Optical attenuator and method of making same

Details Optical attenuator and method of making same Optical attenuator and method of making same

G - Physics

02

B

G02B 26/02 (2006.01) H04B 10/12 (2006.01)

Patent

CA 2306305

A compact, tunable, wavelength independent, all-fiber attenuator is produced by heating a single-mode fiber to create at least a section of optical fiber having an expanded mode field therein. The attenuator may be tuned to achieve the desired value of attenuation and wavelength independence by imparting a small bend to the section having an expanded mode filed. An expanded mode field section can be achieved in ways other than heating the fiber, however using an optical fibre having a thermally expanded core section is preferred. The attenuator may be a fixed value attenuator or a variable attenuator. When a fixed value attenuator is desired, the expanded core section is bent suitably and the structure is encapsulated in an adhesive and glued onto a substrate. The mode field of the expanded core optical fibre should have substantially no attenuation when the expanded mode field portion of the optical fibre is un-bent.

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