JPS6450003A - Optical attenuator - Google Patents
Optical attenuatorInfo
- 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
Links
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Light Guides In General And Applications Therefor (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.
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)
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 |
US6621952B1 (en) | 2000-08-10 | 2003-09-16 | Oluma, Inc. | In-fiber variable optical attenuators and modulators using index-changing liquid media |
US6621951B1 (en) | 2000-06-27 | 2003-09-16 | Oluma, Inc. | Thin film structures in devices with a fiber on a substrate |
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 |
-
1987
- 1987-08-21 JP JP62207518A patent/JPS6450003A/en active Pending
Cited By (14)
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 |
US6621952B1 (en) | 2000-08-10 | 2003-09-16 | Oluma, Inc. | In-fiber variable optical attenuators and modulators using index-changing liquid media |
US6571035B1 (en) | 2000-08-10 | 2003-05-27 | Oluma, Inc. | Fiber optical switches based on optical evanescent coupling between two fibers |
US6542663B1 (en) | 2000-09-07 | 2003-04-01 | Oluma, Inc. | Coupling control in side-polished fiber devices |
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