Wavelength sensitive device for wavelength stabilisation

摘要

A device for stabilising the operating wavelength ( lambda ) of an electro-optical component having a nominal operating wavelength ( lambda 0) by means of a wavelength influencing circuit (4, 5) adapted to be driven by a control signal. The device comprises a semiconductor photodiode (3) adapted to be impinged upon by the radiation generated and/or processed by the component and to generate an output signal which is indicative of a difference of the wavelength of the radiation (( lambda ) with respect to the nominal operating wavelength ( lambda 0, lambda i). The semiconductor photodiode (3) includes a plurality of layers jointly defining two opposite diodes generating opposite photocurrents as a result of radiation impinging onto the photodiode (3). The opposite photocurrents are adapted to generate the control signal to effect the stabilisation action.