FRM Faraday Reflector Mirrors
Kernstech's 532nm/633nm Circulator is a high-performance optical device used to control the direction of light within fiber optic systems. With a center wavelength of 532nm and 633nm, this circulator is ideal for use in a range of applications such as fiber amplifiers, fiber sensors, and medical devices. The product is designed to minimize insertion loss, provide high return loss, and ensure robust isolation, ensuring consistent signal integrity. Its polarization-insensitive nature makes it suitable for diverse environments, ensuring stable operation in both standard and advanced systems.
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Product Description
| Parameter | Spec | Unit | |
| Port Type | 3 Port | / | |
| Center Wavelength | 532,633 | nm | |
| Operating Wavelength Range | ±5 | nm | |
| Typ.Peak Isolation @23℃ | 22 | dB | |
| Min.Isolation @23℃ | 20 | dB | |
| Typical Insert loss@23℃ | 1.5 | dB | |
| Max.Insertion Loss@23℃ | 20 | dB | |
| Min.Extinction Ratio @23℃(PM Fiber Type) | 20 | dB | |
| Max.Polarization Dependent Loss @23℃(Single Mode Fiber Type) | 0.15 | dB | |
| Min.Return Loss(Input &Output) | 40 | dB | |
| Minimum Crosstalk | 40 | dB | |
| Max.Average Power(includingport 1 and port2) | 0,5,1,2 | W | |
| Max.ns pulse peak power | 10orSpecified | kW | |
| Max.Tensile Load | 5 | N | |
| Package Dimensions | 38×28×26 | mm | |
| Operating temperature | +10~+50 | ℃ | |
| Storage temperature | 0~+60 | ℃ | |
Product Description
The FRM Faraday Reflector Mirrors are advanced passive optical components that leverage the Faraday effect to reflect light with orthogonal polarization, enabling isolation of optical sources from back reflections while preserving signal integrity. Each device integrates a 45° Faraday rotator and a high-reflectivity dielectric mirror, ensuring that incident light is rotated 45° upon transmission, reflected by the mirror, and rotated an additional 45° upon return—resulting in a total 90° polarization rotation. This design eliminates polarization-sensitive back reflections, making it ideal for high-stability laser systems and precision sensing applications.
Features
Polarization Orthogonality: Guarantees 90° polarization rotation for all input states, ensuring back-reflected light is orthogonal to the incident light (isolation ≥30 dB).
Low Insertion Loss: ≤0.5 dB (including Faraday rotator and mirror) with return loss ≥55 dB, minimizing signal degradation.
Wide Wavelength Range: Supports 1260–1625 nm (telecom bands), 1064 nm (laser), and custom wavelengths (e.g., 780 nm, 2050 nm) upon request.
Compact & Rugged Design: ≤20mm in length with hermetic sealing, resistant to vibration, moisture, and temperature fluctuations (-40°C to 85°C).
Passive Operation: Requires no external power, utilizing a permanent magnet to induce the Faraday effect for reliable, maintenance-free performance.
Applications
Fiber Laser Systems: Protects seed lasers and gain media from back reflections in double-pass configurations, stabilizing output power and spectral quality.
Optical Amplifiers: Isolates EDFA input ports from amplified spontaneous emission (ASE) feedback, improving noise figure and gain stability.
Fiber Optic Sensors: Eliminates polarization-induced noise in distributed sensors (e.g., DTS, FBG arrays) by ensuring unidirectional signal flow.
Quantum Communication: Maintains polarization entanglement in quantum key distribution (QKD) systems, even after reflection from remote nodes.
Aerospace & Defense: Reliable performance in airborne laser rangefinders and satellite optical links, where size, weight, and environmental robustness are critical.
Faq
Q: How does the Faraday mirror differ from a standard dielectric mirror?
A: A Faraday mirror rotates the polarization of reflected light by 90°, while a standard mirror reflects light with the same polarization, risking feedback-induced instability.
Q: Can it be used with both linear and circular polarization?
A: Yes, it converts linear polarization to orthogonal linear polarization and circular polarization to opposite-handed circular polarization.
Q: What is the temperature coefficient of polarization rotation?
A: Thermal drift is ≤±1°/°C, ensuring isolation variation ≤±1 dB over the operating temperature range.
Q: Does it support high-power pulsed lasers?
A: Yes, models are available for up to 10 kW peak power (nanosecond pulses) with appropriate thermal management.
Q: Can I use it in a bidirectional communication system?
A: No, it is designed for unidirectional isolation; for bidirectional use, pair with a circulator or separate transmit/receive paths.
Download
F FRM 反射镜 法拉第镜 41-46.pdf 
（41）1064-2050nm PM Faraday Rotator.pdf 
（42）780-1080nm High Power Faraday Rotator Mirror TGG Type 20W FRM.pdf （43）980-1080nm High Power Faraday Rotator Mirror TGG type FRM power 50W-100W .pdf （44）780-2050nm Polarization Maintaining Rotator Mirror PM.pdf （45）780-1080nm High Power Faraday Rotator Mirror TGG type Power 20W FRM .pdf （46）1064-2050nm Fiber Optical Polarization Maintaining PM Faraday Rotator Mirror.pdf 
