Optical line terminal and method for transmitting digital information
AssigneeCable Television Laboratories, Inc.
InventorsHaipeng Zhang, Zhensheng Jia, Mu Xu
Life of this patent
Estimating the term…
Abstract
An optical line terminal includes an optical comb generator, N downlink channels Dk, and N uplink-photodetectors PDk. The optical comb generator is configured to generate a carrier signal having an optical-frequency-comb spectrum and including N optical tones Tk and N optical tones Rk, k={1, 2, . . . , N}. Each of the N downlink channels Dk is optically coupled to the optical comb generator and is configured to generate a respective downlink signal DSk that includes optical tone Tk modulated by downlink data. Each of the N uplink-photodetectors PDk is configured to receive a respective one of a plurality of modulated uplink signals USk, having optical tone Rk as a carrier signal.
Claims18
An optical line terminal comprising:
- an optical comb generator configured to generate a carrier signal having an optical-frequency-comb spectrum and including N optical tones Tk and N optical tones Rk, k={1, 2, . . . , N};
- N downlink channels Dk, each originating from the optical comb generator and being configured to generate a respective downlink signal DSk that includes optical tone Tk modulated by downlink data;
- and
- N uplink-photodetectors PDk each configured to receive a respective one of a plurality of modulated uplink signals USk, utilizing optical tone Rk .
A method for transmitting digital information comprising:
- generating, with a laser of an optical line terminal, a carrier signal having an optical-frequency-comb spectrum that includes a first optical tone and a second optical tone differing in center wavelength from the first optical tone;
- generating a downlink signal that includes the first optical tone modulated with downlink data;
- injection locking, with the second optical tone, an uplink slave laser of an optical network unit optically coupled to the optical line terminal;
- and
- transmitting the downlink signal to a photodetector of the optical network unit.
Dependencies are inferred from the claim text.