Patent ID: 11902079
Assignee: INFINERA CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A transmitter, comprising:
a laser; and
a modulator, which receives light output from the laser and a drive signal, such that, based on the drive signal, the modulator supplies a modulated optical signal that includes a plurality of subcarriers,, wherein each of the plurality of subcarriers is a Nyquist subcarrier, and, each of the plurality of subcarriers carries a corresponding one of a plurality of sequences of modulation symbols in accordance with a respective one of a plurality transmission probability distributions,, wherein a first one of the plurality of subcarriers carries a first one of the plurality of sequences of modulation symbols, the first one of the plurality of sequences of modulation symbols includes first modulation symbols and second modulation symbols, the first modulation symbols being transmitted more frequently than the second modulation symbols in accordance with a first one of the plurality of transmission probability distributions, and, wherein a second one of the plurality of the plurality of subcarriers carries a second one of the plurality of sequences of modulation symbols, the second one of the plurality of sequences of modulation symbols includes third modulation symbols and fourth modulation symbols, the third modulation symbols being transmitted more frequently than the fourth modulation symbols in accordance with a second one of the plurality of transmission probability distributions, which is different than the first one of the plurality of transmission probability distributions.