Twin-SSB signal reception without optical SSB filters based on self-coherent detection

Abstract

Dater center interconnection has stimulated the development of short-reach optical communication transmission. To increase the capacity of the single sideband (SSB) system with direct-detection (DD), the twin-SSB system can double the system capacity without an extra optical modulator. Recently, the Stokes vector receiver (SVR) bridges the coherent detection and DD. A carrier can be sent along with the signal so that the SVR can utilize the reference carrier to conduct self-coherent detection and realize a linear complex optical detection, which is similar to the coherent receiver. In this paper, we propose a twin-SSB reception without optical SSB filters based on self-coherent detection. The proposed scheme greatly reduces the implementation complexity and has higher spectral efficiency (SE) compared with the traditional twin-SSB signal detection where two narrow-band optical filters and guard band are used for SSB signal extracting and inter crosstalk suppression. Meanwhile, the proposed twin-SSB signal detection with self-coherent detection also helps to relax the receiver digital signal processing (DSP), since the self-coherent detection reduces the inter crosstalk between the twin-SSB. The twin-SSB reception with self-coherent detection scheme makes it suitable for future high-speed short and medium-reach applications, such as the data center interconnect and metro area network.

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