JPS6450003A - Optical attenuator - Google Patents

Optical attenuator

Info

Publication number
JPS6450003A
JPS6450003A JP62207518A JP20751887A JPS6450003A JP S6450003 A JPS6450003 A JP S6450003A JP 62207518 A JP62207518 A JP 62207518A JP 20751887 A JP20751887 A JP 20751887A JP S6450003 A JPS6450003 A JP S6450003A
Authority
JP
Japan
Prior art keywords
diameter
fiber core
refractive index
small
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
JP62207518A
Other languages
Japanese (ja)
Inventor
Hironori Yamamoto
Naoki Kawada
Toshiji Takei
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.)
Seiko Instruments Inc
Original Assignee
Seiko Instruments Inc
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 Seiko Instruments Inc filed Critical Seiko Instruments Inc
Priority to JP62207518A priority Critical patent/JPS6450003A/en
Publication of JPS6450003A publication Critical patent/JPS6450003A/en
Pending legal-status Critical Current

Links

Landscapes

  • Light Guides In General And Applications Therefor (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

PURPOSE:To reduce the cost and size of an optical attenuator by partly exposing the fiber of an optical fiber, heating said part at the temp. sufficiently higher than the softening point and stretching the heated part until the small-diameter part has the size of about several times the fiber core diameter, then enclosing the small-diameter part with a material having the refractive index larger than the refractive index of the fiber core. CONSTITUTION:The optical fiber part 1a is heated at the temp. sufficiently higher than the softening point and is stretched until the part 1b to be reduced in the diameter by the stretching has the diameter of about several times the fiber core diameter. The small-diameter part 1b is enclosed by the material 4 having the refractive index higher than the refractive index of the fiber core part. Confinement of light by the fiber core is impaired at this time and the light propagating in the fiber core leaks from the small-diameter part 1b to the circumferential material 4. The optical attenuator having a desired attenuation rate is, therefore, obtd. by adequately selecting the amt. of the material 4 having the high refractive index. The need for an optical element and the need for an adjusting operation are thereby eliminated and the inexpensive and small-sized optical attenuator is obtd.
JP62207518A 1987-08-21 1987-08-21 Optical attenuator Pending JPS6450003A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62207518A JPS6450003A (en) 1987-08-21 1987-08-21 Optical attenuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62207518A JPS6450003A (en) 1987-08-21 1987-08-21 Optical attenuator

Publications (1)

Publication Number Publication Date
JPS6450003A true JPS6450003A (en) 1989-02-27

Family

ID=16541046

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62207518A Pending JPS6450003A (en) 1987-08-21 1987-08-21 Optical attenuator

Country Status (1)

Country Link
JP (1) JPS6450003A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01222205A (en) * 1988-03-01 1989-09-05 Fujitsu Ltd Optical attenuator
US5321790A (en) * 1991-10-11 1994-06-14 Seikoh Giken Co., Ltd. Optical attenuator using an optical fiber and method and apparatus for producing the same
US5694512A (en) * 1996-07-09 1997-12-02 Framatome Connectors Canada Inc. Compact tunable wavelength independent all-fiber optical attenuator and method of making same
US6490391B1 (en) 2000-07-12 2002-12-03 Oluma, Inc. Devices based on fibers engaged to substrates with grooves
US6501875B2 (en) 2000-06-27 2002-12-31 Oluma, Inc. Mach-Zehnder inteferometers and applications based on evanescent coupling through side-polished fiber coupling ports
US6516114B2 (en) 2000-06-27 2003-02-04 Oluma, Inc. Integration of fibers on substrates fabricated with grooves
US6542663B1 (en) 2000-09-07 2003-04-01 Oluma, Inc. Coupling control in side-polished fiber devices
US6571035B1 (en) 2000-08-10 2003-05-27 Oluma, Inc. Fiber optical switches based on optical evanescent coupling between two fibers
US6597833B1 (en) 2000-06-27 2003-07-22 Oluma, Inc. Wavelength-division multiplexers and demultiplexers based on mach-zehnder interferometers and evanescent coupling
US6621951B1 (en) 2000-06-27 2003-09-16 Oluma, Inc. Thin film structures in devices with a fiber on a substrate
US6621952B1 (en) 2000-08-10 2003-09-16 Oluma, Inc. In-fiber variable optical attenuators and modulators using index-changing liquid media
US6625349B2 (en) 2000-06-27 2003-09-23 Oluma, Inc. Evanescent optical coupling between a waveguide formed on a substrate and a side-polished fiber

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01222205A (en) * 1988-03-01 1989-09-05 Fujitsu Ltd Optical attenuator
US5321790A (en) * 1991-10-11 1994-06-14 Seikoh Giken Co., Ltd. Optical attenuator using an optical fiber and method and apparatus for producing the same
US5694512A (en) * 1996-07-09 1997-12-02 Framatome Connectors Canada Inc. Compact tunable wavelength independent all-fiber optical attenuator and method of making same
US6597833B1 (en) 2000-06-27 2003-07-22 Oluma, Inc. Wavelength-division multiplexers and demultiplexers based on mach-zehnder interferometers and evanescent coupling
US6501875B2 (en) 2000-06-27 2002-12-31 Oluma, Inc. Mach-Zehnder inteferometers and applications based on evanescent coupling through side-polished fiber coupling ports
US6516114B2 (en) 2000-06-27 2003-02-04 Oluma, Inc. Integration of fibers on substrates fabricated with grooves
US6625349B2 (en) 2000-06-27 2003-09-23 Oluma, Inc. Evanescent optical coupling between a waveguide formed on a substrate and a side-polished fiber
US6556746B1 (en) 2000-06-27 2003-04-29 Oluma, Inc. Integrated fiber devices based on Mach-Zehnder interferometers and evanescent optical coupling
US6621951B1 (en) 2000-06-27 2003-09-16 Oluma, Inc. Thin film structures in devices with a fiber on a substrate
US6490391B1 (en) 2000-07-12 2002-12-03 Oluma, Inc. Devices based on fibers engaged to substrates with grooves
US6690857B2 (en) 2000-07-12 2004-02-10 Oluma, Inc. Fiber devices having side evanescent coupling port
US6571035B1 (en) 2000-08-10 2003-05-27 Oluma, Inc. Fiber optical switches based on optical evanescent coupling between two fibers
US6621952B1 (en) 2000-08-10 2003-09-16 Oluma, Inc. In-fiber variable optical attenuators and modulators using index-changing liquid media
US6542663B1 (en) 2000-09-07 2003-04-01 Oluma, Inc. Coupling control in side-polished fiber devices

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