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Optical pulse division multiplexing-based OBI reduction for single wavelength uplink multiple access in IM/DD
Optics Express
|December 14, 2016
Summary
Orthogonal frequency division multiple access-based passive optical networks (OFDMA-PONs) face uplink interference. A new optical pulse division multiplexing method effectively reduces optical beat interference, enhancing spectral efficiency for next-generation networks.
Area of Science:
- Optical communication systems
- Signal processing for optical networks
Background:
- Orthogonal frequency division multiple access-based passive optical network (OFDMA-PON) is a leading technology for future optical access networks.
- Uplink transmission in intensity modulation/direct detection OFDMA-PON systems suffers from optical beat interference (OBI) and timing offsets due to varying optical paths, hindering signal detection.
Purpose of the Study:
- To propose and demonstrate a novel method for reducing optical beat interference (OBI) in OFDMA-PON uplink transmissions.
- To improve the spectral efficiency of OFDMA-PON systems by mitigating uplink signal disturbances.
Main Methods:
- The study introduces an optical pulse division multiplexing technique for OBI reduction.
- The method leverages spectrum broadening effects and time-domain near-orthogonality to suppress interference.
Main Results:
- Optical beat interference (OBI) was significantly reduced using the proposed optical pulse division multiplexing method.
- Spectral efficiency in a 1-GHz signal bandwidth was improved from 0.37 to 3.8 bit/s/Hz.
Conclusions:
- The proposed optical pulse division multiplexing approach effectively addresses critical uplink OBI issues in OFDMA-PON systems.
- This technique offers a viable solution for enhancing the performance and spectral efficiency of next-generation optical access networks.
