Feedback stabilized multi-mode and method of stabilizing a...

H - Electricity – 01 – S

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H01S 5/14 (2006.01) G02B 6/036 (2006.01) G02B 6/42 (2006.01)

Patent

CA 2483294

The laser assembly (10) comprises a multimode laser (12) having at least one output and operating at a given wavelength. It also includes a double-clad optical fiber (20) having a free end (22) coupled to the output of the laser (12). The optical fiber (20) comprises a core (24) in registry with the output of the laser (12), a multimode inner cladding (26) surrounding the core (24), and an outer cladding (28) surrounding the inner cladding (26), the outer cladding (28) being provided to contain light in the inner cladding (26). A fiber Bragg grating (30) is written in the core (24) of the fiber (20) at a given distance from the free end (22) thereof. The Bragg grating (30) has a reflection spectrum within the gain spectrum of the laser (12). In use, it generates a sufficient feedback and stabilizes the laser (12) at the reflection spectrum of the Bragg grating (30). This provides a low cost laser assembly that is simple, suitable for volume manufacturing and small in size.

Un ensemble laser (10) comprend un laser multimodal (12) possédant au moins une sortie et fonctionnant à une longueur d'ondes donnée. Il comprend également une fibre optique à double revêtement (20) ayant une extrémité libre (22) coulée à la sortie du laser (12). La fibre optique (20) comprend un noyau (24), en registre avec la sortie du laser (12), un revêtement interne multimodal (26) entourant l'âme (24), et un revêtement externe (28) entourant le revêtement interne (26), le revêtement externe (28) étant destiné à retenir la lumière dans le revêtement interne (26). Un réseau de fibres de Bragg (30) est formé dans l'âme (24) de la fibre (20), à une distance donnée de son extrémité libre (22). Le réseau de fibres de Bragg (30) possède un spectre de réflexion à l'intérieur du spectre de gain du laser (12). Pendant l'utilisation, il génère une rétroaction suffisante et stabilise le laser (12) dans le spectre de réflexion du réseau de fibres de Bragg (30). Cela permet d'obtenir un ensemble laser à faible coût qui est simple, adapté à la fabrication dans le volume et est de taille réduite.

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