PRODUCTION OF AN OPTICAL FREQUENCY REFERENCE SIGNAL

摘要

A first optical signal is generated via a first laser diode on which a low-frequency signal of small amplitude is superimposed. The first optical signal is conducted through a gas-filled galvanotron and the low-frequency signal emerges at two terminals of the galvanotron. The low-frequency signal is fed to a synchronous detector and emits a first output signal for generating a control signal. The first laser diode is controlled via the control signal and the low-frequency signal, the first optical signal passes through the gas-filled galvanotron and represents a first frequency reference signal. A second optical signal is generated via a second laser diode and emits the second optical signal via a first fiber-optic directing coupler to a signal output and to a second fiber-optic directing coupler. A microwave signal is generated by combining the second optical signal and the first frequency reference signal via an opto-electronic converter. The microwave signal is fed to a frequency control loop subsequent to opto-electric conversion and mixes the microwave signal with a quartz-based frequency synthesizer signal for generating a difference low-frequency signal. A phase comparison is provided of a signal of the quartz oscillator and the difference low-frequency signal resulting in a second output signal for generating a control signal for the second laser diode.