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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Mode partition noise mitigation for VCSEL-MMF links by using wavefront shaping technique
Optics Express
|November 25, 2018
Summary
Wavefront shaping effectively reduces mode partition noise in VCSEL-MMF links, improving bit error rates and enabling higher data rates. This technique also lowers digital signal processing complexity for optical interconnects.
Area of Science:
- Optical communications
- Photonics
- Signal processing
Background:
- Vertical-Cavity Surface-Emitting Laser (VCSEL) and Multimode Fiber (MMF) links are crucial for short-reach optical interconnects.
- Mode Partition Noise (MPN) is a significant impairment affecting performance in these systems.
Purpose of the Study:
- To propose and validate a wavefront shaping technique for mitigating MPN in VCSEL-MMF links.
- To investigate the impact of coupling coefficients on MPN and system performance.
- To demonstrate reduced digital signal processing (DSP) complexity for higher data rates.
Main Methods:
- Theoretical study of VCSEL-MMF link noise characteristics.
- Simulation and experimental investigation of MPN mitigation using wavefront shaping.
- Analysis of bit error rate (BER) and signal standard deviation.
Main Results:
- Wavefront shaping reduced MPN by an order of magnitude, improving BER by five orders for 25-Gb/s OOK signals over 300-m MMF.
- Achieved a 1-dB power penalty improvement at the 7% FEC threshold.
- Demonstrated potential for reduced DSP complexity for 56-Gb/s and 112-Gb/s PAM-4 transmission.
Conclusions:
- Wavefront shaping is an effective method for mitigating MPN in VCSEL-MMF systems.
- The technique enhances transmission performance and reduces DSP requirements.
- This approach is beneficial for high-speed, short-reach optical interconnects.
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