Spatially variable filter laser wavelength monitoring/control

Details Spatially variable filter laser wavelength monitoring/control Spatially variable filter laser wavelength monitoring/control

H - Electricity

04

B

H04B 10/145 (2006.01) H01S 5/0687 (2006.01) H04B 10/155 (2006.01) H01S 5/0683 (2006.01)

Patent

CA 2310493

A feedback controlled laser diode communication device is disclosed that, as is common, has a laser diode that is modulated in response to an input signal to generate an optical signal, encoding the input signal. Spatially variable passband filter material, however, is arranged to receive at least a portion of the optical signal generated by the laser diode, preferably from the rear facet, and at least one detector is used to detect the thus filtered optical signal. Control circuitry then controls a wavelength of the laser diode based upon the response of the detector(s) to thus provide feedback control. As such, the device is particularly applicable to maintaining the tight channel spacings found in wavelength division multiplexed systems.

L'invention concerne un dispositif de communication par diode laser à boucle de rétroaction qui, comme c'est souvent le cas, comporte une diode laser modulée en réponse à un signal d'entrée afin de générer un signal optique, codant le signal d'entrée. Un matériel de filtre passe-bande variable spatialement est, toutefois, conçu pour recevoir au moins une partie du signal optique généré par la diode laser, de préférence à partir de la facette arrière, au moins un détecteur étant utilisé pour détecter le signal optique ainsi filtré. Des circuits de commande commandent ensuite une longueur d'onde de la diode laser sur la base de la réponse du ou des détecteurs en vue d'obtenir une rétroaction. Ainsi, ce dispositif sert en particulier à maintenir l'espacement étroit des voies de systèmes multiplexés en longueur d'onde.

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