Patent ID: 8634680
Filing Date: 2014-01-21
Classification: G02B,G02F

Abstract:
1. A wavelength control device comprising: a first Mach-Zehnder filter which includes two waveguides, receives a first optical signal from an end of either one of the two waveguides, and outputs a predetermined optical signal from the two waveguides based on a wavelength of the first optical signal; a second Mach-Zehnder filter which includes two waveguides, receives a second optical signal from an end of either one of the two waveguides, and outputs a predetermined optical signal from the two waveguides based on a wavelength of the second optical signal; a heating unit which heats a part of either one of the waveguides of the first Mach-Zehnder filter and a part of either one of the waveguides of the second Mach-Zehnder filter; a first wavelength detecting unit which detects a wavelength of the optical signal received by the first Mach-Zehnder filter based on an intensity of the optical signal output by the two waveguides of the first Mach-Zehnder filter; a second wavelength detecting unit which detects a wavelength of the optical signal received by the second Mach-Zehnder filter based on an intensity of the optical signal output by the two waveguides of the second Mach-Zehnder filter; a power control unit which adjusts a heating level by controlling power to be supplied to the heating unit based on the wavelength detected by the first wavelength detecting unit; an output unit which outputs a signal instructing a wavelength of the second optical signal based on the wavelength detected by the second wavelength detecting unit; a plurality of optical monitors at an end of each of each waveguide of each of the first Mach-Zehnder filter and the second Mach-Zehnder filter; a first optical tap that taps the first optical signal to feed the first Mach-Zehnder filter; a second optical tap that taps the second optical signal to feed the second Mach-Zehnder filter; and a local oscillation control source instructed and controlled by the output unit.