Apparatus and method for measuring polarization dependent loss

Details Apparatus and method for measuring polarization dependent loss Apparatus and method for measuring polarization dependent loss

G - Physics

01

M

G01M 11/00 (2006.01)

Patent

CA 2368255

An apparatus for measuring polarization dependent loss is disclosed featuring several fiber optic couplers combined in tandem and oriented such that the PDL noise of the measurement system is reduced to a negligible level. By matching the PDLs of the couplers and vectorally subtracting opposite phases of polarization, the PDL of the measurement system is virtually eliminated. Thus, the PDL noise floor is lowered to near zero and the PDL of the optical device- under-test (DUT) can be accurately measured. The system is relatively inexpensive to implement and offers needed versatility because it measures the PDL of optical devices that operate in a reflection mode or in a forward transmission mode. Thus, it provides one PDL measurement solution for both types of devices.

Cet appareil permettant de mesurer une déperdition dépendant de la polarisation comporte plusieurs coupleurs de fibres optiques combinés en tandem et orientés de manière que le bruit de déperdition dépendant de la polarisation (PDL) du système de mesure soit ramené à un niveau négligeable. Le fait de mettre en concordance les PDL des coupleurs et de soustraire de manière vectorielle des phases opposées de polarisation permet d'éliminer quasiment le PDL du système de mesure. De la sorte, le bruit de fond de PDL devient presque nul et celui du dispositif optique à l'essai (DUT) peut être mesuré avec précision. Ce système est relativement peu onéreux et est également polyvalent dans la mesure où il permet de mesurer le PDL de dispositifs optiques fonctionnant en mode de réflexion ou en mode de transmission vers l'avant. Ce système apporte une solution en matière de mesure de ces deux types de dispositifs.

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