IQ‑C‑20/40‑0PPS) provide low insertion loss (≤ 5.5 dB) with RF half‑wave voltage Vπ ≤ 3.5 V at 50 kHz, balancing drive voltage and optical loss—suitable for line‑card implementations where RF driver headroom is sufficient. (2) Low‑Vπ versions (e.g., ROF‑TFLN‑IQ‑C‑20‑0PPLV) further reduce the RF half‑wave voltage to ≤ 2.5 V, easing interface with lower‑swing CMOS/SiGe drivers and reducing overall power consumption. This LV optimization typically comes with a slightly higher specified insertion loss (≤ 6 dB), which is a common trade‑off observed across similar low‑Vπ modulators from other manufacturers. Users should choose the S or LV variant depending on whether minimizing RF drive voltage or minimizing optical loss is more critical for their link budget and system design.

How do I interpret the ordering code ROF‑TFLN‑IQ‑λ‑BW‑PD‑IF‑OF‑S/LV/DP and choose the right configuration?

The product code encodes the main configuration parameters: (1) λ – Operating wavelength window; for telecom C‑band devices, this appears as “C” and corresponds to 1530–1565 nm. (2) BW – 3 dB electrical bandwidth: 20 for 20 GHz, 40 for 40 GHz (and similar to 60 GHz options referenced in some series). Choose based on your target symbol rate and RF content. (3) PD – Photodetector integration flag: 1 for integrated monitor photodetector, 0 for no PD. A built‑in PD is useful for bias control and power monitoring, common in coherent line cards and found on competing devices. (4) IF – Input fiber type: typically P for polarization‑maintaining (PM1550) fiber to maintain a stable input state of polarization. (5) OF – Output fiber type: P for polarization‑maintaining or S for standard single‑mode (SMF‑28 class) fiber, depending on whether you need polarization preservation at the output. (6) S/LV/DP – Device characteristics: S for standard Vπ, LV for low half‑wave‑voltage optimization, and DP if a dual‑polarization configuration is offered. By combining these fields, you can specify, for example, a 1550 nm, 40 GHz, PM‑in/SM‑out, low‑Vπ coherent IQ modulator with or without integrated photodetector, similar to configuration options seen across other high‑end TFLN and LiNbO3 IQ modulators in the market.

What are the electrical drive requirements, including Vπ, RF power, and impedance matching, for the ROF‑TFLN‑IQ modulators?

The ROF‑TFLN‑IQ series is designed for standard 50‑ohm RF environments common in optical transmitters and RF labs. Key parameters are: (1) RF half‑wave voltage Vπ: ≤ 3.5 V for standard versions and ≤ 2.5 V for LV versions at 50 kHz, in line with other state‑of‑the‑art TFLN modulators and significantly lower than many legacy bulk LiNbO3 IQ modulators. Lower Vπ means you can achieve full π‑phase modulation with lower RF voltage swing, reducing driver complexity and power. (2) RF input power: maximum recommended RF input is ≤ 23 dBm, which matches typical high‑frequency driver capabilities and comparable products on FindLight. Operating near this limit should be done with care to avoid overheating and ensure linearity. (3) RF return loss S11: specified as ≤ ‑10 dB across the working band, which indicates acceptable impedance matching for 20–40 GHz and minimizes reflection‑related distortions. (4) Ports and connectors: RF1/2 are 1.85 mm female connectors (compatible with V‑connector type) for high‑frequency operation. Use high‑quality, low‑loss RF cables and ensure proper termination at all ports. Observing these conditions ensures you achieve the specified bandwidth and linearity while protecting the device from over‑drive, similarly to best practices recommended by other LiNbO3 and TFLN modulator vendors.

What optical power handling, losses, and extinction ratio should I expect, and how does this affect system design?

The ROF‑TFLN‑IQ modulators are specified for an optical input power Pin up to 200 mW, which is relatively high for integrated TFLN devices and comparable to robust LiNbO3 modulators used in long‑haul systems. Key optical parameters are: (1) Insertion loss: ≤ 5.5 dB for standard 20/40 GHz versions and ≤ 6 dB for low‑Vπ variants. This includes waveguide, coupling, and fiber pigtail losses. In coherent systems, this loss must be factored into the link budget along with transmitter and LO powers. (2) Extinction ratio (ER): ≥ 25 dB, which is consistent with high‑quality IQ modulators from other suppliers and helps ensure clean constellation points and reduced residual amplitude modulation in QPSK/16QAM formats. (3) Return loss (RL): ≤ ‑26 dB, indicating low back‑reflection at the optical ports, which minimizes coherent interference and is compatible with narrow‑linewidth lasers. In system design, the combination of relatively low insertion loss, high ER, and good return loss supports high OSNR and robust performance even in long‑distance coherent links. When comparing with other devices, these parameters place the ROF‑TFLN‑IQ series in the high‑performance category of C‑band TFLN IQ modulators.

What are the thermal, bias, and packaging considerations for reliable operation of the ROF‑TFLN‑IQ modulator?

For stable and long‑term operation, several practical aspects should be considered: (1) Temperature range: both operating and storage temperatures are specified from ‑55 °C to +85 °C, which is wider than many lab‑grade components and suitable for telecom and defense environments. Despite this wide range, for minimal drift in bias and performance, many users operate TFLN and LiNbO3 modulators near room temperature with local temperature control. (2) Heater bias: the device includes an internal heater for bias control, with half‑wave heater power Pπ around 50 (30) mW and heater voltage < 8 V. This is used to set and stabilize the quadrature bias point of the IQ modulator, similar to bias‑control schemes on other commercial IQ modulators. Use a low‑noise current or voltage source and, when possible, an automatic bias controller referencing the integrated photodetector (if PD = 1). (3) Packaging and fibers: input fiber (IN) is PM1550 polarization‑maintaining (0.6 m), while the output (OUT) is typically SM1550 single‑mode fiber (0.6 m), with options for PM output depending on the code. Proper polarization alignment at the IN port is crucial; misalignment is one of the most common causes of sub‑optimal ER across all LiNbO3‑based devices. (4) RF connectors: RF1/2 are 1.85 mm female connectors suitable for up to 40 GHz; handle them carefully to avoid damage and maintain bandwidth. By following these practices, you can achieve stable, low‑drift operation comparable to other leading thin‑film LiNbO3 IQ modulators in the market.

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