Method for generating an optical frequency reference signal

A circuit arrangement for generating a frequency reference signal, comprising:

• a sub-circuit for producing a first frequency reference signal, the sub-circuit including a first oscillator, a synchronous detector, a first controller, an adder, a first laser diode, a galvanotron, and first and second lens, the first oscillator having first output connected to a first input of the synchronous detector and a second output connected to a first input of the adder and generating a low-frequency signal, the synchronous detector having a second input and a third input connected to the galvanotron via a high voltage source, a capacitor and a resistor and an output connected to the first controller, the first controller having an output connected to a second input of the adder and generating an output signal to the adder, the adder generating a control signal to the first laser diode via a first laser diode current source, the first laser diode, galvanotron and first and second lens being connected to form a light path that outputs the first frequency reference signal;
• a second current source;
• a second laser diode connected to the second current source, the second laser diode generating an output light;
• a third lens;
• a first fiber-optic directing coupler which receives the output light via the third lens, the first fiber-optic directing coupler having a first input and first and second outputs, the first output connected to a signal output via a third optical fiber;
• a second fiber-optic directing coupler having first and second inputs, the first input being coupled to the second lens via a first optical fiber, the second input connected to the second output of the first fiber-optic directing coupler via a second optical fiber;
• an opto-electronic converter connected to the second fiber-optic directing coupler, the opto-electronic converter having an output generates a first microwave signal;
• a modulator having first and second signal inputs and an output, the first signal input connected to the output of the opto-electronic converter;
• a frequency synthesizer having an input and an output connected to the second signal input, the frequency synthesizer generates a second microwave signal;
• a quartz oscillator having first and second outputs, the first output connected to the input of the frequency synthesizer;
• a first frequency divider having an input connected to the modulator via a low pass filter, and an output;
• a phase detector having first and second inputs and an output the first input connected to the output of the first frequency divider;
• a second frequency divider having an input connected to the quartz oscillator and an output connected to the second input of the phase detector;
• and
• a second controller having an input connected to the output of the phase detector
• and an output connected to the second current source, wherein the second controller generates a control signal to the second current source and the second laser diode generates a second frequency reference signal.