1. Industry Pain Points: Typical Transmission Challenges in Fiber Amplifiers (H2)
High insertion loss, polarization distortion, backward optical interference, and excessive return loss are key issues affecting stability in polarization-maintaining fiber amplification systems. Conventional circulators often suffer from polarization degradation and insufficient isolation under narrow-band or high-power conditions, leading to elevated noise, degraded optical path consistency, and failure to support long-term reliable operation for CW and pulse lasers.
1.1 Manifestations of Core Pain Points (H3)
- Excessive insertion loss reducing system power efficiency
- Insufficient polarization maintenance causing signal distortion
- Backward reflection and crosstalk interfering with upstream components
- Poor multi-band compatibility, failing to cover 532~1150nm
- Performance drift under high power, lowering reliability
2. Technical Solution: TGG-Based PM Circulator (H2)
Gezhi Photonics’ TGG-based polarization-maintaining circulator uses terbium gallium garnet crystal as the core rotatory material and adopts a 3-port PM optical path design. It delivers unidirectional transmission with low loss, high isolation, and high return loss within the target wavelength range, fundamentally solving polarization and loss challenges for fiber amplifiers.
2.1 Core Performance Specifications (H3)
Operating wavelengths include 532, 635, 680, 780, 808, 850, 930, 980, 1030, 1053, 1064, and 1150nm, compatible with PM460/PM630/PM780/PM980/PM1060 fibers. Key parameters: typical insertion loss ≤1.5dB~2.5dB; min. isolation ≥20dB~22dB; peak isolation ≥25dB~26dB; extinction ratio ≥18dB (Type B) / ≥20dB (Type F); crosstalk ≥45dB; return loss ≥45dB; operating temperature 0~+60℃.
2.2 Value for Fiber Amplifiers (H3)
In fiber amplifier links, the PM circulator enables directional signal transmission and reverse isolation, reducing echo interference to pump sources and gain media, preserving polarization consistency, and improving system SNR and long-term stability. Housed in a standard 70×28×26mm package for easy integration, it supports up to 20W CW power handling, suitable for CW and pulse laser systems.
3. Selection and Application Guidelines (H2)
For fiber amplifier integration, confirm wavelength bandwidth, fiber type, power rating, and connector type before selection. Connectorized versions add 0.3dB IL, reduce RL by 5dB, and reduce ER by 2dB. For pulse applications, specify pulse energy and peak power to ensure reliable long-term operation.
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