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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
Published on: March 20, 2017
Equalization of two-mode fiber based MIMO signals with larger receiver sets
1Dept of Electrical and Electronic Engineering, The University of Melbourne, VIC 3010, Australia. xi.chen@ee.unimelb.edu.au
Optics Express
|December 25, 2012
Summary
This study shows channel equalization for two-mode fiber MIMO systems. Successive-interference-cancellation (SIC) significantly improved receiver sensitivity in 102-Gb/s experiments.
Area of Science:
- Optical communications
- Signal processing
- Fiber optics
Background:
- Two-mode fiber (TMF) enables higher data rates through mode-division multiplexing (MDM).
- MIMO (Multiple-Input Multiple-Output) systems in optical communications face channel impairments.
- Receiver size exceeding transmitter size presents unique equalization challenges.
Purpose of the Study:
- To demonstrate and evaluate channel equalization techniques for TMF-based MIMO systems.
- To compare the performance of Zero-Forcing (ZF), Minimum-Mean-Square-Error (MMSE), and Successive-Interference-Cancellation (SIC) algorithms.
- To assess the impact of these algorithms on receiver sensitivity in high-speed systems.
Main Methods:
- Experimental verification of a TMF-based MIMO system operating at 102 Gb/s using CO-OFDM (Carrier-Offset Orthogonal Frequency-Division Multiplexing).
- Implementation and comparison of ZF, MMSE, and SIC channel equalization algorithms.
- Measurement of receiver sensitivity improvements under different equalization schemes.
Main Results:
- The 4x6 MIMO system demonstrated successful channel equalization.
- Receiver sensitivity improvements were observed for all tested algorithms.
- SIC provided the largest improvement in receiver sensitivity (4.9 dB), followed by MMSE (2.9 dB) and ZF (1.8 dB).
Conclusions:
- Channel equalization is crucial for effective TMF-based MIMO systems, especially with mismatched transmitter/receiver sizes.
- SIC emerges as the most effective algorithm for enhancing receiver sensitivity in this configuration.
- The experimental validation confirms the feasibility of high-speed (102 Gb/s) mode-division multiplexed systems with advanced equalization.
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