Importance

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Abstract

The invention relates to an adjustable signal source with low phase noise, comprising:

an optical-microwave phase detector (BOMPD) which comprises: an intensity modulator (BIM) having an optical signal input, a modulation input (1), a first output (O1), and a second output (O2),a first photodiode (PD1) which can be irradiated by light from the first output (O1) during operation,a second photodiode (PD2) which can be irradiated by light from the second output (O2) during operation,wherein the first photodiode (PD1) and the second photodiode (PD2) are connected in series in a biased manner during operation,wherein a tap for a tap signal is arranged between the first photodiode (PD1) and the second photodiode (PD2), further comprising a controllable DC power source (N4),wherein an offset current is can be set at the tap during operation by means of the first DC power source (N4), whereby the symmetry of the optical-microwave phase detector is canceled by an offset current during operation,wherein the tap is routed to a low-pass filter with any potential offset current,wherein the low-pass filtered tap signal is provided to an adjustable oscillator (OSZ).

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First Claim