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Dispersion-supported direct-detection mode group division multiplexing using commercial multimode fiber couplers
Optics Letters
|April 2, 2014
Summary
This study demonstrates a novel mode group multiplexing system using intensity modulation and direct detection. The innovative approach bypasses the need for specialized optics, achieving enhanced modal diversity through high modulation rates in standard multimode fibers.
Area of Science:
- Optical Communications
- Photonics
- Signal Processing
Background:
- Mode group multiplexing (MGM) is a promising technique for increasing fiber optic communication capacity.
- Traditional MGM systems often require complex and expensive modally selective optics.
- Existing systems face limitations due to the fiber's length-bandwidth product.
Purpose of the Study:
- To investigate an intensity-modulation direct-detection (IMDD) MGM system.
- To demonstrate MGM without highly modally selective optics.
- To enhance modal diversity using high modulation rates.
Main Methods:
- Utilized commercial multimode couplers for multiplexing and demultiplexing.
- Employed modulation rates significantly exceeding the fiber's length-bandwidth product.
- Conducted theoretical analysis and experimental validation.
Main Results:
- Successfully implemented IMDD MGM without specialized optics.
- Achieved enhanced modal diversity through high-speed modulation.
- Experimental results for OM1 and OM2 fibers confirmed theoretical predictions.
Conclusions:
- The proposed IMDD MGM system offers a cost-effective and practical solution for increasing fiber optic capacity.
- High modulation rates are effective in overcoming fiber limitations and enhancing modal diversity.
- The system's viability is validated for standard multimode fibers.
