Optical Fiber Dispersion Compensation by Chirped Fiber Bragg Grating

１ＩｎｔｒｏｄｕｃｔｉｏｎＵｓｉｎｇｄｉｓｐｅｒｓｉｏｎｃｏｍｐｅｎｓａｔｉｎｇｔｅｃｈｎｉｑｕｅｓｔｏｕｐｇｒａｄｅｔｈｅｅｘｉｓｔｉｎｇｎｏｎｄｉｓｐｅｒｓｉｏｎｓｈｉｆｔｅｄｆｉｂｅｒ（ＮＤＳＦ）ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓｙｓｔｅｍｉ...     

Soliton Transmission Research on using Dispersion Step Fiber Chain Instead of Soliton Fiber

ＳｏｌｉｔｏｎＴｒａｎｓｍｉｓｉｏｎＲｅｓｅａｒｃｈｏｎｕｓｉｎｇＤｉｓｐｅｒｓｉｏｎＳｔｅｐＦｉｂｅｒＣｈａｉｎＩｎｓｔｅａｄｏｆＳｏｌｉｔｏｎＦｉｂｅｒＹＵＪｉａｎｊｕｎＹＡＮＧＢｏｊｕｎ＋ＧＵＡＮＫｅｊｉａｎＹＡＮＧＱｉｍｉｎＺＨＡＮＧＸｉａ...     

Linewidth of Semiconductor-Optical Fiber Ring External Cavity Laser with Tunable Optical Fiber F-P Cavity

１ＩｎｔｒｏｄｕｃｔｉｏｎＮａｒｏｗｌｉｎｅｗｉｄｔｈｔｕｎａｂｌｅｓｉｎｇｌｅｆｒｅｑｕｅｎｃｙｓｅｍｉｃｏｎｄｕｃｔｏｒｌａｓｅｒｓａｒｅｎｅｄｆｏｒａｐｐｌｉｃａｔｉｏｎｓｉｎｃｏｈｅｒｅｎｔｃｏｍｍｕｎｉｃａｔｉｏｎ，ｃｏｈｅｒｅｎｔｄｅ...     

Fiber taper coupled high-quality-factor planar microdisk

A fiber taper can evanescently couple to whispering gallery modes (WGMs) in a planar silica microdisk for observing the optical properties of the microdisk cavity.It is revealed that WGMs have very high quality (Q) factors by controlling the air gap between the taper and the microdisk.The best coupling efficiency from the taper to the microdisk is as high as 98%,and can be continuously adjusted from the under-coupling,critical-coupling to over-coupling regimes.The influence of the laboratory circumstance such as surface contamination on the microdisk is also discussed.It is experimentally shown that the high-Q-factor (10~5) modes can be kept for a long period in a general laboratory circumstance.     

Interfacial Tension and Fiber Lifetime of Ionomer‐Compatibilized Blends Investigated by Embedded Fiber Retraction

Embedded fiber retraction was used to investigate the interfacial tension and fiber lifetime of an immiscible polyester/polyamide system, with and without ionic functionality incorporated onto the polyester as compatibilizing groups. The ionic groups reduce the interfacial tension of the system from 7.55 dyne/cm to 1.49 dyne/cm when incorporated at 5.5 mole% into the polyester. In addition, fiber lifetime increased by a factor of 4–5 with the incorporation of ionic functionality. These results correlate extremely well with previously published observations of the ionomer‐compatibilized blends and confirm the influence of interfacial tension on blend morphology. The initial aspect ratio of the fiber should be between three and 12 for consistent and reproducible results.     

120 nm Bandwidth Erbium-doped Fiber Amplifier

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ａｎｏｎｇｏｉｎｇｃｈａｌｌｅｎｇｅｉｎｔｈｅｏｐｔｉｃａｌｃｏｍｍｕｎｉｃａｔｉｏｎｓｉｓｔｏｍａｘｉｍｉｓｅｔｈｅｄａｔａｔｒａｎｓｍｉｓｓｉｏｎｃａｐａｃｉｔｙｏｆａｓｉｎｇｌｅｆｉｂｅｒ.ＴｈｅｉｎｔｒｏｄｕｃｔｉｏｎｏｆｍｕｌｔｉｐｌｅｃｈａｎｎｅｌｓｔｈｒｏｕｇｈＤｅｎｓｅＷａｖｅｌｅｎｇｔｈＤｉｖｉｓｉｏｎＭｕｌｔｉｐｌｅｘｉｎｇ(ＤＷＤＭ )ｓｙｓｔｅｍｓｈａｓｇｒｅａｔｌｙｉｍｐｒｏｖｅｄｔｈｉｓｃａｐａｃｉｔｙ ,ｂｅｃａｕｓｅｏｆｔｈｅｓｔｅａｄｙ…     

Bend Sensing with Temperature-insensitive Long-period Fiber Grating

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｌｏｎｇ ｐｅｒｉｏｄｆｉｂｅｒ ｇｒａｔｉｎｇｓ (ＬＰＧｓ )ｒｅｃｅｎｔｌｙａｔｔｒａｃｔｅｄｍｕｃｈａｔｔｅｎｔｉｏｎｆｏｒｕｓｅｉｎｏｐｔｉｃａｌｓｅｎｓｉｎｇａｐｐｌｉｃａｔｉｏｎｓ[1,2 ] .Ｔｈｅｙａｒｅｕｓｅｄａｓｓｅｎｓｉｎｇｃｏｍｐｏｎｅｎｔｓｔｏｍｅａｓｕｒｅｔｅｍｐｅｒａｔｕｒｅ ,ｓｔｒａｉｎａｎｄｂｅｎｄｉｎｇｏｆｆｉｂｅｒ .Ｈｏｗｅｖｅｒ ,ｍｉｎｉｍｉｚｉｎｇｔｈｅｃｒｏｓｓｔａｌｋｂｅｔｗｅｅｎｄｉｆｆｅｒｅｎｔｍｅａｓｕｒａｎｄｓ,ｅｓｐｅｃ…     

Temporal Soliton Propagation in Nonlinear Fiber Gratings

Reccntly,thec]9ctrol13:lgrlcticProPcl'ticsinn0nIinearpcriodicstructurchavebcenexten-sively8tudiedW.ChenandD.L.A/[illsdeIn0nstratedthecxisting0fs0-cal1cdgaps0litoninnon1inearpcri0dicstructure[1J,thcsegapsolit0nsarespatiaIs0lit0ns.'Latterstudiesshowedthatthegaps0litonis0nlyakind0fspecialcflsc0fBraggs0Iiton\\'hichcanm0vewithanyve-locitybelox\'t[1egroLlpvcI0city[2,3j.Thcse.solit0nscxistinthcresonantcase,i-e-,thestr0ngcouplingbctxvcentt1cfor\\':lI'<1112odcanLIthcback\\'ardm0dc.Inthiscasc,the…     

Optic Fiber Interferometer for Absolute Distance Measurement

1.IntroductionAbsolutedistancemeasurementisfarfromanewtopic.However,itisstillafieldstimulatinggreatinterestsnowadaysduetoitSimportantroleinmanufacturingandassembly['J.SincethegreatsuccessachievedbyMichelsonandBenoitwhentheyfirstdevelopedaninterferometertodeterminethestandardmeterintermsofthemonochromaticredcadmiumline,theopticinterferometerhasbeenprovedtobeoneofthemostpreciseandefficientwayindisplacementmeasurementbecauseofitshighdiscriminationandsimplestructure.However,thetraditionalinterfe…     

Fiber Bragg grating hydrophone with high sensitivity

A fiber Bragg grating(FBG)hydrophone with high sensitivity was demonstrated.This hydrophone used a rubber diaphragm and a copper hard core as the sensing element.To compensate the hydrostatic pressure, a capillary tube was fixed at the end of the hydrophone.Theoretical analysis of the acoustic pressure sensitivity was given in this letter.Experiments were carried out to test the frequency response of the hydrophone.The result shows that when the Young's modulus of the diaphragm is higher,a flatter frequency response will be obtained.     

Study On Laser Fiber Diameter Measurement Instrument

ＳｔｕｄｙＯｎＬａｓｅｒＦｉｂｅｒＤｉａｍｅｔｅｒＭｅａｓｕｒｅｍｅｎｔＩｎｓｔｒｕｍｅｎｔ￥ＺＨＯＵＧｅ；ＬＩＵＺｅｙｉ；ＬＩＨｅｑｉａｏ；ＭＡＯＹｉ；ＺＨＡＮＧＹｉｍｏ（ＩｎｓｔｉｔｕｔｅｏｆＯｐｔｏｅｌｅｃｔｒｏｎｉｃ＆ＰｒｅｃｉｓｉｏｎＥｎｇ...     

Fiber-optical Confocal Scanning MicroscopeUsing Single-mode Fiber Coupler

SupportedinpartbyWangKuanChenEductionFoundationofAcademiaSinicaandExchangePlanofAcademiaSinicaandAustralianResearchCouncil,andpartsupportedbyNationalNaturalScienceFoundationofChina.1.IntroductionInthefamilyoftheconfocalscanningmicrosc0pe(CSM),thereappearsanewmemberrecently,thatisfibcr-0pticalCSM[1'2j.Inthispaperweusesingle-m0defiberdirectionalcou-pler(3dB)andgradicnt-index-r0dlenscs(GRlN)t0constructapure0ptical-fiberconfocalscanningmicroscope.Inthatfo1lo\vsx`ediscusstheimageformati…     

Characteristics of Multiply π Phase-shifted Long-period Fiber Gratings

The transmission spectra of multiply π phase-shifted long-period fiber gratings (LPFG's) are analyzed by a combination of coupled-mode theory and the fundamental matrix method. The theoretical simulation shows that the LPFG' s can act as novel bandpass filters with two dominant passbands when multiple π phase-shifts are introduced at particular locations along the grating.     

Novel Scheme for Narrow Band Fiber Filter System

ＮｏｖｅｌＳｃｈｅｍｅｆｏｒＮａｒｒｏｗＢａｎｄＦｉｂｅｒＦｉｌｔｅｒＳｙｓｔｅｍＺＨＡＯＹｕｃｈｅｎｇ；ＪＩＡＮＳｈｕｉｓｈｅｎｇ；ＷＡＮＧＷｅｉ；ＴＩＡＮＷｅｎｑｉａｎｇ（ＮｏｒｔｈｅｒｎＪｉａｏｔｏｎｇＵｎｖｉｖｅｒｓｉｔｙ，Ｉｎｓｔｉｔｕｔｅ...     

Experimental Study on Optic Fiber Sensing System for Simultaneous Measurement of Curent and Voltage Using One Lo-Bi Fiber

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｈｅｌａｓｔｆｅｗｙｅａｒｓ，ｃｕｒｅｎｔａｎｄｖｏｌｔａｇｅｍｅａｓｕｒｅｍｅｎｔｓｙｓｔｅｍｓｂａｓｅｄｏｎｏｐｔｉｃａｌｄｅｖｉｃｅｓｈａｖｅｂｅｅｎｄｅｖｅｌｏｐｅｄ．Ａｎｕｍｂｅｒｏｆｑｕｉｔｅｄｉｆｅｒｅｎ...     

Narrow Linewidth Tm^3＋-Doped Large Core Fiber Laser Based on a Femtosecond Written Fiber Bragg Grating

A diode laser （LD） clad-pumped narrow linewidth all-fiber Tm^3＋-doped fiber laser is reported with a maximal output power of 27W at 1.947μm. By successively splicing an LD pigtail fiber, a single-mode Tm^3＋-doped fiber, and a multi-mode Tm^3＋-doped fiber, the fiber laser has 70pm narrow linewidth output, and a high slope efficiency of nearly 47.5% with respect to the launched pump power. The high reflectivity fiber Bragg gratings, which are directly written into the single-mode Tm^3＋-doped fiber core by the 800nm femtosecond pulsed laser, act as the high reflectivity coupler. The output laser has diffraction-limited beam quality with a factor M^2 of 1.29, when the output laser power is nearly 27W.     

Fiber Bragg grating pressure sensor with enhanced sensitivity

A novel fiber Bragg grating(FBG)pressure sensor with the enhanced sensitivity has been demonstrated.A piston-like diaphragm with a hard core in the center is used to enhance the sensitivity.Both the theoretical analysis and the experimental result show that the radius of the hard core has significant effect on the pressure sensitivity.When the radius of the hard core is 1.5 ram,a pressure sensitivity of 7.23 nm/MPa has been achieved.     

A Novel Fiber Taper for Efficient Optical Interconnection

１ＩｎｔｒｏｄｕｃｔｉｏｎＩｎｔｅｒｃｏｎｎｅｃｔｉｏｎｓｏｆｏｐｔｉｃａｌｗａｖｅｇｕｉｄｅｃｏｍｐｏｎｅｎｔｓｗｉｔｈｄｉｆｅｒｅｎｔｍｏｄａｌｓｐｏｔｓｉｚｅｓ，ｐａｒｔｉｃｕｌａｒｌｙｆｏｒｔｈｅｃｏｎｎｅｃｔｉｏｎｏｆ（１）ｌａｓｅｒｓｏｕ...     

Design of Broadband L-band Erbium Doped Fiber Amplifier

1　Ｉｎｔｒｏｄｕｃｔｉｏｎ　　Ｗａｖｅｌｅｎｇｔｈ ｄｉｖｉｓｉｏｎｍｕｌｔｉｐｌｅｘｉｎｇ(ＷＤＭ )ｍｅｔｈｏｄｇｉｖｅｓａｓｏｌｕｔｉｏｎｏｆｄｅｍａｎｄｏｎｔｈｅｈｉｇｈｓｐｅｅｄａｎｄｈｉｇｈｃａｐａｃｉｔｙｔｒａｎｓｍｉｓｓｉｏｎ .ＯｎｅｏｆｔｈｅｋｅｙｔｅｃｈｎｏｌｏｇｙｏｆｔｈｅＷＤＭｔｒａｎｓｍｉｓｓｉｏｎｉｓｔｏｂｒｏａｄｅｎｂａｎｄｗｉｄｔｈｏｆｅｒｂｉｕｍ ｄｏｐｅｄｆｉｂｅｒａｍｐｌｉｆｉｅｒ (ＥＤＦＡ)ａｎｄｔｏｇｅｔｔｈｅｗｉｄｅｂａｎｄａｎｄｆｌａｔ ｇａｉｎＥＤＦＡ .…     

Fabrication of High Reflection UVWritten Fiber Bragg Gratings

l.IntroductionFibergratingshaveattractedanincreasingamountofattentionsineeG.Meltz[1Jandhisco-workersfirstdemonstratedinl989thatPermanentgratingscouldbewrittenbyex-peinganoPticalfiberfromthesidetotwointerferingbeamsofultraviolet(UV)light.Inrecentyears,avastresearchefforthasbeendevotedtoopticalfiberBragggratingsallovertheworld.Theirsimplicity,usefu1nesscoupledtotheiruniqueproPertiesandnu-merousadvantagesmakethemidealforawiderangeofimPOrtantapplicationsinopticalfibertelecommunications,lasersa…