JPS55162036A - Delay difference measuring method for group between lp01 and lp11 mode beams of optical fiber to transmit lp01 and lp11 mode beams - Google Patents

Delay difference measuring method for group between lp01 and lp11 mode beams of optical fiber to transmit lp01 and lp11 mode beams

Info

Publication number
JPS55162036A
JPS55162036A JP7032979A JP7032979A JPS55162036A JP S55162036 A JPS55162036 A JP S55162036A JP 7032979 A JP7032979 A JP 7032979A JP 7032979 A JP7032979 A JP 7032979A JP S55162036 A JPS55162036 A JP S55162036A
Authority
JP
Japan
Prior art keywords
interference
mode
mode beams
beams
optical fiber
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.)
Granted
Application number
JP7032979A
Other languages
Japanese (ja)
Other versions
JPS5650213B2 (en
Inventor
Noburu Shibata
Mitsuhiro Tatsuta
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 JP7032979A priority Critical patent/JPS55162036A/en
Publication of JPS55162036A publication Critical patent/JPS55162036A/en
Publication of JPS5650213B2 publication Critical patent/JPS5650213B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
    • G01M11/331—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face by using interferometer
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)

Abstract

PURPOSE:To facilitate an easy measurement, by making the interference enable beams pass through the measured fiber for isolation into the LP01 and LP11 mode beams via the complex refraction polarizing element, giving the interference to these mode beams through the optical paths of different lengths and then measuring the group delay difference between both mode beams based on the optical path difference when the interference fringes becomes most clear. CONSTITUTION:Beam B which received the linear polarization and sent from light source 1 to emit interference enable beam A and interference enable light source 3 consisting of polarizer 2 enters via lens 4 measured optical fiber which transmits both the LP01 and LP11 mode beams. The radiation beam C is isolated into LP01 mode beam D and LP11 mode beam E via lens 6 and complex refraction polarizing element 7 each. Beam D is reflected by reflector 9 after passing through variable delay medium 8 to then enter compounder 10; while beam E enters compounder 10 via variable delay medium 11 and polarizer 11 each. Beam J which caused the interference at compounder 10 gives the interference fringes 14 onto projection secreen 13. Thus the group delay difference between the both mode beams of the measured optical fiber can be measured easily with a high accuracy based on the optical path difference when fringes 14 become most clear.
JP7032979A 1979-06-04 1979-06-04 Delay difference measuring method for group between lp01 and lp11 mode beams of optical fiber to transmit lp01 and lp11 mode beams Granted JPS55162036A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7032979A JPS55162036A (en) 1979-06-04 1979-06-04 Delay difference measuring method for group between lp01 and lp11 mode beams of optical fiber to transmit lp01 and lp11 mode beams

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7032979A JPS55162036A (en) 1979-06-04 1979-06-04 Delay difference measuring method for group between lp01 and lp11 mode beams of optical fiber to transmit lp01 and lp11 mode beams

Publications (2)

Publication Number Publication Date
JPS55162036A true JPS55162036A (en) 1980-12-17
JPS5650213B2 JPS5650213B2 (en) 1981-11-27

Family

ID=13428276

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7032979A Granted JPS55162036A (en) 1979-06-04 1979-06-04 Delay difference measuring method for group between lp01 and lp11 mode beams of optical fiber to transmit lp01 and lp11 mode beams

Country Status (1)

Country Link
JP (1) JPS55162036A (en)

Also Published As

Publication number Publication date
JPS5650213B2 (en) 1981-11-27

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