Optical amplifier

Details Optical amplifier Optical amplifier

2007-04-10

2007-04-10

Hellner, Mark (Department: 3663)

Optical: systems and elements

Optical amplifier

Particular active medium

Reexamination Certificate

active

10565016

ABSTRACT:
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.

REFERENCES:
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GB Search Report of GB 0317530.4, dated Jan. 19, 2004.
Miura et al., “Hollow Optical Waveguide for Temperature-Insensitive Photonic Integrated Circuits”, Japanese Journal of Applied Physics, vol. 40, No. 7A, Part 2, Jul. 1, 2001, pp. L688-L690, XP001077922.
McMullin et al., “Hollow Metallic Waveguides in Silicon V-Grooves”, IEEE Photonics Technology Letters, vol. 5, No. 9, Sep. 1, 1993, pp. 1080-1082, XP000414182.
Miura et al., “Propagation Characteristics of Hollow Optical Waveguide for Temperature-Insensitive Photonic Integrated Circuits”.

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