Title:
波長分割多重化システムに対する信号付加
Document Type and Number:
Japanese Patent JP2004531960
Kind Code:
A
Abstract:
A telecommunications system is formed from a single mode optical fiber carrying Wave Division Multiplex (WDM) traffic. A transmission fiber coupler is arranged to couple signals from channels to be added to the single mode optical fiber. A coupler connects the channels carrying the signals to be added to the input of an optical amplifier, the output of the amplifier being connected in series to the transmission fiber coupler by a switchable multiband band-stop filter arranged to pass only signals having the wavelength of a signal or signals to be added to the WDM traffic. The switchable multiband band-stop filter may be a fiber Bragg filter, a selectable stack of filters or an assembly of bleachable filters. A switchable multiband filter is formed from a stack of layers of a semiconductor bleachable medium whereby the bleaching threshold is that of each single layer and the attenuation is the sum of the transmissions through all the layers comprising the stack.
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Inventors:
Good fellow robert charles
Application Number:
JP2002590558A
Publication Date:
October 14, 2004
Filing Date:
February 11, 2002
Export Citation:
Assignee:
Marconi UK Intellectual Property Limited
International Classes:
H04J14/00; G02B6/34; G02B26/00; G02F1/017; H04B10/213; H04J14/02; H04Q11/00; G02B6/12; (IPC1-7): H04J14/00; H04J14/02
Domestic Patent References:
| JPH11174499A | 1999-07-02 | |||
| JP2000023208A | 2000-01-21 | |||
| JPH09179147A | 1997-07-11 | |||
| JPH08237203A | 1996-09-13 | |||
| JPH03287237A | 1991-12-17 | |||
| JPH11289296A | 1999-10-19 | |||
| JPH11127121A | 1999-05-11 |
Attorney, Agent or Firm:
Sadao Kumakura
Fumiaki Otsuka
Toshio Imajo
Takaki Nishijima
Fumiaki Otsuka
Toshio Imajo
Takaki Nishijima