Light source stabilisation

Details Light source stabilisation Light source stabilisation

2007-07-31

2007-07-31

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

C356S035500

Reexamination Certificate

active

10514864

ABSTRACT:
An apparatus for sensing data from a remote optical sensor16has its frequency stabilised by balancing the outputs of narrow band filter28 30, spaced about a desired frequency36positioned at about the 3 db down points40of a broad band light source10using voltage control, current control or temperature control to vary the frequency of the wide band light source10. Difference between the outputs through the two narrow band filters28 30can be used to drive an amplifier48to correct the frequency of the broad band light source. The outputs through the two narrow band filters28 30can be converted52to binary numbers and fed to a microprocessor56which is used, via analog conversion60, to drive the amplifier48. The broad band light source10can be pulse modulated68to provide temporally separate light pulses92 94through each of the narrow band filters28 30,measured at separate times. The corrective output to the amplifier48can be governed by a ratio between the outputs through the narrow band filters28 30rather than by a difference there between.

REFERENCES:
patent: 5963321 (1999-10-01), Wang

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