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

Claim 7:
8. A system, comprising:
a transmitter including 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 first modulated optical signal that includes first and second subcarriers,
wherein each of the first and second subcarriers is a Nyquist subcarrier, and
the first subcarrier carries a first sequence of modulation symbols in accordance with a first transmission probability distribution, and the second subcarrier carries a second sequence of modulation symbols in accordance with a second transmission probability distribution,
the first sequence 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 the first transmission probability distribution, and
the second sequence 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 the second transmission probability distribution, which is different than the first transmission probability distribution; and
a multiplexer that receives the first modulated optical signal and a second modulated optical signal and supplies the first and second modulated optical signals to an optical communication path.