Patent
1985-06-24
1988-11-01
Lee, John
350 9615, 350 9629, G02B 634
Patent
active
047814284
ABSTRACT:
Optical energy at a predetermined frequency or narrow band of frequencies is tapped from an optical fibre by causing spatially periodic deformation of the fibre such as to produce coupling of optical energy between modes of the fibre, for example between the core and cladding of a single mode fibre, at the predetermined frequency and removing the optical energy at the predetermined frequency, for example by means of a cladding mode tap for a single mode fibre. If the deformation means includes a mechanical grating then tuning of the coupling frequency can be achieved by changing the relative orientation (O) of the fibre and the grating.
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Brambley Roger J.
Epworth Richard E.
Smith David F.
Wright Stephen
Lee John
STC PLC
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