Method and circuit for detecting laser mode hop

Details Method and circuit for detecting laser mode hop Method and circuit for detecting laser mode hop

G - Physics

01

M

G01M 11/00 (2006.01) G01M 11/02 (2006.01) H04B 10/08 (2006.01)

Patent

CA 2222002

A circuit and method of detecting mode hop in a tunable laser is provided wherein input light is tapped from the laser and is passed through a Fabry Perot etalon. An output signal from the Fabry Perot etalon and a reference signal are converted to electrical signals producing a single output electrical signal. This signal is provided to differentiator circuit, which is capable of detecting voltage spikes indicative of mode hop. The circuit is also utilized in a novel test system of this invention.

Un circuit et un mode de détection des changements de mode dans un laser accordable sont présentés ci-dessous, dans lesquels la lumière d'entrée est prélevée du laser et acheminée à travers un étalon Fabry-Pérot. Un signal de sortie de l'étalon Fabry-Pérot ainsi qu'un signal de référence sont converties en signaux électriques produisant un seul signal électrique en sortie. Ce signal est appliqué à un circuit de différentiation capable de relever les pointes de tension qui accompagnent un changement de mode. Le circuit est également utilisé dans un système d'essai nouveau de cette invention.

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