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Demonstration of a highly bandwidth-efficient optical interconnection with symbol division multiplexing pulse
Optics Letters
|May 13, 2022
Summary
A new symbol division multiplexing (SDM) technology for optical interconnections boosts data rates by 50% using SDM-PAM4. This method improves transmission reliability and receiver sensitivity over standard PAM4 systems.
Area of Science:
- Optical communication systems
- Signal processing
- Information theory
Background:
- Intensity modulation and direct detection (IM/DD) systems are crucial for optical interconnections.
- Pulse amplitude modulation (PAM) is a key technology for increasing data rates.
- Existing PAM systems face limitations in line rate and transmission reliability due to impairments like chromatic dispersion and nonlinearity.
Purpose of the Study:
- To propose and investigate a novel symbol division multiplexing (SDM) technology for IM/DD PAM optical interconnections.
- To enhance the line rate and transmission reliability of optical interconnects.
- To demonstrate the effectiveness of SDM-PAM4 in overcoming signal impairments.
Main Methods:
- Developing a novel SDM technology by multiplexing two 3-bit PAM8 symbols into one SDM-PAM4 symbol using many-to-one (MTO) mapping.
- Implementing a forward error correction (FEC) mechanism based on low-density parity-check (LDPC) coding for iterative decoding.
- Utilizing an optimized bit-interleaved coded modulation iterative decoding (BICM-ID) system for symbol de-multiplexing.
- Analyzing the impact of SDM on reducing PAM signal mapping order to alleviate fiber chromatic dispersion and Kerr nonlinearity.
Main Results:
- Achieved a 50% increase in line rate compared to typical PAM4 at the same symbol rate and channel bandwidth.
- Demonstrated improved transmission reliability by reducing signal mapping order.
- Experimental results showed over 5 dB superior systematic receiver power sensitivity over 10-km single mode fiber transmission.
- Validated the theoretical support for iterative decoding of symbol de-multiplexing.
Conclusions:
- The proposed SDM-PAM4 technology offers a significant advancement for optical interconnection systems.
- SDM-PAM4 effectively enhances data rates and transmission reliability.
- This technology represents an important development in coding and modulation multiplexing for future optical networks.
