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Few-mode fiber Bragg grating-based simultaneous multichannel CSRZ to NRZ format conversion scheme for LP01 and LP11
Optics Express
|March 5, 2024
Summary
This study introduces a novel fiber optic method using a few-mode fiber Bragg grating (FM-FBG) for converting optical signal formats from carrier-suppressed return-to-zero (CSRZ) to non-return-to-zero (NRZ). The technique successfully converts multiple channels with high signal quality, demonstrating robustness.
Area of Science:
- Photonics and Optical Communications
- Fiber Optic Signal Processing
Background:
- Optical signal format conversion is crucial for high-speed data transmission.
- Existing methods for converting carrier-suppressed return-to-zero (CSRZ) to non-return-to-zero (NRZ) signals face limitations, especially in multi-mode fiber systems.
Purpose of the Study:
- To propose and demonstrate a novel multichannel format conversion scheme.
- To achieve efficient CSRZ to NRZ conversion for both LP01 and LP11 modes using a few-mode fiber Bragg grating (FM-FBG).
Main Methods:
- Design of a multichannel spectral response for FM-FBG based on the spectral difference between CSRZ and NRZ signals.
- Co-design of LP11 mode response spectra to align with LP01 mode spectra for simultaneous mode filtering.
- Numerical simulation of four 40 Gbit/s, 200-GHz-spaced CSRZ channels converted to NRZ signals.
Main Results:
- Successful conversion of both LP01 and LP11 channels from CSRZ to NRZ format.
- Achieved high Q-factors exceeding 14 dB for the converted NRZ signals.
- Demonstrated clean and open eye diagrams for the converted signals, indicating high signal integrity.
- Confirmed robustness of the FM-FBG scheme against central wavelength detuning.
Conclusions:
- The proposed FM-FBG scheme offers an effective solution for multichannel CSRZ to NRZ format conversion in few-mode fibers.
- The method supports simultaneous processing of LP01 and LP11 modes, enhancing spectral efficiency.
- The demonstrated robustness and high performance make this scheme promising for future optical communication systems.
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