What are the typical applications of polarization-maintaining patch cords?

Polarization-Maintaining patch cords are widely used in fields with extremely high requirements for polarization stability because it can stably maintain the polarization state of optical signals.

The following are typical application scenarios and technical features:

1. Fiber-optic Sensing and Measurement Systems

Interferometers and Gyroscopes: Used in fiber-optic gyroscopes (FOGs) and interferometric sensors, they achieve high-precision measurement of angular velocity or physical quantities (such as temperature, pressure, and strain) by maintaining a stable polarization state.

Quantum Communication: In quantum key distribution (QKD), they ensure that the polarization state of photons is not disturbed, ensuring secure information transmission.

2. Laser and Optical Communication Systems

High-Power Laser Transmission: Connects lasers and modulators to prevent beam quality degradation caused by polarization drift.

Long-Distance Communication: Reduces polarization mode dispersion (PMD) and improves signal integrity in high-speed communication systems.

3. Scientific Research and Industrial Equipment

Spectroscopy and frequency-sensitive applications: Such as Raman spectrometers require short-wavelength polarization-maintaining fiber (e.g., 780 nm) to maintain polarization consistency.

Fiber-optic hydrophones/current sensors: Used for underwater acoustic or electromagnetic field detection, they rely on polarization-maintaining patch cables with a high extinction ratio (>20 dB).

4. Special Environment Applications

Radiation Resistance Requirements: Polarization-maintaining patch cables must be radiation-resistant for use in space or high-radiation environments. These are currently under development.

Key Performance Parameters

• Extinction Ratio: Typical values are 20-23 dB, with≥30 dB required for high-precision applications.
• Connector Type: FC/APC (8°polished) are the mainstream, balancing low return loss (≥55 dB) and mechanical stability.

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