Optical amplifier stage
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Aug 1, 2002
app pub date -
Feb 7, 2002
filing date -
Feb 28, 2000
priority date (Note) -
Abandoned
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Abstract
An intermediate optical amplifier stage of an optical amplifier having cascaded amplifier stages includes an optical circulator having a first port forwardly coupled with a second port which is forwardly coupled with a third port, wherein the second port is optically coupled with an orthogonal polarisation state converting reflector via a length of optically pumped optically amplifying optical fibre. The orthogonal polarisation state converting reflector may be constituted by the series combination of a collimating lens, a Faraday rotator that provides a .pi./4 plane of polarisation rotation in respect of a single transit of light through the rotator, and a mirror. An alternative form of polarisation state converting reflector is constituted by a loop mirror having a polarisation beam-splitter/combiner having first and second ports optically coupled with third and fourth ports via an optical coupling region, wherein the third and fourth ports are optically coupled via a length of polarisation state maintaining optical waveguide incorporating a polarisation state conversion device that converts to the orthogonal polarisation state the polarisation state of light launched into it from either direction. The polarisation state conversion device may be constituted by an optical fibre splice formed between two pieces of polarisation maintaining fibre spliced together with the fast axis one fibre aligned with the slow axis of the other.
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Patent Owner(s)
Patent Owner | Address | |
---|---|---|
KING JONATHAN P | Not Provided |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Cordina, Kevin J | Lancs, GB | 10 | 32 |
Kean, Peter N | Devon, GB | 1 | 3 |
King, Jonathan P | Essex, GB | 12 | 140 |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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