1、 TIA-526-10-1991 APPROVED: JUNE 1, 1991 REAFFIRMED: DECEMBER 1, 2008 REAFFIRMED: OCTOBER 6, 2014 TIA-526-10 June 1991OFSTP-10 Measurement of Dispersion Power Penalty in Digital Single-Mode Systems NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through eli
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20、TIONS. OFSTP-10 MEASUREMENT OF DISPERSION POWER PENALTY IN DIGITAL SINGLE-MODE SYSTEMS CONTENTS Section 1. 2. 3. 4. 5. 6. 7. 8. APPENDIX Figure 1. 2. 3. 4. INTRODUCTION APPLICABLE DOCUMENTS APPARATUS SAMPLING AND SPECUIENS PROCEDURE CALCULATIONS OR INTEWRETATION OF RESULTS DOCUMENTATION SPECIFICATIO
21、N INFORMATION COMPARISON BETWEEN OFSTP-10 AND IEC, ISO, AND CCZIT REQUIREMENTS 1 1 2 3 3 5 6 6 12 Bx RECEIVER SENSITIVITY MEASUREMENT CONFIGURATION 8 DAISY-CHAIN TEST CONFIGURATION 9 POWER PENALTY MEASUREMENT CONFIGURATION 10 11 SAMPLE PLOT OF BER vs P, COPYRIGHT Electronic Industries AllianceLicens
22、ed by Information Handling ServicesSTD-EIA TIA-52b-lO-ENGL 1773 3234b00 ObLLi4L7 LO5 TIA/EIA-5?6- 10 Page 1 OFSTP-10 MEASUREMENT OF DISPERSION POWER PENALTY IN DIGITAL SINGLE-MODE SYSTEMS (From Standards Proposal No. 2373-,4, formulated under the cognizance of the FO-2.1 Subcommittee on Optical Fibe
23、r Telecommunications Systems.) This OFSTP is a part of the series of test procedures included within Recommended Standard TIAEIA- 526. 1. INTRODUCTION This document provides test procedures to measure the dispersion power penalty in a single-mode optical fiber communications system. The power penalt
24、y is measured using the maximum dispersion (ps/nm) the system is designed to accommodate as specified by the manufacturer. The power penalty is measured at the manufacturer-specified Bit-Error Ratio (BER) performance level (typically lo-(). NOTE: To achieve large amounts of dispersion with relativel
25、y short lengths of fiber, the measurement technique described in this document may involve the use of a fiber having a zero-dispersion wavelength at some wavelength region (e.g., 1310 nm, 1550 nm) that differs from the central wavelength of the system transmitter. For systems operating above about 1
26、 Gb/s, this method may not provide an accurate measurement of the dispersion power penalty resulting from a long length of fiber which has zero- dispersion in the same region as the system wavelength. 2. APPLICABLE DOCUMENTS The following documents form a part of this OFSTP to the extent specified h
27、erein: FOP- 127 (EIAfIA-455- 127) Spectral Characterization of Multimode Luser Diodes OFSTP-5 (EIAAiA-526-5) Data Analysis of Bit Error Ratio versus Received Power for Digital Fiber Optic Systems EIA/TIA-559 Single-Mode Fiber Optic Transmission Design To be published at a future date. COPYRIGHT Elec
28、tronic Industries AllianceLicensed by Information Handling Services“IA/EIA-526-10 Page 2 3. APPARATUS The following apparatus is necessary to carry out this test procedure. 3.1 BER Test Set The test set (e.g., a DS3 Transmitter and DS3 Receiver) shall be capable of providing a pseudo-random data inp
29、ut to the system, consistent (in pulse shape, ampiitudqetc.) with the signal format required at the system input interface. The receiver portion of the test set shall be able to interface with the system output for computing the BER performance. 32 Optical Power Meter (OPM) The OPM shall have a disp
30、lay resolution of at least 0.1 dB. The OPM shall be calibrated for use with single-mode fiber at the wavelength and power range of operation. The calibration shall be traceable to National Institute of Standards and Technology (NIST). 33 Variable Optical Attenuator The attenuator shall be capable of
31、 attenuating in steps less than or equal to 0.25 di3 and should be able to provide total attenuation 5 to 10 dB more than the system gain. The attenuator used should be designed to avoid significant back-reflection into the transmitter. 3.4 Optical Splitter The optical splitter (coupler) shall have
32、one input port and two output ports, each of which is equipped with an appropriate connector. The splitting ratio for the output ports shall be approximately 50%. The optical splitter used should be designed to avoid significant back-reflection into the transmitter. Caution should also be taken to a
33、void leaving an output port unterminated, as a significant reflection from the glass/air interface could occur. 35 Jumper Cables Use appropriate jumper cables to interconnect the test set and the system under test. 3.6 Single-Mode Fiber Use either Class Na (dispersion-unshifted) or Class IVb (disper
34、sion-shifted) single-mode fiber for which the spectral characteristics are known over the operating wavelength range of the sources used in the fiber optic terminal equipment. Refer to the appropriate procedures/addenda of EL4455 (FOP-series) for methods to characterize the fiber. NOTE: Ali of the o
35、ptical components (e.g., connectors, splitters, attenuators, etc.) used in this procedure shall have reflectances less than -30 dB. COPYRIGHT Electronic Industries AllianceLicensed by Information Handling ServicesTIAJZIA-5 26- 1 O Page 3 4. SAMPLING AND SPECIMENS The test sample shall be a fiber opt
36、ic transmission system including all signal conditioning and multiplexing equipment used in the system under normal operating conditions. The system inputs and outputs shall be those normally seen by the user of the system. Refer to the System Detail specification to obtain the maximum transceiver d
37、ispersion (ps/nm) of the system. 5. PROCEDURE Follow the procedures of 5.1 through 5.10 to measure the received power (PR) levels required to achieve different BER performance levels. 5.12 through 5.14 repeat the procedures of 5.1 through 5.10, but also include the use of a long length of fiber in c
38、onjunction with the optical attenuator in the optical loop-back path (refer to Figure 3). 5.1 Unless otherwise specified, the system shall be tested under standard operating conditions as defined in EImA-559. The ambient or reference point temperature and humidity shall be specified. 5.2 Apply the a
39、ppropriate supply voltage to the system under test. Follow appropriate standard (or extended) operating conditions defined in EIA/I1A-559. Allow sufficient time (30 minutes unless otherwise specified by the manufacturer) for the teminal under test to reach a steady-state temperature and performance
40、condition. 5.3 Turn the OPM on and allow the recommended warm-up and settling time to achieve the rated measurement performance. 5.4 As part of standard operating conditions, fully load all of the terminai inputs with a pseudo-random signal from the BER test set transmitter. Use the maximum possible
41、 pseudo-random word length, but at least 215 - 1 bits. Select a channel to be monitored and connect the terminal output of the selected channel to the BER test set receiver. Refer to Figure 1. If the system has a number of inputs of the same type (e.g., 12 DS3 inputs or 84 DS1 inputs), these inputs
42、can be daisy-chained as shown in Figure 2. In effect, error performance is monitored at nearly the optical line rate. The daisy-chained arrangement significantly reduces the required measurement time. Refer to 6.1. 5.5 As shown in Figures 1 and 2, apply the optical output of the transmitter to the r
43、eceiver input through the optical attenuator and optical splitter. 5.6 Use the following procedures to determine the calibration factor to be applied to the OPM reading so as to determine the received power (PR) at the input of the optical receiver: 5.6.1 Connect a fiber optic jumper cable between p
44、ort #1 of the optical splitter and the OPM. Adjust the attenuator such that the OPM reads the manufacturer-specified minimum received power (Phin) COPYRIGHT Electronic Industries AllianceLicensed by Information Handling ServicesTIA/EIA-526-10 Page 4 necessary to achieve the specified BER. Disconnect
45、 the connector from the OPM and connect it to the receiver optical input connector. 5.6.2 Connect another fiber optic jumper cable from port #2 of the optical splitter to the OPM. Adjust or calculate the calibration factor for the OPM so that the OPM indicates the manufacturer-specified minimum rece
46、ived power (PRmin) necessary to achieve the specified BER. 5.7 Adjust the optical attenuator so that a BER in the range of monitoring time from 6.2. Record the received power (PR) and BER measurement. 5.8 Repeat 5.7 to obtain a minimum of three is obtained. Determine the error BER vs. PR data points
47、 covering the BER range from 104 to 104. 5.9 Use the analysis procedures described in OFSTP-5 to analyze the BER vs. PR data and determine the receiver sensitivity PR) at the manufacturer-guaranteed terminal BER performance. 5-10 Adjust the optical attenuator to set the received power (PR) at the ma
48、nufacturer specified minimum received power level (Pb,). At this input power level, the specified BER performance should be achieved. Monitor the error performance for the smaller of either 24 hours or the error monitoring time given by 6.2. Record the calculated BER value. 5.11 Measure the central
49、wavelength of the transmiter following the requirements of FOP-127. 5.12 Using 6.3, calculate the length of fiber (0 to be inserted in the system to obtain the manufacturer- specified maximum tolerable dispersion. First attempt to use fiber matched to the central wavelength (4) of the system transmitter (dispersion-unshifted fiber with a 1310nm transmitter or dispersion-shifted fiber with a 1.550 nm transmitter). If the loss of this fiber length exceeds the system gain, then it is necessary to use fiber which is not close to that of the system transmitter, use dispersion-shifted
