| 摘要 |
Optical circuits for optical amplifier input and output stages are described. The input stage circuit ( 42 ) comprises a first optical waveguide ( 46 ) for carrying a signal beam to be amplified, a second optical waveguide ( 62 ) for carrying a pump beam, a beam combining means ( 58 ) optically coupled to the first and second optical waveguides ( 46, 62 ) for producing a combined signal/pump beam, and means for optically coupling the combined signal/pump beam into an amplifying optical fibre ( 63 ). The output stage circuit ( 44 ) comprises a first output optical waveguide ( 64 ), an optical fibre attachment means arranged to receive an amplifying optical fibre ( 63 ) and an optical fibre attachment means arranged to receive an output optical fibre ( 76 ) wherein light from the amplifying optical fibre ( 63 ) is optically coupled to the output optical fibre ( 76 ) via the first output optical waveguide ( 64 ). The first and second optical waveguides ( 46, 62 ) and the first output optical waveguide ( 64 ) are hollow core optical waveguides formed as channels in a substrate. A fibre amplifier, in particular an erbium doped fibre amplifier, comprising such optical circuits is also described.
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