US 12,244,348 B2
System and method for multimodulation in a passive optical network
Doutje Van Veen, New Providence, NJ (US); Amitkumar Mahadevan, Edison, NJ (US); and Vincent Houtsma, New Providence, NJ (US)
Assigned to Nokia Solutions and Networks Oy, Espoo (FI)
Filed by NOKIA SOLUTIONS AND NETWORKS OY, Espoo (FI)
Filed on Apr. 6, 2022, as Appl. No. 17/714,959.
Prior Publication US 2023/0327776 A1, Oct. 12, 2023
Int. Cl. H04B 10/54 (2013.01); H04L 27/26 (2006.01)
CPC H04B 10/541 (2013.01) [H04L 27/2626 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An optical device, comprising:
a signal encoder configured to generate a digital encoding signal using a first modulation format and a different, second modulation format, wherein the second modulation format is a modified pulse amplitude modulation having x amplitude levels (PAMx), wherein x is greater than 2; and
a modulator for modulating a first wavelength of an optical signal using the digital encoding signal, by modulating a first portion of the optical signal with the first modulation format and modulating a second portion of the optical signal with the second modulation format, wherein the modulator modulates the second portion of the optical signal modulated with the modified PAMx format by selecting consecutive symbol patterns to generate a first adapted probability of a first transition between a first pair of amplitude levels that is greater than a second adapted probability of a second transition between a different second pair of amplitude levels.