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AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsWei-Ping Huang, Tomas Adeback, Jan Magnusson
Estimating the term…
In a device (100) for continuously varying the extinction ratio, ER, a laser diode (102) is connected to a first end of a PZ fiber (108). At a second end, the PZ fiber is connected to a connector (110). At the other end of the connector a PM fiber (106) is connected. The two fibers meet in the connector, which means that opposite end facets of the fibers are located at a very close distance of each other. A rotation is produced by a rotator (104), mechanically coupled to the connector. The device can be used for: selecting a desired ER of the PM fiber; achieving high accuracy of angular alignment between the principal axes of two PM fibers (106, 506); evaluating the quality of angular alignment of a splice between two PM fibers made by a splicer; and setting the adjustment/calibration of PM fiber.
A device (100) for providing polarized light having a selectable extinction ratio, ER, at an output of a first optical fiber (106), the device comprising a source (102) of light, an auxiliary fiber (108) and said first optical fiber (106), each of the fibers having end facets, the auxiliary fiber (108) being connected to the source of light and the fibers being rotatable in relation to each other, characterized by a connector (110), an end facet of the auxiliary fiber (108) and an end facet of the first fiber (106) meeting in the connector (110) in which the fiber facets are rotatable in relation to each other, thereby continuously varying the extinction ratio of the polarized light at the output of the first optical fiber, said auxiliary fiber (108) being a polarizing (PZ) fiber and said first optical fiber (106) being a polarization maintaining (PM) optical fiber.
A device according to any of the preceding claims, characterized in that the connector is an FC/PC optical fiber connector.
A device according to any of the preceding claims, characterized in that the connector comprises V-grooves to transversely align the ends of the two fibers.
A device according to any of the preceding claims, characterized in that the source of light is a fiber pigtailed laser diode.
A method for producing polarized light having a selectable extinction ratio, ER, characterized by the steps of:
A method according to claim 14, characterized by the step of repeating the steps in claim 15 for different selected extinction ratios, ERs.
A method according to claim 16, characterized in that the steps in claim 18 are repeated for different selected extinction ratios, ERs.
Dependencies are inferred from the claim text.