Polarization Stabilization & High Power Reliability: Xionghua Photonics’ 1550 nm Polarization-Maintaining High-Power Fiber Circulator

I. Product Overview

Xionghua Photonics, deeply rooted in the fields of passive optical devices and core fiber optic sensing components, has launched a 1550 nm polarization-maintaining high-power fiber optic circulator for high-power fiber lasers, coherent optical communication, precision fiber optic sensing, and high-end test and measurement systems. Based on the Faraday magneto-optical effect and polarization-maintaining optical path design, this device achieves non-reciprocal unidirectional transmission at the C-band center wavelength, stable polarization state maintenance, and high power tolerance. It provides low-loss conduction, high isolation protection, and echo suppression for the system, making it a key core component of high-power polarization-maintaining optical links.

The product adopts an all-fiber structure, high-damage-threshold optical coating, enhanced heat dissipation, and industrial-grade packaging. It maintains stable performance under continuous light and pulsed light operating conditions and is widely adaptable to high-power polarization-maintaining fiber amplifiers, MOPA lasers, distributed fiber optic sensing, coherent communication, and lidar applications, meeting the integrated needs of high power, polarization maintenance, and high reliability in scientific research, industry, and communications.

II. Core Design and Technological Advantages

• 1. Polarization-Maintaining Optical Path and Non-Reciprocal Transmission
• The device employs a three-port standard circulator route: low-loss conduction from 1 to 2, low-loss conduction from 2 to 3, and high-isolation blocking in the reverse direction. Combined with panda-type polarization-maintaining fiber and a polarization control unit, it strictly maintains the polarization state of the optical signal, ensuring stable polarization extinction ratio and extremely low polarization-dependent loss, making it suitable for coherent detection, precision sensing, and polarization-sensitive systems.
• 2. High Power Tolerance and Damage Resistance
• High-purity magneto-optical crystals and high-damage-threshold coatings are used. The optimized beam-expanding and collimating optical path reduces power density. Adhesive-free coupling, all-metal packaging, and low-thermal-resistance heat dissipation channels effectively suppress thermal absorption, thermal lensing, and performance drift under high power. It supports stable operation at 5 W/10 W/20 W/30 W continuous wave (CW) power, meeting the requirements for long-term continuous operation in industrial applications.
• 3. Low Loss and High Isolation Performance
• The 1550 nm center wavelength covers the mainstream C-band window, with insertion loss ≤0.8 dB, isolation ≥35 dB, and return loss ≥55 dB, significantly reducing link power loss, effectively blocking back-reflected light, protecting the pump source, gain module, and laser from return damage, and improving system signal-to-noise ratio and long-term reliability.
• 4. Wide Temperature Range and Industrial-Grade Reliability

Operating temperature range -40℃ to +85℃, vibration- and shock-resistant design meets harsh environments such as outdoor, automotive, and industrial sites; supports FC/APC and SC/APC standard interfaces, 8° angled grinding further reduces return, and can be matched with conventional polarization-maintaining fiber and large-mode-area high-power fiber, offering convenient integration and strong compatibility.

III. Key Performance Parameters (Typical Values)

• – Center Wavelength: 1550 nm
• – Operating Bandwidth: 1520–1580 nm (C-band)
• – Port Configuration: 3 ports, 1→2, 2→3 unidirectional conduction
• – Polarization Maintaining Type: Panda-type polarization maintaining fiber (PM)
• – Power Capacity: 5 W/10 W/20 W/30 W CW (higher power can be customized)
• – Insertion Loss IL: ≤0.8 dB (typical ≤0.6 dB)
• – Isolation ISO: ≥35 dB (typical ≥40 dB)
• – Return Loss RL: ≥55 dB
• – Polarization Dependent Loss PDL: ≤0.1 dB
• – Polarization Extinction Ratio PER: ≥20 dB
• – Operating Temperature: -40℃~+85℃
• – Fiber Type: Polarization maintaining fiber (high power fiber can be customized)
• – Interface Type: FC/APC, SC/APC (default 8° tilt)
• – Packaging: Metal-sealed miniaturized package

IV. Typical Application Scenarios

1. High-Power Polarization-Maintaining Fiber Laser Systems

Used in MOPA structures, polarization-maintaining fiber oscillators, and amplifiers to achieve pump combining, intracavity signal routing, pulse reflection, and backlight isolation, ensuring polarization stability and power safety in industrial processing, medical lasers, and scientific research laser systems.

2. Coherent Optical Communication and Optical Amplification

Separating signal light and pump light in EDFAs, Raman amplifiers, and coherent transmission links to suppress reflection noise, improve amplification efficiency and system sensitivity, and adapt to 5G bearers, trunk transmissions, and data center interconnects.

3. Distributed Fiber Optic Sensing

In long-distance monitoring of BOTDR/BOTDA/Φ-OTDR, oil and gas pipelines, power fiber optic cables, and rail transit security systems, separating probe light and backscattered signals to improve detection distance and signal-to-noise ratio, achieving high-precision distributed measurement.

4. Test and Measurement & Scientific Instruments

Used in OTDR, LiDAR, ultrafast laser, and precision spectroscopy systems, providing unidirectional transmission and high isolation protection to ensure measurement accuracy and equipment safety, meeting the needs of laboratories and high-end equipment.

V. XiongHua Photonics Product Value

• – Customization Capability: Supports customization of wavelength, power, fiber type, interface, and packaging, quickly responding to special scenario requirements.
• – High-Reliability Mass Production: Mature processes and strict quality control ensure batch consistency and long-term stability, reducing system maintenance costs.
• – One-Stop Solution: Circulators, isolators, wavelength division multiplexers, optical switches, and sensing modules work together to provide a complete solution for polarization-maintaining high-power optical links.
• – Technical Support: A professional engineering team provides selection, integration, and testing support to help customers quickly implement and optimize systems.

VI. Summary

XiongHua Photonics’ 1550 nm polarization-maintaining high-power fiber optic circulator, with its core advantages of polarization-maintaining steady-state operation, high power tolerance, low loss and high isolation, and wide-temperature high reliability, fills the market demand for high-end polarization-maintaining high-power non-reciprocal devices. In the fields of fiber lasers, coherent communication, distributed sensing, and precision measurement, we provide stable, efficient, and secure optical path control and echo protection for systems, helping customers build high-performance, highly reliable next-generation optical systems.

Looking to the future, XiongHua Photonics will continue to iterate on materials, optical path, and packaging technologies, driving devices towards higher power, smaller size, lower loss, and higher integration, providing the global optoelectronic industry with more competitive core devices and solutions.