Agere Systems Guardian Corp.

Agere Systems Inc.

Kishore K Kamath

Ram Jambunathan

Daniel Paul Wilt

Lars E Eng

Alexander Robertson

John Evan Johnson

A low threshold distributed feedback (DFB) laser is constructed for improved performance at subzero temperatures. A loss grating is employed to enhance the probability that lasing occurs near the short wavelength side of the stopband and to counteract the effect of negative gain tilt that occurs when DFB lasers are positively detuned. A method of making DFB lasers from wafers with improved yield for low temperature side mode suppression ratio (SMSR) is also disclosed.

Low temperature distributed feedback laser with loss grating and method

The invention is a semiconductor device, and a method of fabrication, where a waveguide layer in which light is propagated and an integral photodetector are formed in the device. A light absorbing layer of the photodetector includes a portion of the waveguide layer which is modified to absorb a portion of the light while transmitting the remainder of the light. Additional components, such as a laser, optical amplifier and modulator can be included with the photodetector.

Optoelectronic device with power monitoring tap

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Whitehall, PA, United States of America

Kishore K Kamath