Optitune Plc

Abdul H Damirji

Yakov Sidorin

Salah A Al-Chalabi

In a tunable optical source, a diffraction deviceis used to provide wavelength selective feedback to a laser diode. The diffraction deviceis 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 deviceto 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 device. The diffraction devicecan be mounted in free space in an external cavity with respect to the laser diode. Novel forms of diffraction deviceare described. Tunable optical sources of this type can be used for instance in communications, particularly wavelength division multiplexing.

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London, United Kingdom

Abdul H Damirji