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Quasi-light Storage for Optical Data Packets

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High-speed wavelength tunable DPSK demodulation using a phase modulator based loop mirror filter.

Jia Ge, Hanlin Feng, Mable P Fok

|July 1, 2014

Summary

This summary is machine-generated.

This study introduces a fast, tunable fiber loop mirror filter for demodulating differential phase-shift-keying (DPSK) signals. It achieves high-speed wavelength tuning and error-free performance across various bit rates.

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Area of Science:

Optical engineering
Telecommunications
Photonics

Background:

Differential phase-shift-keying (DPSK) is crucial for high-speed optical communication.
Wavelength tuning speed and range are critical limitations in current demodulator designs.
Fiber loop mirror filters offer potential for compact and efficient optical signal processing.

Purpose of the Study:

To develop a high-speed wavelength tunable demodulator for DPSK signals.
To enhance the tuning speed and range of fiber optic filters.
To achieve error-free demodulation across a flexible range of bit rates.

Main Methods:

Utilized a phase modulator (PM) based fiber loop mirror filter.
Controlled PM birefringence via electro-optic effect for wavelength tuning.
Integrated polarization maintaining fiber with the PM for enhanced performance.

Main Results:

Achieved wavelength tuning speeds of tens of GHz.
Demonstrated a tuning range exceeding two free spectral ranges.
Obtained stable filter spectra with an extinction ratio over 30 dB.
Experimentally verified error-free demodulation for DPSK signals (2.5–10 Gb/s).

Conclusions:

The developed PM-based fiber loop mirror filter significantly improves wavelength tuning speed.
This technology is valuable for high-speed optical switching and tuning applications.
Error-free performance across a wide bit-rate range was successfully demonstrated.