Back to results
US 2002/0159117 A1Published application
Optical add/drop device
AssigneeFujitsu Limited
InventorsIchiro Nakajima, Satoshi Kuroyanagi
Life of this patent
Estimating the term…
Abstract
Disclosed herein is an optical add/drop device including an optical demultiplexer for separating WDM signal light into n optical signals where n is an integer not less than 2, n first optical switches to which the n optical signals output from the optical demultiplexer are supplied, respectively, a second optical switch for adding provided on the input side of the first optical switches, a third optical switch for dropping provided on the output side of the first optical switches, n regenerators for wavelength converting the optical signals passed through the first optical switches, and an optical multiplexer for wavelength division multiplexing the wavelength-converted optical signals. A transmission distance between nodes can be increased by using this device.
Claims8
An optical add/drop device comprising:
- an optical demultiplexer for separating WDM signal light into n (n is an integer satisfying 1<n) optical signals having different wavelengths, said WDM signal light being obtained by wavelength division multiplexing said n optical signals;
- n first optical switches each having first and second input ports and first and second output ports, said n optical signals output from said optical demultiplexer being supplied to said first input ports of said n first optical switches, respectively;
- a second optical switch having k (k is a natural number) input ports and n output ports, an optical signal to be added being supplied to at least one of said k input ports of said second optical switch, said n output ports of said second optical switch being connected to said second input ports of said n first optical switches, respectively;
- n regenerators connected to said first output ports of said n first optical switches, respectively;
- an optical multiplexer for wavelength division multiplexing optical signals output from said n regenerators;
- and
- a third optical switch having n input ports and k output ports, said n input ports of said third optical switch being connected to said second output ports of said n first optical switches, respectively, an optical signal to be dropped being output from at least one of said k output ports of said third optical switch.
4 more elements
An optical add/drop device comprising:
- an optical demultiplexer for separating WDM signal light into n (n is an integer satisfying 1<n) optical signals having different wavelengths, said WDM signal light being obtained by wavelength division multiplexing said n optical signals;
- n optical switches each having first and second input ports and first and second output ports, said n optical signals output from said optical demultiplexer being supplied to said first input ports of said n optical switches, respectively;
- a first electrical switch having k (k is a natural number) input ports, s (s is a natural number) input ports, and n output ports;
- k first opto/electrical converters connected to said k input ports of said first electrical switch, respectively;
- n first electro/optical converters for connecting said n output ports of said first electrical switch and said second input ports of said n optical switches, respectively;
- an optical multiplexer for wavelength division multiplexing optical signals output from said first output ports of said n optical switches;
- a second electrical switch having n input ports, k output ports, and s output ports;
- n second opto/electrical converters for connecting said n input ports of said second electrical switch and said second output ports of said n optical switches, respectively;
- k second electro/optical converters connected to said k output ports of said second electrical switch, respectively;
- and
- s electrical links for connecting said s input ports of said first electrical switch and said s output ports of said second electrical switch, respectively.
8 more elements
An optical add/drop device comprising:
- an optical demultiplexer for separating WDM signal light into n (n is an integer satisfying 1<n) optical signals having different wavelengths, said WDM signal light being obtained by wavelength division multiplexing said n optical signals;
- n optical switches each having first and second input ports and first and second output ports, said n optical signals output from said optical demultiplexer being supplied to said first input ports of said n optical switches, respectively;
- a first electrical switch having k (k is a natural number) input ports, s (s is a natural number) input ports, and n output ports;
- (k+s) first opto/electrical converters connected to said (k+s) input ports of said first electrical switch, respectively;
- n first electro/optical converters for connecting said n output ports of said first electrical switch and said second input ports of said n optical switches, respectively;
- an optical multiplexer for wavelength division multiplexing optical signals output from said first output ports of said n optical switches;
- a second electrical switch having n input ports, k output ports, and s output ports;
- n second opto/electrical converters for connecting said n input ports of said second electrical switch and said second output ports of said n optical switches, respectively;
- (k+s) second electro/optical converters connected to said (k+s) output ports of said second electrical switch, respectively;
- and
- s optical links for connecting said first opto/electrical converters respectively corresponding to said s input ports of said first electrical switch and said second electro/optical converters respectively corresponding to said s output ports of said second electrical switch, respectively.
8 more elements
An optical add/drop device adapted to first and second optical paths, comprising:
- first and second optical add/drop units connected to said first and second optical paths, respectively;
- an add switch for selectively adding an optical signal to any one of said first and second optical add/drop units;
- and
- a drop switch for selectively dropping an optical signal from any one of said first and second optical add/drop units;
- each of said first and second optical add/drop units comprising:
- an optical demultiplexer for separating WDM signal light into n (n is an integer satisfying 1<n) optical signals having different wavelengths, said WDM signal light being obtained by wavelength division multiplexing said n optical signals;
- n optical switches each having first and second input ports and first and second output ports, said n optical signals output from said optical demultiplexer being supplied to said first input ports of said n optical switches, respectively;
- n regenerators connected to said first output ports of said n optical switches, respectively;
- and
- an optical multiplexer for wavelength division multiplexing optical signals output from said n regenerators;
- said add switch being connected to said second input ports of said n optical switches;
- said drop switch being connected to said second output ports of said n optical switches.
9 more elements
Dependencies are inferred from the claim text.