Patent ID: 9158069
Filing Date: 2015-10-13
Classification: G02B,G02F,Y10T

Abstract:
1. Apparatus, comprising: an optical ring resonator; a first optical coupler, which is configured to modulate an input optical signal traversing an optical waveguide, by tuning cross-coupling of energy between the optical waveguide and the ring resonator with a first variable coupling coefficient; a second optical coupler, which is configured to tune cross-coupling of energy between the ring resonator and an auxiliary optical signal, different from the input optical signal, with a second variable coupling coefficient; and control circuitry, which is configured to modulate the first coupling coefficient with a first control signal so as to modulate the input optical signal with a time-varying magnitude, to derive a second control signal from the first control signal, and to modulate the second coupling coefficient with a second control signal, wherein the second control signal is derived from the first control signal using a relation that retains a constant electrical-field complex envelope in the ring resonator regardless of the time-varying magnitude with which the input optical signal is modulated.