Patent ID: 8923707
Filing Date: 2014-12-30
Classification: H04B

Abstract:
1. An apparatus, comprising: a laser configured to supply a first optical signal, the first optical having a phase that varies; a first optical circuit configured to receive the first optical signal and having first and second outputs, the first output supplying a first portion of the optical signal and the second output supplying a second portion of the optical signal; first and second waveguides coupled to the first output of the first optical circuit, such that light output from the first waveguide is delayed relative to light output from the second waveguide; a second optical circuit coupled to the first and second waveguides, the second optical circuit outputting a second optical signal; a photodetector circuit, including a photodiode, the photodetector circuit receiving the second optical signal and outputting an electrical signal; a processor circuit configured to receive the electrical signal and supply a value indicative of the phase, accumulated at a corresponding one of a plurality of instants in time.