Title:
OPTICAL DEVICE, TERMINAL STATION APPARATUS AND SYSTEM FOR WAVELENGTH DIVISION MULTIPLEX
Document Type and Number:
WIPO Patent Application WO/2000/070380
Kind Code:
A1
Abstract:
There are provided an optical device, a terminal station apparatus and a system for wavelength division multiplex. An optical device comprises a WDM port, a specific port to which is allocated an intermediate wavelength between a long-wavelength group and a short-wavelength group, a plurality of ports to which are allocated those wavelength groups described above, and first to fourth optical filters. The WDM port is coupled with the first optical filter; the first optical filter is coupled with the specific port and the second optical filter; the second optical filter is coupled with the third and fourth optical filters; and the third and fourth optical filters are coupled, respectively, with the ports of the long- and short-wavelength groups. Since this configuration allows the specific wavelength to coincide with the cutoff wavelength of the second optical filter, the second optical filter can be manufactured easily. In addition, the insertion losses become relatively uniform for all frequencies.
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Inventors:
KUBO TERUHIRO (JP)
Application Number:
PCT/JP1999/002500
Publication Date:
November 23, 2000
Filing Date:
May 14, 1999
Export Citation:
Assignee:
FUJITSU LTD (JP)
KUBO TERUHIRO (JP)
KUBO TERUHIRO (JP)
International Classes:
G02B6/34; H04J14/02; (IPC1-7): G02B6/293; H04J14/02
Foreign References:
| JPH10221561A | 1998-08-21 | |||
| JPH07333462A | 1995-12-22 | |||
| JPH10145298A | 1998-05-29 | |||
| JPH08195734A | 1996-07-30 | |||
| JPH09261205A | 1997-10-03 |
Attorney, Agent or Firm:
Matsumoto, Takashi (Akasaka 3-chome Minato-ku Tokyo, JP)
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