TIA-455-192-1999 FOTP-192 H-Parameter Test Method for Polarization-Maintaining Optical Fiber《FOTP-192 偏振保持光纤的H参数测量方法》.pdf

1、 TIASTANDARDFOTP-192H-Parameter Test Method forPolarization-MaintainingOptical FiberTIA-455-192May 1999TELECOMMUNICATIONS INDUSTRY ASSOCIATIRepresenting the telecommunications industry inassociation with the Electronic Industries Alliance ANSI/TIA/EIA-455-192-1999Approved: May 13, 1999Reaffirmed: Ma

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21、duction or networking permitted without license from IHS-,-,-TIA-455-192iTIA/EIA-455-192h-parameter test method for polarization-maintaining optical fiberContents1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Normative

22、references . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Apparatus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34 Sampling and specimens. . . . . . . . . . . . . . . . . . . . . . .

23、 . . . . . . . . . . . . . . . . . . . . . . 55 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67 Do

24、cumentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78 Specification information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7Annex A Source coherence length criterion . . . . . . . . . . .

25、 . . . . . . . . . . . . . . . . . . . . . .8Annex B Comparison between this standard and IEC or ITU Standards. . . . . . . . . . . .8Figure 1 h-parameter measurement system schematic . . . . . . . . . . . . . . . . . . . . . . . 5Copyright Telecommunications Industry Association Provided by IHS und

26、er license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-455-192iiThis page left blankCopyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IH

27、S-,-,-TIA-455-192iii_Foreword_This Standard comes from TIA Project No. 3781 and was formulated under thecognizance of TIA joint working group FO-6.6.3/6.9.3. This FOTP is part of a series of test procedures included within RecommendedStandard EIA/TIA-455.This Standard describes a new test method. Th

28、ere two annexes to this Standard: oneis normative and the other informative.Key words: h-parameter, polarization crosstalk, polarization-maintaining optical fiber.Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permi

29、tted without license from IHS-,-,-TIA-455-192ivThis page left blank.Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TIA-455-1921FOTP-192h-parameter test method for polarization-

30、maintaining optical fiber_1 Introduction_1.1 IntentThis Standard specifies a method of measuring the h-parameter of single mode, highlylinearly birefringent optical fiber (commonly called polarization-maintaining fibers).In the case of fibers having connectors attached to one or both ends, or for tw

31、o or moresuch fibers joined in series, the polarization crosstalk is a more meaningful measure ofperformance than the h-parameter. The test method for measuring polarizationcrosstalk is the subject of FOTP-193. In theory, if perfectly linearly polarized light is launched into a high birefringence fi

32、berwith its plane of polarization exactly aligned to either of the fibers principal axes, thenthe light radiated at the distal end will also be perfectly polarized. In practice, some lightgradually couples to the not-launched polarization, and at the distal end of the fiber asmall, unintended, compo

33、nent is present. This Standard describes a test method formeasuring this imperfection.The coupling between polarization states is due to both fiber characteristics andenvironmental influences. To differentiate these effects and allow for comparativeevaluations of fibers, this procedure suggests stan

34、dard configurations for the testspecimen (See section 4).1.2 DefinitionsFor the purposes of this Standard, the following definitions apply.h-parameter. A length normalized form of polarization crosstalk. h has units of inversemeters and is given by the equationh = tanh-1(Pmin/Pmax) / L (1)where L is

35、 the fiber length; Pmaxand Pminare the portion of the emitted power withpolarization plane parallel and orthogonal, respectively, to the excited axis.Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without

36、license from IHS-,-,-TIA-455-1922The plane of polarization of the light launched into the fiber is parallel to either principaloptical axis, The function tanh-1() is the inverse hyperbolic tangent. For Pmin/Pmaxlessthan 0.1, a sufficient approximation to the above equation ish = (Pmin/Pmax) / L. (2)

37、Birefringent material. A material in which orthogonal polarizations propagate atdifferent speeds. A linearly birefringent material is one in which the orthogonalpolarizations are linear. Materials may also be circularly or elliptically birefringent.Principal optical axes. The axes for which the spee

38、d of light in a linearly birefringentmaterial is a maximum or a minimum.Polarizer/analyzer. Optical elements designed to transmit light of a single polarizationstate - most commonly, a linear state. When a polarizer is placed at the output of anoptical system, it is called an analyzer.Extinction. Th

39、e ratio of the optical power passed in the transmitted polarization state tothe power passed in the orthogonal polarization state. The extinction of a polarizingelement can be measured with unpolarized light incident.Polarization crosstalk. The ratio of the power that crosses over to the initiallyun

40、excited polarization state to the power that remains in the initially excited state (bothpowers measured at the elements distal end). The polarization crosstalk of abirefringent element is measured with polarized light incident, aligned in succession toeach of the elements principal axes.Coherence l

41、ength. The coherence length, lc, of an optical light source shall be definedby the following relation:lc = 2/ (3)where is the center wavelength of the light source; is the line-width of the light source at the -3 dB intensity level.Beat length. The length of fiber needed to create a 2 phase differen

42、ce betweenorthogonal polarization states. It can be expressed by the following relation:LB = /B (4)where is the center wavelength of the source;Copyright Telecommunications Industry Association Provided by IHS under license with EIANot for ResaleNo reproduction or networking permitted without licens

43、e from IHS-,-,-TIA-455-1923B is the birefringence of the fiber given as (ne no)neis the extraordinary refractive index of the specimennois the ordinary refractive index of the specimen_2 Normative references_The following standards contain provisions that, through reference in this text, constitutep

44、rovisions of this Standard. At the time of publication, the editions indicated were valid.All standards are subject to revision, and parties to agreements based on this Standardare encouraged to investigate the possibility of applying the most recent editions of thestandards indicated below. ANSI an

45、d TIA maintain registers of currently valid nationalstandards published by them.ANSI/TIA/EIA 440-A Fiber Optic TerminologyANSI/TIA/EIA 455-A Standard Test Procedure for Fiber Optic Fibers, Cables,Transducers, Sensors, Connecting and TerminatingDevices, and Other Fiber Optic ComponentsANSI/TIA/EIA 49

46、20000-A Generic Specification for Optical Waveguide FibersANSI/TIA/EIA 455-80B Cut-off Wavelength Measurement ProcedureANSI/TIA/EIA 455-57 Optical Fiber End Preparation and ExaminationANSI/TIA/EIA 455-193 Polarization Crosstalk Test Method for Polarization-Maintaining Optical Fiber_3 Apparatus_3.1 L

47、ight sourceThe amount of light the source emits must be either stable over the duration of the testor normalized by means of a reference. Without a reference, the source powerfollowing the polarizer must not vary by more than 5% during the measurement.The source power must be kept below the level required to induce nonli