In Line Optical Isolator 1310nm 1480nm 1550nm PM Polarization Maintaining Isolator

  GRACYFIBER's in-line PM Isolator is a high-precision optical antireflective device designed to guide unidirectional beam transmission and maintain extremely high polarization purity while completely blocking back reflections. Manufactured using precisely aligned polarization-maintaining fiber, this device comprehensively covers the core operating wavelength range from 1064 nm to 1550 nm. It is available in single-stage and dual-stage configurations to meet different levels of optical isolation requirements from conventional networks to demanding scientific research systems. With ultra-low insertion loss, excellent polarization extinction ratio, and excellent environmental stability, our PM Isolator is a robust barrier protecting vulnerable high-power laser sources and coherent communication receivers from back reflection interference.

(Developed specifically to address your pain points regarding laser damage, optical path feedback interference, and polarization distortion)

Features: Extreme High Isolation and Guaranteed Unidirectional Transmission
Pain Points Solved/Value Boost: In a dual-stage configuration at 1310/1480/1550 nm, it achieves a peak isolation of up to 55 dB and a typical isolation of up to 45 dB. This completely blocks backscattered light caused by defects at the optical connector end face or downstream, ensuring that the front-end high-sensitivity laser (Tx) will not lose lock or physically burn out due to strong optical feedback.

Features: Excellent polarization extinction ratio (ER) and tight slow-axis alignment
Pain points addressed/value benefits: The system offers two configuration options: Type B (Both-axis working, minimum ER 18 dB) or Type F (Fast-axis blocked, minimum ER 20 dB). In Type F mode, the polarization-maintaining fiber and connector positioning key are tightly aligned with the slow axis (Note: ER decreases by 2 dB with the connector). This single-axis or dual-axis polarization control ensures absolute fidelity for polarization mode dispersion (PMD) sensitive signals.

Features: Extremely low insertion loss and high return loss
Pain points addressed/value: Single-stage products in the 1310/1480/1550 nm bands have a maximum insertion loss of only 0.6 dB (typical 0.4 dB), and even two-stage products are kept below 0.8 dB (Note: IL increases by 0.3 dB with connectors). Extremely low signal attenuation combined with a return loss of up to 50 dB (reduced by 5 dB with connectors) significantly optimizes the overall optical power budget for long-haul transmission links.

Features: Multi-wavelength coverage and powerful optical power handling capabilities address pain points/value: Supports multi-band operating windows of 1064 nm ($5 nm/pm) and 1310/1480/1550/1650 nm ($20 nm/pm). Products in the 1310~1650 nm band have an optical power handling capacity of up to 500 mW (150 mW or 200 mW for 1064 nm), and are highly stable over a wide temperature range of -5°C to 65°C, easily handling the challenges of high-power environments such as erbium-doped fiber amplifiers (EDFAs).

Our polarization-maintaining isolators are guardians against backscattering in precision optical systems:

• Fiber Laser & Pumping: Protects high-power pump sources from backscattering damage caused by stimulated Brillouin scattering (SBS).
• Optical Amplifiers (EDFAs): Provides inter-level optical isolation and polarization state maintenance in cascaded amplifier chains.
• Coherent Communication & Polarization Multiplexing: Ensures the purity of the output from the transmitter of long-distance coherent optical modules.
• Interferometry & Sensing: Provides a stable unidirectional optical path for fiber optic gyroscopes (FOGs) and precision strain sensors.
• Quantum Optics: Precisely controls the propagation direction and polarization purity of single photons in quantum computing experiments.