Article comprising a distributed feedback laser

In some applications of distributed feedback (DFB) lasers, it is important that the coupling constant kappa be closely controlled. This is not easily achieved, frequently resulting in low yield of acceptable devices. I have discovered that variations in kappa can be reduced if the DFB laser is desig...

Full description

Saved in:
Bibliographic Details
Main Author ACKERMAN; DAVID A
Format Patent
LanguageEnglish
Published 07.06.1994
Edition5
Subjects
BASIC ELECTRIC ELEMENTS
DEVICES USING STIMULATED EMISSION
ELECTRICITY
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
PHYSICS
Online AccessGet full text

Cover

More Information
Summary:In some applications of distributed feedback (DFB) lasers, it is important that the coupling constant kappa be closely controlled. This is not easily achieved, frequently resulting in low yield of acceptable devices. I have discovered that variations in kappa can be reduced if the DFB laser is designed such that the thickness ts of a spacer layer (between the active layer and the Bragg grating) is within about +/-10% of the value to/(1- alpha ), where to is the modal decay length, and alpha is a parameter which characterizes the fractional variation of to with fractional changes in layer thickness.
Bibliography:Application Number: US19930043916