Tunable filter

Details Tunable filter Tunable filter

2006-04-11

2006-04-11

Harvey, Minsun O (Department: 2828)

Coherent light generators

Particular beam control device

Tuning

C372S102000

Reexamination Certificate

active

07027469

ABSTRACT:
In a tunable optical source, a diffraction device115is used to provide wavelength selective feedback to a laser diode100. The diffraction device115is at least partially fabricated in a material whose refractive index is controllable so as to control the diffraction performance of the device. This allows the diffraction device115to be used in tuning the optical source, potentially without using moving parts. For instance, the refractive index can be controlled using a temperature change across material of the device115. The diffraction device115can be mounted in free space in an external cavity with respect to the laser diode100. Novel forms of diffraction device115are described. Tunable optical sources of this type can be used for instance in communications, particularly wavelength division multiplexing.

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