532nm / 633nm PM Inline Optical Isolator

Product Description

The 532nm/633nm PM Inline Optical Isolator is a high-performance component designed to enable unidirectional light transmission while suppressing back reflections in polarization-maintaining fiber systems operating at 532 nm (green) and 633 nm (red) wavelengths. Utilizing a Faraday rotator and polarization optics, it ensures that light travels in one direction with high isolation, protecting sensitive optical sources from damaging back reflections. The isolator features a compact inline design (≤25mm length) with PM fiber pigtails and FC/APC connectors, ensuring seamless integration into existing PM fiber links. Its robust construction includes a magnetic shield and temperature-stabilized coatings for reliable operation in demanding environments.

Features

High Isolation: Provides ≥30 dB isolation at 532 nm and ≥28 dB at 633 nm, minimizing back-reflected light.

Low Insertion Loss: ≤0.5 dB for both wavelengths, ensuring minimal signal degradation.

Polarization Preservation: Maintains PER ≥25 dB in the transmitted light, critical for polarization-sensitive applications.

Wide Operating Temperature: -40°C to 85°C with temperature-dependent isolation drift ≤±1 dB.

High Power Handling: Supports up to 500 mW (CW) at 532 nm and 300 mW at 633 nm.

Applications

Laser Systems: Protects 532 nm solid-state lasers and 633 nm helium-neon (He-Ne) lasers from back reflections that cause instability.

Optical Imaging: Ensures unidirectional light flow in polarization-sensitive microscopy and interferometric imaging systems.

Sensor Networks: Prevents signal noise in distributed fiber sensors operating at these visible wavelengths.

Research Labs: Used in spectroscopy, metrology, and quantum communication experiments requiring clean signal paths.

Medical Devices: Safeguards laser sources in diagnostic tools and therapeutic equipment like endoscopes and laser scalers.

Faq

Q: How does the isolator achieve unidirectional transmission?

A: The Faraday rotator rotates the polarization by 45°, which is blocked by the output polarizer for reverse-traveling light.

Q: Can it be used with non-PM fibers?

A: Yes, but polarization maintenance is optimized for PM fibers; non-PM use may reduce PER.

Q: What is the difference in isolation between the two wavelengths?

A: Isolation is ≥30 dB at 532 nm and ≥28 dB at 633 nm due to coating optimization for each band.

Q: Does it require external power?

A: No, it operates passively using the Faraday effect, which relies on a permanent magnet for polarization rotation.

Q: Can it handle pulsed laser inputs?

A: Yes, it supports pulse widths as short as 10 ns with peak powers up to 1 kW (limited by average power rating).