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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
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Joint probabilistic shaping and pre-equalization for hollow-core fiber transmission using end-to-end learning
Optics Letters
|February 28, 2025
Summary
We introduce a novel end-to-end learning scheme using a time-frequency decoupling network for probabilistic shaping and pre-equalization in hollow-core fiber systems, improving OSNR by up to 1.6 dB.
Area of Science:
- Optical Communications
- Machine Learning in Photonics
- Fiber Optic Transmission
Background:
- Hollow-core fiber (HCF) offers potential for high-capacity wavelength division multiplexing (WDM) systems.
- Signal impairments in HCF, including linear and nonlinear distortions, pose challenges for system performance.
- Joint probabilistic shaping (PS) and pre-equalization are crucial for mitigating these impairments.
Purpose of the Study:
- To propose a novel end-to-end (E2E) learning scheme for joint PS and pre-equalization in HCF-based WDM systems.
- To develop a time-frequency decoupling network (TFDnet) emulator for modeling HCF channel impairments.
- To enhance the performance of HCF-based WDM systems through optimized signal processing.
Main Methods:
- A time-frequency decoupling network (TFDnet) was developed to model HCF transmission channels by separating signal impairments.
- An E2E learning strategy utilizing the TFDnet emulator was implemented for joint PS and pre-equalization.
- Experimental validation was performed on a 30-channel, 10 km HCF-based WDM system.
Main Results:
- The TFDnet-based joint PS and pre-equalization scheme achieved superior bit-error rate (BER) performance.
- An optical signal-to-noise ratio (OSNR) improvement of 1.0 dB and 1.6 dB was observed compared to CGAN-based and traditional methods, respectively.
- The scheme met the 20% hard-decision forward error correction (HD-FEC) threshold.
Conclusions:
- The proposed TFDnet-based E2E learning scheme effectively compensates for signal impairments in HCF-based WDM systems.
- This approach demonstrates significant OSNR improvements, enhancing system capacity.
- The TFDnet strategy shows promise for future ultrahigh-capacity optical communication systems.
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