Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1998-09-23
2000-08-01
Lee, John D.
Coherent light generators
Particular beam control device
Optical output stabilization
372 38, H01S 313
Patent
active
060977434
ABSTRACT:
A wavelength division multiplexer (WDM) is used to transmit the output light from a superluminescent diode (SLD) over a band approximately equal to the full width half maximum (FWHM) SLD bandwidth and its output serves as an IFOG light source. The residual (uncoupled) spectrum contains two sidelobes, which are then separated by another WDM into a lower half centered around .lambda..sub.1 and an upper half centered around .lambda..sub.2. These sidelobes are detected and fed to a differential amplifier whose output is an error signal which is used in a feedback loop to control the SLD drive current or the drive current of a thermoelectric cooler (TEC) on which the SLD is mounted, both of which affect the SLD spectrum. The same results are achieved using the back output light of the SLD chip. An optical amplifier is also implemented by providing access to the front and rear faces of the SLD and splitting off a small portion of the light from one of the facets for the automatic adjustment.
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Burke William J.
Lee John D.
Sarnoff Corporation
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