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Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Bit-rate variable DPSK demodulation based on cascaded four-wave mixing.

Yongheng Dai¹, Chester Shu

¹Department of Electronic Engineering and Center for Advanced Research in Photonics, The Chinese University of Hong Kong, Shatin, NT, Hong Kong.

|March 4, 2011

Summary

This summary is machine-generated.

This study introduces a novel demodulator for differential phase shift keying (DPSK) signals using cascaded four-wave mixing (FWM). The device achieves error-free demodulation at variable bit rates by converting phase modulation to intensity modulation.

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Area of Science:

Optoelectronics
Photonics
Optical Communications

Background:

Differential Phase Shift Keying (DPSK) is a spectrally efficient modulation format.
Demodulating DPSK signals at variable bit rates presents significant challenges.
Existing demodulation techniques often lack flexibility or require complex setups.

Purpose of the Study:

To develop a novel demodulator for DPSK signals.
To achieve variable bit rate demodulation.
To convert phase modulation to intensity modulation efficiently.

Main Methods:

Utilized cascaded four-wave mixing (FWM) in a photonic crystal fiber (PCF).
Employed a chirped fiber Bragg grating (CFBG) for signal reflection and dispersion-induced delay.
Generated a wavelength-tunable idler carrying phase information in the first FWM process.
Used the phase relationship between the signal and a delayed idler in the second FWM process to control amplification/attenuation.

Main Results:

Successfully demonstrated error-free demodulation of DPSK signals.
Achieved demodulation for both Non-Return-to-Zero (NRZ) and Return-to-Zero (RZ) formats.
Operated at variable bit rates of 5 Gb/s and 10 Gb/s.
Converted phase modulation to intensity modulation with high fidelity.

Conclusions:

The proposed cascaded FWM demodulator is effective for DPSK signals.
The system offers flexibility for variable bit rate operation.
This approach provides a promising solution for advanced optical communication systems.