Rofea AM LiNbO3 Intensity Modulator, 850–1550 nm

Name: Rofea LiNbO3 AM Series Intensity Modulator 850nm to 1550nm 20GHz
Brand: BEIJING ROFEA OPTOELECTRONICS CO,. LTD.

Description

R-AM Series LiNbO3 Intensity Modulators – High‑Performance Integrated LN Modulators

The R-AM Series LiNbO3 (lithium niobate) intensity modulators from Beijing Rofea Optoelectronics are designed for demanding high‑speed optical applications where signal fidelity, low drive voltage, and long‑term stability are essential. Based on a Mach–Zehnder (MZ) push‑pull structure and X‑cut LiNbO3 design, these integrated modulators deliver excellent electro‑optic performance, making them a strong choice for modern fiber‑optic communication links, laser sensing platforms, and radio‑over‑fiber (RoF) distribution systems. Similar to other high‑end LiNbO3 modulators used in advanced telecom and photonics labs, the R-AM family is engineered to provide consistent modulation characteristics over a wide optical wavelength and electrical bandwidth range.

Covering key telecom and specialty wavelengths, the R-AM series supports operation around 850 nm, 1060 nm, 1310 nm, and 1550 nm. This versatility allows system designers to integrate the same modulation architecture into short‑wavelength free‑space or sensing systems as well as long‑haul and metro fiber‑optic links. Typical 3 dB electrical bandwidths start at approximately 10 GHz for most wavelength options, with versions reaching up to 20 GHz and above for higher‑speed formats. At 850 nm, for example, the R‑AM‑08‑10G model offers a typical operating range from 830 nm to 870 nm with a 10–12 GHz electrical bandwidth, enabling high‑speed digital modulation as well as precise analog and sub‑carrier modulation schemes.

The series is optimized for low insertion loss and strong extinction performance. For most configurations, insertion loss is typically below 5 dB, while extinction ratios exceed 20 dB at DC, ensuring clean on/off modulation and high optical contrast. In practical high‑speed use, the dynamic extinction ratio remains suitable for advanced modulation formats and sideband generation. The combination of low optical loss and high extinction makes these modulators appropriate for systems where link budget and signal integrity are critical, such as quantum key distribution setups and coherent detection test beds often found in cutting‑edge photonics research and industry evaluation labs.

A key strength of the R-AM LiNbO3 modulators is their low half‑wave voltage (Vπ). Depending on wavelength and bandwidth option, the RF Vπ at 1 kHz is typically in the range of about 2.5 V to 6 V, with the 850 nm 10 GHz version offering around 2.5–3 V. This low drive requirement reduces the burden on RF driver electronics, minimizes overall system power consumption, and facilitates integration into compact, high‑density modules. Bias Vπ values are similarly optimized, simplifying bias control for maintaining the desired operating point (such as quadrature). For many applications, this translates into more stable operation and easier long‑term calibration compared to modulators with higher drive voltages.

Fiber connectivity and mechanical design are tailored for practical deployment in both laboratory and industrial environments. The R‑AM‑08‑10G model, for instance, uses 850 nm polarization‑maintaining (PM) fiber at the input and output (125/250 μm), with standard FC/PC or FC/APC interfaces, and other connector options available on request. Similar flexibility is provided across the series, with combinations of PM–PM, PM–SMF, or fully customized fiber pigtails to match specific system architectures. The RF input is matched to 50 Ω and provided through an SMA female connector, while an independent bias port with high input impedance (on the order of 1 MΩ) allows fine control of the operating point using external bias controllers or driver boards.

From an electrical standpoint, the modulators are engineered to work seamlessly with typical RF signal chains used in photonics. Electrical return loss is specified to offer reliable impedance matching in the GHz regime, enabling stable broadband operation with minimal reflections when properly integrated into a 50 Ω environment. Maximum input optical power and RF power ratings are defined to protect the device against overload, and recommended bias voltage limits support safe operation in dynamic modulation scenarios. These characteristics position the R-AM family alongside other globally recognized LiNbO3 modulators that are widely used in coherent communication, microwave photonics, and precision measurement systems.

Environmental robustness is another important aspect of the R-AM design. Typical operating temperature ranges span from sub‑zero to elevated ambient temperatures, and the devices are qualified for extended storage temperature and humidity conditions. This makes the modulators suitable not only for benchtop R&D use, but also for deployment in field systems, production test setups, and industrial or telecom racks where temperature and humidity can vary over time.

Specifications

Aperture Diameter:	Not Specified
Peak Optical Power Density:	Not Specified
Wavelength Range:	830 – 1550 nm
Transmission:	Not Specified
Extinction Ratio:	Not Specified
Model:	R-AM-08-10G
Type:	Intensity modulator
Operating Wavelength (range):	830–870 nm
Operating Wavelength (center):	850 nm
3 DB Bandwidth (optical/electrical):	10–12 GHz
Insertion Loss:	4.5–5 dB
Optical Return Loss:	-45 dB
Switch Extinction Ratio @ DC:	20 dB
Dynamic Extinction Ratio:	13 dB
Input Fiber Type:	850 nm PM fiber (125/250 μm)
Output Fiber Type:	850 nm PM fiber (125/250 μm)
Optical Connector:	FC/PC, FC/APC or customization
Half-wave Voltage Vπ RF @ 1 KHz:	2.5–3 V
Half-wave Voltage Vπ Bias @ 1 KHz:	3–4 V
Electrical Return Loss S11:	-12 to -10 dB
RF Input Impedance ZRF:	50 Ω
Bias Input Impedance ZBIAS:	1 MΩ
Electrical Interface:	SMA (female)
Maximum Input Optical Power @ 850 Nm:	10 dBm
Maximum Input RF Power:	28 dBm
Bias Voltage Range:	-15 to +15 V
Operating Temperature Range:	-10 to +60 ℃
Storage Temperature Range:	-40 to +85 ℃
Humidity (non-condensing):	5–90 %RH
Optical Input Port:	PM fiber (125 μm/250 μm)
Optical Output Port:	PM and SMF option
RF Port:	RF input port, SMA (female)
Bias Port:	Bias control port, pins 1–2 Bias, 3–4 N/C

Got questions about specs? Use the inquiry form to ask.

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Features

Wide Wavelength Coverage – Supports multiple telecom and specialty bands, including 850 nm, 1064 nm, 1310 nm, and 1550 nm, suitable for data‑com, sensing, and RF-over-fiber links.
High Modulation Bandwidth – Up to 10 GHz 3 dB bandwidth for 850/1064/1310/1550 nm versions and up to 20 GHz (and higher options like 28 GHz) at 1550 nm for advanced high‑speed modulation formats.
Low Insertion Loss – Typical insertion loss < 5 dB, minimizing link budget penalty and preserving optical signal-to-noise ratio in long‑haul and short‑reach systems.
High Extinction Ratio – DC extinction ratio up to > 23 dB (typical > 20 dB at 850 nm), enabling clean on/off keying, high dynamic range, and deep intensity modulation for demanding communication and sensing applications.
Low Half-Wave Voltage (Vπ) – Low drive voltage with Vπ,RF as low as ~2.5–3 V at 1 kHz (850 nm type) and typically < 6 V across other wavelengths, reducing RF driver power requirements and system cost.
MZ Push–Pull Design – Mach–Zehnder push–pull electrode structure on X‑cut LiNbO3 provides high linearity, improved modulation efficiency, and excellent chirp control compared to single‑arm designs.
Stable LiNbO3 Platform – Built on X‑cut lithium niobate with proven electro‑optic performance, providing long‑term physical and chemical stability for both laboratory and industrial environments.
Polarization-Maintaining Fiber Integration – Input and output ports with PM fiber (125/250 μm) for 850 nm and other bands ensure polarization stability and repeatable modulation performance; SMF output options available where required.
Low Optical Return Loss – ORL typically < −45 dB reduces back‑reflections into lasers and upstream components, improving source stability and overall link performance.
Good Electrical Matching – 50 Ω RF input with SMA(f) connector and well‑controlled S11 (≈ −10 to −12 dB) for efficient RF power transfer over multi‑GHz frequencies.
Bias Port for DC Control – Dedicated bias input (high‑impedance, ~1 MΩ) enables precise operating point control (null, quadrature, or max) and compatibility with external automatic bias controllers.
RF Power Handling – Supports RF input powers up to about +28 dBm (model‑dependent), suitable for strong modulation depth and wideband analog links such as RF-over-fiber.
Compact and Robust Package – Integrated fiber pigtails and electrical ports in a compact housing with clear In / Out / RF / Bias labels, simplifying installation in optical benches, 19" racks, and OEM subsystems.
Industrial-Grade Environmental Performance – Wide operating temperature range from −10 °C to +60 °C and storage from −40 °C to +85 °C with 5–90% RH humidity tolerance for reliable field deployment.
Multiple Connector Options – Available with FC/PC, FC/APC and customized optical connector types to match existing fiber infrastructure and minimize back‑reflection in coherent or narrow‑linewidth laser systems.
Optimized for Digital and Analog Modulation – Suitable for NRZ, PAM, and advanced modulation formats as well as high‑linearity analog modulation for CATV, microwave photonics, and test & measurement setups.
Ideal for RF-over-Fiber Systems – High bandwidth, low Vπ, and good linearity make the R‑AM series a strong choice for RF-over-fiber (RoF), 5G fronthaul, satellite ground stations, and distributed antenna systems.
Quantum & Sensing Ready – High extinction ratio and stable polarization handling support applications in quantum key distribution (QKD), lidar, interferometric sensing, and precision laser modulation.
Sideband and Optical Carrier Suppression Modulation – Accurate phase and intensity control enable single-sideband (SSB) generation, optical carrier suppression, and frequency comb applications in advanced photonic systems.
Flexible Customization Options – Customizable in terms of wavelength (850/1064/1310/1550 nm), bandwidth (300 MHz to 20+ GHz), fiber type (PM/SMF), connectors, and packaging to match specific OEM or research requirements.

Applications

High‑speed fiber‑optic communication links – Use as an external LiNbO₃ Mach‑Zehnder intensity modulator for generating high‑fidelity on–off keyed (OOK), DPSK, and advanced modulation formats in 850 nm, 1064 nm, 1310 nm, and 1550 nm fiber‑optic links.
Radio‑over‑fiber (RoF) and microwave photonics – Transport RF and microwave signals over optical fiber by intensity‑modulating the optical carrier with analog or digital RF signals up to 10–20 GHz, enabling low‑loss distribution of wireless, radar, CATV, and 5G/6G test signals.
Quantum key distribution (QKD) transmitters – Implement high‑extinction‑ratio amplitude modulation for decoy‑state generation, pulse‑pattern encoding, and intensity control in 1310 nm and 1550 nm QKD systems and quantum communication testbeds.
Lidar and laser ranging systems – Generate precisely shaped optical pulses (short, high‑contrast bursts) for time‑of‑flight lidar, 3D imaging, and long‑range distance measurement at 850 nm, 1064 nm, 1310 nm, and 1550 nm.
Coherent optical transmission and test – Use as an external modulator in coherent transmitters for amplitude control, pilot tone insertion, and test signal generation in 100G/400G+ coherent communication systems.
Optical arbitrary waveform generation – Combine with RF waveform generators to synthesize complex temporal optical intensity profiles for photonic signal processing and ultrafast optics research.
Optical pulse carving and pulse picking – Carve short pulses from CW or mode‑locked lasers and perform pulse picking from high‑repetition‑rate pulse trains, enabling repetition‑rate reduction and timing control in ultrafast laser setups.
Amplitude modulation for mode‑locked lasers – Stabilize or gate mode‑locked sources by high‑speed amplitude modulation, supporting laser synchronization, pump–probe experiments, and frequency‑comb manipulation.
Sideband and subcarrier modulation – Realize controlled intensity modulation for optical double‑sideband (DSB), single‑sideband (SSB) with filtering, and subcarrier multiplexing schemes in advanced microwave‑photonic links.
Analog optical links and CATV distribution – Implement linear, low‑distortion intensity modulation in analog fiber links used in cable television (CATV), antenna remoting, and instrumentation systems.
Optical sensors and interferometric measurement – Use as a high‑speed, low‑drift amplitude modulator in fiber interferometers, optical gyros, and distributed sensing systems to control probe power, perform phase‑to‑intensity conversion, or implement lock‑in detection schemes.
Laser sensing and spectroscopy – Perform intensity modulation for pump–probe spectroscopy, absorption spectroscopy, and photoacoustic excitation by modulating CW or pulsed lasers at RF/ GHz rates for high signal‑to‑noise detection.
Secure optical links and optical encryption – Apply fast, programmable intensity patterns to optical carriers for physical‑layer encryption, secure key distribution, and spread‑spectrum optical communication.
Test and measurement equipment – Integrate into optical test benches as a calibrated, broadband intensity modulator for characterizing photodetectors, receivers, amplifiers, and RF‑over‑fiber components up to 10–20 GHz.
Optical clock distribution and timing systems – Modulate amplitude of timing pulses or CW carriers in precision timing and synchronization networks, including photonic clock distribution over fiber.
Educational and research laboratories – Use as a versatile, easy‑to‑drive LiNbO₃ MZ modulator platform for demonstrations of electro‑optic effects, digital/analog modulation formats, interferometry, and high‑speed optical communication in universities and R&D labs.
Optical packet and burst switching experiments – Perform fast on–off gating of data bursts and optical packets in experimental optical switching and data‑center interconnect architectures.
Free‑space optical communication (FSO) – Generate intensity‑modulated optical carriers in 850 nm and 1550 nm free‑space links, enabling high‑speed, eye‑safe terrestrial or airborne communication channels.
Photonic integration prototyping – Serve as an external benchmark modulator when developing or characterizing integrated photonic transmitters, providing a well‑known reference for performance comparison.

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Frequently Asked Questions

What is the R-AM series LiNbO3 intensity modulator and what applications is it designed for?

The R-AM series is a family of integrated lithium niobate (LiNbO3) Mach–Zehnder (MZ) intensity modulators from Beijing Rofea Optoelectronics. They use an X-cut, push–pull design to provide low half-wave voltage (Vπ), low insertion loss, and high extinction ratio for high‑speed optical modulation. Typical operating wavelengths are 850 nm, 1064 nm, 1310 nm, and 1550 nm with bandwidths up to 20 GHz (and options up to 28 GHz for certain 40G configurations). These intensity modulators are used in: - Radio-over-fiber (RoF) links - High‑speed fiber‑optic communication systems (NRZ, OOK, DPSK, external modulation) - Quantum key distribution (QKD) setups - Laser sensing and LIDAR systems - Sideband modulation and optical single-sideband (OSSB) generation - Laboratory research and industrial test platforms requiring stable, low-drift modulation at telecom and NIR wavelengths.

What are the key optical and electrical specifications of the R-AM-08-10G 850 nm intensity modulator?

The R-AM-08-10G is an 850 nm LiNbO3 intensity modulator with 10 GHz bandwidth, optimized for short‑wavelength high‑speed links and sensing. Its main specifications are: Optical: - Operating wavelength range: 830–870 nm (centered at 850 nm) - 3 dB bandwidth: 10–12 GHz - Insertion loss: typically 4.5 dB, max 5 dB - Static (DC) extinction ratio: ≥ 20 dB (spec sheet), with dynamic extinction ratio around 13 dB - Optical return loss: ≤ –45 dB - Input/output fiber: 850 nm polarization‑maintaining (PM) fiber, 125/250 μm - Connectors: FC/PC or FC/APC as standard; other interfaces available on request Electrical: - Half‑wave voltage Vπ (RF @ 1 kHz): 2.5–3 V - Bias voltage Vπ (DC @ 1 kHz): 3–4 V - RF input impedance: 50 Ω - Bias input impedance: ~1 MΩ - Electrical return loss (S11): better than –10 dB over the operating band - RF connector: SMA (female) Limits and environment: - Max input optical power at 850 nm: +10 dBm - Max RF input power: 28 dBm - Bias voltage range: –15 V to +15 V - Operating temperature: –10 °C to +60 °C - Storage temperature: –40 °C to +85 °C, 5–90% RH non‑condensing These values are consistent with similar commercial LiNbO3 intensity modulators used at 850 nm for 10 Gbit/s and RoF applications.

How do I correctly bias and drive the R-AM LiNbO3 intensity modulator for optimal performance?

The R-AM series modulators are Mach–Zehnder interferometers that must be properly biased and RF‑driven: 1. Bias point setting: - Connect the bias port to a low‑noise DC supply or to an automatic bias controller (ABC) if your application requires long‑term stability. - Typical bias Vπ is in the 3–7 V range depending on wavelength (e.g., 3–4 V for R‑AM‑08‑10G at 850 nm). For linear operation, set the bias around quadrature (midpoint between maximum and minimum transmission). - Do not exceed the specified bias range (–15 V to +15 V in the R‑AM‑08‑10G datasheet). 2. RF drive: - Use a 50 Ω RF source and matched coax cable; connect to the SMA (f) RF port. - Respect the maximum RF input power (28 dBm). Driving above this may damage the electrodes. - To achieve a π phase shift (full on–off modulation) at low frequency, aim for a drive amplitude around Vπ (e.g., ~3 Vpp at 1 kHz for R‑AM‑08‑10G). At multi‑GHz speeds, required RF power will also depend on your driver’s output impedance and line losses. 3. Fiber polarization and alignment: - Use polarization‑maintaining (PM) input fiber aligned to the modulator’s principal axis; for best extinction ratio, ensure the launched polarization stays stable (PANDA or equivalent PM fiber recommended). 4. Thermal and long‑term stability: - For high‑precision or QKD/sensing uses, consider active bias control. Rofea provides an RF driver and bias control board; similar commercial ABCs used for LiNbO3 modulators are compatible as long as they match the voltage range and connector. With correct biasing and 50 Ω RF drive, the device will provide the specified extinction ratio and linearity over the quoted bandwidth.

How do I select the right R-AM intensity modulator configuration (wavelength, bandwidth, and fiber type) for my application?

Selection depends primarily on wavelength, data rate / RF frequency, and fiber type: 1. Wavelength: - 850 nm (R‑AM‑08‑xx): Short‑reach multimode or specialty PM fiber systems, VCSEL‑based links, sensing, and some quantum/atomic experiments. - 1064 nm (R‑AM‑10‑xx): YAG lasers, frequency‑doubled systems, and interferometric sensing. - 1310 nm (R‑AM‑13‑xx): Low‑dispersion O‑band telecom links, datacom, and test systems. - 1550 nm (R‑AM‑15‑xx): Long‑haul telecom C‑band, QKD, coherent systems, and RoF; highest maturity and component availability. 2. Bandwidth (3 dB): - 2.5G / 300 MHz–2.5 GHz: Lower rate links, analog sensing, or where cost and lower drive voltage matter more than very high speed. - 10G / 10 GHz: 10 Gbit/s NRZ, many microwave photonics and RoF applications. - 20G / 20 GHz and up to 28 GHz (40G option): 20–40 Gbit/s, advanced modulation formats, and broadband analog/RoF work. 3. Fiber type and connectors: - In–out PM/PM (PP): For polarization‑sensitive applications, QKD, coherent detection, and where high extinction ratio is critical. - PM/SMF (PS or SP): For mixing PM at input and standard SMF at output, useful when the downstream system is not polarization‑maintaining. - Connectors: FC/APC (FA) is preferred for low back reflection; FC/PC (FP) suits many lab setups. Custom connectors (e.g., SC, LC pigtails) are often available on request. Use the ordering code R‑AM–[wavelength]–[bandwidth]–[fiber type]–[connector] (e.g., R‑AM‑15‑20G‑PP‑FA) and contact Rofea if you need non‑standard bandwidths or fibers; custom options are explicitly supported.

What are the maximum input optical power, RF power, and environmental conditions for safe operation?

For safe and reliable operation, follow these limits (R‑AM‑08‑10G as reference; other wavelengths are comparable in class): - Maximum input optical power: +10 dBm at 850 nm. Operating close to this level is acceptable in telecom‑grade LiNbO3 devices but avoid sustained over‑power or strong back‑reflections. - Maximum RF input power: 28 dBm into 50 Ω. Do not exceed this, especially at high duty cycles, to prevent electrode overheating or damage. - Bias voltage: –15 V to +15 V allowed on the bias port. - Operating temperature: –10 °C to +60 °C. - Storage temperature: –40 °C to +85 °C. - Relative humidity: 5–90% (non‑condensing). Similar LiNbO3 modulators from other manufacturers operate in essentially the same ranges. If you need higher optical power handling (e.g., for pulsed high‑peak‑power lasers), check with Rofea for device‑specific derating and potential AR‑coating or packaging variants.

How do I interpret the extinction ratio (ER) and insertion loss specifications, and what do they mean for system performance?

Insertion loss and extinction ratio define how effectively the modulator transfers and suppresses optical power: - Insertion loss (IL): For R‑AM‑08‑10G, typical IL is 4.5 dB (max 5 dB). This includes waveguide loss, coupling loss, and pigtail/connectors. In a system link budget, subtract this IL from your laser output to estimate received power. - Static extinction ratio (ER @ DC): ≥ 20–23 dB is specified for R-AM series at DC. This is the ratio between transmitted power in the ON and OFF states with slowly varying drive. Higher ER allows deeper modulation and better on–off keying and sideband suppression. - Dynamic extinction ratio (DER): Around 13 dB is typical at high speed (multi‑GHz). It indicates the effective on/off contrast under realistic RF drive and bandwidth limits. Other vendors of LiNbO3 MZ modulators show similar behavior: dynamic ER is always lower than the static ER due to electrical bandwidth, drive amplitude, and waveform shape. System impact: - Higher ER improves extinction in digital links (lower residual light in logical “0”) and improves carrier or sideband suppression in analog/RoF and QKD setups. - IL directly reduces optical SNR; ensure your source power and receiver sensitivity can accommodate the specified IL plus any additional fiber/connector losses. For best ER, maintain proper PM fiber alignment, stable polarization, and correct bias at or near the null/quadrature point.

What accessories or external circuits are recommended for using the R-AM series, and where can I find integration support?

For robust deployment, you typically need: - RF driver / amplifier: A broadband 50 Ω RF driver that can deliver the required Vπ and desired modulation format at your target frequency (up to 10–20 GHz, or 28 GHz for some models). Rofea offers an RF driver and bias control circuit board specifically designed for their LiNbO3 modulators. - Bias control electronics: For stable operation, especially in QKD, sensing, or long‑term telecom tests, use a bias controller (automatic bias control, dither‑based or pilot‑tone) to lock the modulator at quadrature or at the extinction point. - Polarization‑maintaining patch cords and isolators: To preserve polarization and reduce back‑reflection into your laser source, use PM patch cords and, where necessary, optical isolators and attenuators. - Connectors and mounting: Ensure secure fiber management and RF cabling; standard SMA connectors and FC/PC or FC/APC interfaces are used, making integration straightforward with common laboratory and telecom equipment. Detailed RF driver and bias board information is available on the Beijing Rofea Optoelectronics website (www.bjrofoc.com). You can also request application notes, S‑parameter data (S21 and S11 curves), and mechanical drawings via email (bjrofoc@rof-oc.com) or WhatsApp (+86‑18978968297), similar to the support commonly provided with other LiNbO3 intensity modulators on the market.

Got more questions? Use the inquiry form to ask the supplier directly.