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AssigneeThe Secretary of State for Defence in her Britannic Majecty's Government of the United Kingdom of Great Britain and Northern Ireland
InventorsMeirion F. Lewis, David R. Wight
Estimating the term…
A single frequency oscillator (10) comprises a laser diode (12), a fibre optic bundle (22) acting as a delay line filter, a photodiode (26) and a feedback loop to the laser diode (12) containing an amplifier (28) and additional low Q filtering (29, 34). The laser diode output (18) bears a modulation signal which is filtered to a series of "resonant" or synchronous frequencies by the bundle (22), converted back to an electrical signal by the diode (26) amplified, and reduced to a single resonant frequency by the low Q filtering (29, 34). It is then applied to the laser diode (12) as positive feedback to modulate the diode output (18). The output of the oscillator (10) can be taken as a microwave signal or on an optical carrier. The invention provides an oscillator incorporating feedback on an optical carrier.
An oscillator for generating an operating frequency, and comprising a light source (12), means for modulating the light source output at the operating frequency, and a feedback loop responsive to the light modulation and arranged to provide positive feedback to the modulating means, characterised in that the feedback loop includes:
Dependencies are inferred from the claim text.