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US 2003/0169490 A1Published application
Wide band optical fiber amplifier
AssigneeSamsung Electronics Co., Ltd.
InventorsSeong-Taek Hwang, Kwan-Woong Song
Life of this patent
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Abstract
Disclosed is a wide band optical fiber amplifier for amplifying C and L-band optical signal components having an economical configuration, high amplification efficiency while exhibiting a low noise figure.
Claims15
A wide band optical fiber amplifier used in an optical transmission system, comprising:
- a first amplifying unit configured for amplifying an optical signal having C and L-band optical signal components;
- a distributor coupled to said first amplifying unit configured for receiving the amplified C and L-band optical signal components via a first path;
- a gain flattening filter coupled to said distributor for receiving said amplified C and L band optical signal components and for gain flattening only said amplified C band optical signal component;
- a first reflector coupled to said gain flattening filter for reflecting said amplified gain flattened C band optical signal component and said amplified L band optical signal component back into said distributor, via said gain flattening filter, said first reflector causing said gain flattened optical signal component to be gain flattened a second time;
- a second amplifying unit coupled to said distributor for receiving and amplifying the twice gain flattened amplified C band optical signal component and said amplified L-band optical signal component;
- the distributor further configured for receiving said amplified C and L band optical signal components and for splitting the amplified C and L band optical signal components into a separate amplified C and L band optical signal components;
- a third amplifying unit coupled to said distributor and configured for amplifying the separate amplified L-band optical signal component;
- a second reflector coupled to said third amplifying unit configured for reflecting the separate amplified L band optical signal component back to said distributor via said second amplifying unit;
- and
- the distributor further configured for combining the amplified separate amplified L band optical signal component with the separate amplified C band optical signal component and for outputting the combined signal.
7 more elements
A method for use in an optical communication system, said method directed to amplifying an optical signal comprised of a C band optical signal component and an L band optical signal component such that said amplification yields a high amplification efficiency while exhibiting a low noise figure, said method comprising the steps of:
- (1) amplifying said optical signal comprised of said C and L band optical signal components at a first amplification stage;
- (2) receiving, at a distribution stage, said amplified C and L-band optical signal components from said first amplification stage via a first path;
- (3) outputting from said distribution stage, said amplified C and L band optical signal components;
- (4) gain flattening, at a gain flattening stage, only said outputted C band optical signal component;
- (5) reflecting back to said gain flattening stage, said gain flattened C band optical signal component;
- (6) gain flattening again, at said gain flattening stage, said reflected back gain flattened C band optical signal component;
- (7) amplifying, at a second amplification stage, said twice gain flattened reflected back C band optical signal component and said reflected back L band optical signal component;
- (8) splitting said amplified C and L band optical signal components at step (7) into separate C and L band optical signal components;
- (9) outputting, from said distribution stage, said separate L-band optical signal component;
- (10) amplifying, at a third amplification stage, said separate L band optical signal component;
- (11) reflecting back said amplified separate L band optical signal component at step (10) to said distribution stage;
- (12) combining the reflected back amplified separate L band optical signal component at step (11) with said separate C band optical signal component at step (8) to form a combined optical signal;
- and
- (13) outputting the combined optical signal.
11 more elements
Dependencies are inferred from the claim text.