JPS6420506A - Optical filter - Google Patents

Optical filter

Info

Publication number
JPS6420506A
JPS6420506A JP17668087A JP17668087A JPS6420506A JP S6420506 A JPS6420506 A JP S6420506A JP 17668087 A JP17668087 A JP 17668087A JP 17668087 A JP17668087 A JP 17668087A JP S6420506 A JPS6420506 A JP S6420506A
Authority
JP
Japan
Prior art keywords
terminals
input
output terminals
light
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP17668087A
Other languages
Japanese (ja)
Inventor
Takashi Habara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP17668087A priority Critical patent/JPS6420506A/en
Publication of JPS6420506A publication Critical patent/JPS6420506A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2861—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using fibre optic delay lines and optical elements associated with them, e.g. for use in signal processing, e.g. filtering
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

PURPOSE:To flexibly set the position of the pole of a frequency characteristic and to eliminate light signal loss, by connecting light delay lines between (N-1) terminals in N input terminals and N output terminals, and setting remaining terminals as a signal input and a signal output terminals. CONSTITUTION:The input terminal 51 that is one of the input terminals 51-54 of an optical star coupler is set as the signal input terminal 14, and a light power inputted to the terminal 51 is divided to 1/4, and divided light powers are outputted to the output terminals 61-64. One of the output terminals is set as the signal output terminal 15, and other output terminals 62-64 are con nected to the input terminals 52-54, respectively via the light delay lines 71-73. And the position of the pole can be given by the solution of an equation Z<3>-ca1 Z<2>-ca2Z-ca3=0. Here, c=1/N=1/4, and (a1-a3) represent amplification degrees. Therefore, by setting amplifiers (a1-a3) appropriately, the position of the pole can be set flexibly.
JP17668087A 1987-07-15 1987-07-15 Optical filter Pending JPS6420506A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17668087A JPS6420506A (en) 1987-07-15 1987-07-15 Optical filter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17668087A JPS6420506A (en) 1987-07-15 1987-07-15 Optical filter

Publications (1)

Publication Number Publication Date
JPS6420506A true JPS6420506A (en) 1989-01-24

Family

ID=16017844

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17668087A Pending JPS6420506A (en) 1987-07-15 1987-07-15 Optical filter

Country Status (1)

Country Link
JP (1) JPS6420506A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0591042A1 (en) * 1992-09-29 1994-04-06 Nippon Telegraph And Telephone Corporation Arrayed-wave guide grating multi/demultiplexer with loop-back optical paths

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0591042A1 (en) * 1992-09-29 1994-04-06 Nippon Telegraph And Telephone Corporation Arrayed-wave guide grating multi/demultiplexer with loop-back optical paths
US5414548A (en) * 1992-09-29 1995-05-09 Nippon Telegraph And Telephone Corporation Arrayed-wave guide grating multi/demultiplexer with loop-back optical paths

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