Optical communication interface utilizing N-dimensional double square quadrature amplitude modulation

摘要

The present invention is directed to data communication system and methods. More specifically, various embodiments of the present invention provide a communication interface that is configured to transfer data at high bandwidth using nDSQ format(s) over optical communication networks. In certain embodiments, the communication interface is used by various devices, such as spine switches and leaf switches, within a spine-leaf network architecture, which allows large amount of data to be shared among servers.

主权项

1. A communication device configured to generate n-dimensional double square quadrature amplitude modulation (nDSQ) coded signals for pulse amplitude modulation with m levels (PAMm), the device comprising:
a communication interface for receiving incoming data; a clock data recovery circuit configured to process the incoming data; an encoder configured to encode the incoming data into coded symbols, each coded symbols comprising most significant bits (MSBs) and least significant bits (LSBs); a symbol mapper that maps the coded symbols into the n-dimensional DSQ constellation, wherein: the MSBs comprising (2*n) bits are mapped to PAM (m/2) symbols; the LSBs comprising (n−1) bits are mapped to PAM2 symbols with a 1-bit parity; the PAM (m/2) symbols and the PAM2 symbols are added to generate the nDSQ coded signals.