Patent ID: 11868026
Assignee: FUJITSU LIMITED
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. An optical receiver comprising:
an optical analog-to-digital (AD) converter configured to include
wherein the optical AD converter converts an analog signal of information included in inputted signal light into a digital signal, and is formed of N stages corresponding to a number N of bits of the digital signal,
optical waveguides configured to respectively guide the signal light, base light obtained by branching local light, and reference light obtained by branching the local light,
a light receiver configured to detect and compare light levels of the signal light and the reference light, and output a binary comparison result, and
an optical modulator configured to variably control a light level of the base light, based on the binary comparison result, in each stage of the N stages,
wherein an output variably controlled of the optical modulator is multiplexed with the reference light of a next stage;
a local oscillation light source configured to generate the local light; and
a data processor configured to output the information included in the signal light converted by the optical AD converter.