Patent ID: 6388787
Filing Date: 2002-05-14
Classification: H03L,H04B

Abstract:
A method for generating an optical frequency for a wavelength-division multiplex operation, comprising the steps of:generating a first optical signal via a first laser diode on which a low-frequency signal of small amplitude is superimposed; conducting the first optical signal through a gas-filled galvanotron, the low-frequency signal emerging at two terminals of the galvanotron; feeding the low-frequency signal to a synchronous detector and emitting a first output signal for generating a control signal; controlling the first laser diode via the control signal and the low-frequency signal, wherein the first optical signal passing through the gas-filled galvanotron represents a first frequency reference signal; generating a second optical signal via a second laser diode, emitting the second optical signal via a first fiber-optic directing coupler to a signal output and to a second fiber-optic directing coupler; generating a microwave signal by combining the second optical signal and the first frequency reference signal via an opto-electronic converter, feeding the microwave signal to a frequency control loop subsequent to opto-electric conversion and mixing the microwave signal with a quartz-based frequency synthesizer signal for generating a difference low-frequency signal; and providing a phase comparison of a signal of a quartz oscillator and the difference low-frequency signal resulting in a second output signal for generating a control signal for the second laser diode.