Zervas, Mikhail N. and Laming, Richard I.
Passive, wavelength self-adjusting and tracking optical filter
Optical Amplifiers and Their Applications.
Optical Society of America
(OSA Technical Digest Series, 14).
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A passive, self-adjusted filter is presented which consists of an unpumped, twin-core erbium-doped fibre. The filter characteristics depend on the fibre and optical parameters. For a fibre NA of 0.3, the optimum filter performance is achieved for average optical powers of about 0dBm (+ or - 3dB). The device can also operate as a soliton sliding filter providing a filter centre-wavelength offset of ~0.1nm from the incoming centre wavelength.
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