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Reduction of polarization-induced performance degradation in WDM PON utilizing MQW-SLD-based broadband source
Optics Express
|June 25, 2009
Summary
To reduce polarization issues in WDM PON systems, this study found that depolarizing the MQW-SLD output is crucial. This ensures the wavelength-locked FPLD maintains stable performance, minimizing signal degradation.
Area of Science:
- Optical communications
- Photonics
- Telecommunications engineering
Background:
- Wavelength Division Multiplexing Passive Optical Networks (WDM PON) are susceptible to performance degradation.
- Polarization-induced effects can significantly impact signal quality in optical networks.
- Injection locking is a key technique for stabilizing lasers in WDM systems.
Purpose of the Study:
- To investigate methods for reducing polarization-induced performance degradation in WDM PON.
- To determine the optimal conditions for using a MQW-SLD-based ASE source for injection locking.
- To achieve a polarization-induced Q penalty of less than 0.5 dB.
Main Methods:
- Utilizing a MQW-SLD-based Amplified Spontaneous Emission (ASE) source.
- Implementing injection locking to a Fabry-Perot Laser Diode (FPLD).
- Analyzing the impact of output polarization state on system performance.
Main Results:
- Successful reduction of polarization-induced Q penalty below 0.5 dB.
- Demonstrated the effectiveness of depolarizing the MQW-SLD output.
- Established the critical role of the locking range of the wavelength-locked FPLD.
Conclusions:
- Depolarizing the MQW-SLD output is essential for suppressing polarization-induced Q penalty in WDM PON.
- Optimal performance is achieved when the MQW-SLD output is depolarized within the FPLD's locking range.
- This technique enhances the reliability and stability of WDM PON systems.
