Infinera Corporation

Mohsen Nader Tehrani

Han Henry Sun

Kuang-Tsan Wu

David J Krause

Mehdi Torbatian

Alex Nicolescu

Consistent with a further aspect of the present disclosure, previously encoded data is stored in a memory, and an encoder accesses both input data and previously encoded data to generate new encoded data or a new codeword. Each codeword is stored in a row of the memory, and with each newly generated codeword, each previously stored code word is shifted to an adjacent row of the memory. In one example, the memory is delineated as a plurality of blocks including rows and columns of bits. When generating a new code word, randomly selected columns of bits in the memory are read from randomly selected blocks of the memory and supplied to the encoder. In this manner the number of times the memory is access is reduced and power consumption is reduced.

Methods and apparatus for power efficient design of forward error correction for optical communication systems

Consistent with the present disclosure, codewords indicative of a super Gaussian distribution may be encoded and decoded using the encoders and decoders disclosed herein. Based on such codewords, symbols may be transmitted in accordance or in conformance with a super Gaussian distribution to tailor the SE of an optical signal or subcarrier for a given link having non-linear degradations and shaping gain. Such tailed SE may not be achievable with a Gaussian symbol transmission probability distribution.

Nonlinear tolerant super-Gaussian distribution for probabilistic shaping modulation

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for clock recovery in subcarrier based coherent optical systems. In one aspect, an apparatus includes a plurality of phase detectors configured to generate a plurality of phase detection outputs by detecting a plurality of digital signals associated with a plurality of frequency bands, each of the plurality of phase detection outputs being associated with a respective one of the plurality of frequency bands, alignment circuitry coupled to the plurality of phase detectors and configured to align phases of the plurality of phase detection outputs to be substantially same, and averaging circuitry coupled to the alignment circuitry and configured to generate a particular output based on the plurality of phase detection outputs with the aligned phases. The plurality of digital signals is adjusted based on the particular output.

Growing community of inventors

Kanata, Canada

Mohsen Nader Tehrani