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Performance comparison of 0/π- and ± π/2-phase-shifted superstructured Fiber Bragg grating en/decoder
1Joint Research Institute for Integrated Systems, Heriot-Watt University, Edinburgh, UK.
Optics Express
|July 1, 2011
Summary
This study compares 0/π-phase-shifted and ± π/2-phase-shifted sampled fiber Bragg grating (SSFBG) en/decoders. The ± π/2-SSFBG shows improved security and coding performance, with a novel code extraction technique demonstrated.
Area of Science:
- Optical Engineering
- Telecommunications
- Signal Processing
Background:
- Fiber Bragg gratings (FBGs) are crucial components in optical signal processing.
- Phase-shifted FBGs (SSFBGs) offer advanced functionalities for optical code division multiple access (OCDMA) systems.
- Comparing different SSFBG configurations is essential for optimizing OCDMA performance.
Purpose of the Study:
- To comprehensively evaluate and compare the security, coding, and system performance of 0/π-SSFBG and ± π/2-SSFBG en/decoders.
- To introduce and validate a new code extraction technique for ± π/2-SSFBG encoders.
- To explore the potential of hybrid SSFBG en/decoder systems.
Main Methods:
- Security performance was assessed by analyzing encoded waveforms.
- A code extraction technique for ± π/2-SSFBG was proposed and demonstrated for wide pulse inputs.
- Coding performance was evaluated using autocorrelation and cross-correlation analyses with Gold codes (31, 63, 127 chips).
- Hybrid SSFBG en/decoder configurations were proposed and demonstrated.
- System performance was tested using four 31-chip 640 Gchip/s SSFBG en/decoders in a 4-user, 10 Gbps/user OCDMA system with OOK and DPSK modulation.
Main Results:
- The ± π/2-SSFBG en/decoder demonstrated superior security and coding performance compared to the 0/π-SSFBG.
- A novel code extraction technique for ± π/2-SSFBG was successfully demonstrated, particularly for large pulse widths.
- Autocorrelation and cross-correlation analyses confirmed the coding advantages of the ± π/2-SSFBG.
- The hybrid use of both en/decoder types showed promising results for system flexibility.
- Experimental validation in a multi-user OCDMA system confirmed the effectiveness of both en/decoder types and the hybrid approach.
Conclusions:
- The ± π/2-phase-shifted SSFBG en/decoder offers significant advantages in security and coding performance for OCDMA systems.
- The proposed code extraction technique enhances the robustness of ± π/2-SSFBG encoders.
- Hybrid SSFBG configurations present a viable strategy for advanced OCDMA system design.
- Both 0/π-SSFBG and ± π/2-SSFBG en/decoders, as well as their hybrid integration, are suitable for high-speed OCDMA applications.
