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Novel synchronous DPSK optical regenerator based on a feed-forward based carrier extraction scheme
Selwan K Ibrahim1, Stylianos Sygletos, Danish Rafique
1Photonic Systems Group, Department of Physics and Tyndall National Institute, University College Cork, Ireland. selwan.ibrahim@tyndall.ie
Optics Express
|June 7, 2011
Summary
This study presents a novel optical-electronic oscillator (OEO) regenerator for 10.66 Gbit/s differential phase-shift keying (DPSK) signals. The new design synchronizes signal wavelength and maintains narrow linewidth, improving signal quality.
Area of Science:
- Optical communications
- Signal processing
- Laser physics
Background:
- Differential phase-shift keying (DPSK) signals are crucial in high-speed optical networks.
- Optical-electronic oscillator (OEO) regenerators are essential for maintaining signal integrity over long distances.
- Wavelength synchronization and linewidth preservation are key challenges in OEO regenerator design.
Purpose of the Study:
- To experimentally demonstrate a novel synchronous 10.66 Gbit/s DPSK OEO regenerator.
- To achieve wavelength synchronization of the regenerated signal to the incoming signal wavelength.
- To evaluate the phase regeneration capabilities and overall performance of the proposed OEO regenerator.
Main Methods:
- Utilizing a feed-forward carrier extraction scheme with an injection-locked laser for wavelength synchronization.
- Employing a low-cost Distributed Feedback (DFB) laser in the regenerator.
- Emulating random Gaussian phase noise using a phase modulator and arbitrary waveform generator to assess phase regeneration.
- Evaluating performance through electrical eye-diagrams, Bit Error Rate (BER) measurements, and constellation diagrams.
Main Results:
- Successful demonstration of a synchronous 10.66 Gbit/s DPSK OEO regenerator.
- Achieved wavelength synchronization of the regenerated signal to the transmitter laser wavelength.
- The low-cost DFB laser exhibited comparable linewidth characteristics to the narrow-linewidth transmitter laser after injection-locking.
- Effective phase regeneration demonstrated through BER and eye-diagram analysis.
Conclusions:
- The novel synchronous DPSK OEO regenerator effectively synchronizes signal wavelength and preserves linewidth.
- The feed-forward carrier extraction scheme with injection-locking is a viable method for achieving high-performance OEO regeneration.
- The demonstrated technology offers a promising solution for enhancing the quality of high-speed optical signals.
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