JPS5473657A - Measuring method of propagation time difference of optical pulse in preform for optical fiber - Google Patents

Measuring method of propagation time difference of optical pulse in preform for optical fiber

Info

Publication number
JPS5473657A
JPS5473657A JP14059577A JP14059577A JPS5473657A JP S5473657 A JPS5473657 A JP S5473657A JP 14059577 A JP14059577 A JP 14059577A JP 14059577 A JP14059577 A JP 14059577A JP S5473657 A JPS5473657 A JP S5473657A
Authority
JP
Japan
Prior art keywords
optical
preform
pulse
propagation time
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.)
Pending
Application number
JP14059577A
Other languages
Japanese (ja)
Inventor
Yasuji Omori
Masao Kawachi
Takao Edahiro
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 JP14059577A priority Critical patent/JPS5473657A/en
Publication of JPS5473657A publication Critical patent/JPS5473657A/en
Pending legal-status Critical Current

Links

Landscapes

  • Light Guides In General And Applications Therefor (AREA)

Abstract

PURPOSE:To assess the propagation band range of optical fiber in the stage of preform, by entering ultrashort optical pulse laser into the preform, and measuring the propagation time by a detecting method having resolution less than several tens of picoseconds. CONSTITUTION:The optical pulse from a light source 1 is divided into optical path length adjusting part 30 and preform 6 by a half mirror 2, and mirrors 41, 41' are provided so as to intersect at right angle at an optical shutter 80 utilizing the optical Kerr effect. The optical shutter part 80 composes crossed Nicols with polarizers 81, 81', and the optical pulse from the preform 6 is passed only when the optical pulse comes from the optical path length adjusting part 30. Adjusting an inching stage 7 or 32, by measuring the difference in propagation time of lower- order mode pulse and higher-order mode pulse through the preform 6 at an optical detector 90, the transmission characteristics of the optical fiber may be assessed, so that the efficiency may be enhanced.
JP14059577A 1977-11-25 1977-11-25 Measuring method of propagation time difference of optical pulse in preform for optical fiber Pending JPS5473657A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14059577A JPS5473657A (en) 1977-11-25 1977-11-25 Measuring method of propagation time difference of optical pulse in preform for optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14059577A JPS5473657A (en) 1977-11-25 1977-11-25 Measuring method of propagation time difference of optical pulse in preform for optical fiber

Publications (1)

Publication Number Publication Date
JPS5473657A true JPS5473657A (en) 1979-06-13

Family

ID=15272340

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14059577A Pending JPS5473657A (en) 1977-11-25 1977-11-25 Measuring method of propagation time difference of optical pulse in preform for optical fiber

Country Status (1)

Country Link
JP (1) JPS5473657A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6081335A (en) * 1997-06-25 2000-06-27 Nec Corporation Phase difference measuring device with visible light source for providing easy alignment of optical axes and method therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6081335A (en) * 1997-06-25 2000-06-27 Nec Corporation Phase difference measuring device with visible light source for providing easy alignment of optical axes and method therefor

Similar Documents

Publication Publication Date Title
WO1998031299A3 (en) Method for producing a synthetic eye lens
JPS5238939A (en) Optical coupler
JPS56100324A (en) Measuring device for light dispersion
JPS5473657A (en) Measuring method of propagation time difference of optical pulse in preform for optical fiber
JPS5582032A (en) Out-off wavelength measuring method for lp11 mode in optical fiber and measuring unit
JPS5685701A (en) Optical branching filter
JPS55103518A (en) 3-terminal light circulator
JPS5473062A (en) Thin-film mirror type optical branch line
JPS5533129A (en) Light variable attenuator
JPS5492281A (en) Light attenuator
JPS5362546A (en) Measuring method and apparatus of propagation characteristics of optical guide
JPS573020A (en) Temperature measuring method
JPS5435757A (en) Measuring method of refractive index distribution of optical fibers
JPS5435759A (en) Measuring method of numerical aperture of optical fibers
JPS533349A (en) Devider for optical fiber and photo coupler
JPS5521077A (en) Photo switch
JPS5342052A (en) Optical signal detector
JPS57198425A (en) Optical branching and coupling circuit
JPS55163470A (en) Measuring method for delay time of laser range finding system
JPS5390747A (en) Polarization inversion type light modulator
ATE7962T1 (en) REFRACTOMETER USING THE LIMITING ANGLE METHOD.
JPS5647738A (en) Turbidimeter
JPS56137138A (en) Optical sensor
JPS5387746A (en) Optical path changer of hollow waveguide
JPS53112758A (en) Photo attenuator

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20040622

A601 Written request for extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A601

Effective date: 20040916

A602 Written permission of extension of time

Free format text: JAPANESE INTERMEDIATE CODE: A602

Effective date: 20041101

A521 Written amendment

Effective date: 20041222

Free format text: JAPANESE INTERMEDIATE CODE: A523

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20060131