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Fiber Optic Transmitter and Receiver Data Links for 155 MBd Technical Data
HFBR-1116T Transmitter HFBR-2116T Receiver
Features
* Full Compliance with the Optical Performance Requirements of the ATM Forum UNI SONET OC-3 Multimode Physical Layer Specification * Other Versions Available for: - FDDI - Fibre Channel * Compact 16-pin DIP Package with Plastic ST* Connector * Wave Solder and Aqueous Wash Process Compatible Package * Manufactured in an ISO 9001 Certified Facility
Description
The HFBR-1116/-2116 series of data links are high-performance, cost-efficient, transmitter and receiver modules for serial optical data communication applications specified at 155 MBd for ATM UNI applications. These modules are designed for 50 or 62.5 m core multimode optical fiber and operate at a nominal wavelength of 1300 nm. They incorporate our highperformance, reliable, longwavelength, optical devices and proven circuit technology to give long life and consistent performance.
Applications
* ATM Switches, Hubs, and Network Interface Cards * Multimode Fiber ATM Wiring Closet-to-Desktop Links * Point-to-Point Data Communications * Replaces DLT/R1040-ST1 Model Transmitters and Receivers
Transmitter
The transmitter utilizes a 1300 nm surface-emitting InGaAsP LED, packaged in an optical subassembly. The LED is dc-coupled to a custom IC which converts differential-input, PECL logic signals, ECL-referenced (shifted) to a +5 V power supply, into an analog LED drive current.
preamplifier IC. The PINpreamplifier combination is accoupled to a custom quantizer IC which provides the final pulse shaping for the logic output and the Signal Detect function. Both the Data and Signal Detect Outputs are differential. Also, both Data and Signal Detect Outputs are PECL compatible, ECL-referenced (shifted) to a +5 V power supply.
Package
The overall package concept for the Data Links consists of the following basic elements: two optical subassemblies, two electrical subassemblies, and the outer housings as illustrated in Figure 1.
Receiver
The receiver utilizes an InGaAs PIN photodiode coupled to a custom silicon transimpedance
*ST is a registered trademark of AT&T Lightguide Cable Connectors.
5965-3482E (8/96)
189
RECEIVER DIFFERENTIAL DATA IN DIFFERENTIAL SIGNAL DETECT OUT ELECTRICAL SUBASSEMBLIES TRANSMITTER DIFFERENTIAL DATA IN VBB QUANTIZER IC PREAMP IC
PIN PHOTODIODE
OPTICAL SUBASSEMBLIES
SIMPLEX ST(R) RECEPTACLE
The package outline drawing and pinout are shown in Figures 2 and 3. The details of this package outline and pinout are compatible with other data-link modules from other vendors. The optical subassemblies consist of a transmitter subassembly in which the LED resides and a receiver subassembly housing the PIN-preamplifier combination. The electrical subassemblies consist of a multi-layer printed circuit board on which the IC chips and various surface-mounted, passive circuit elements are attached.
DRIVER IC LED
TOP VIEW
Figure 1. Transmitter and Receiver Block Diagram.
THREADS 3/8 - 32 UNEF-2A HFBR-111X/211XT DATE CODE (YYWW) SINGAPORE
8.31
12.19 MAX.
41 MAX.
5.05
7.01 5.0
0.9
9.8 MAX.
3
2.45 19.72
NOTES: 1. MATERIAL ALLOY 194 1/2H - 0.38 THK FINISH MATTE TIN PLATE 7.6 m MIN. 2. MATERIAL PHOSPHOR BRONZE WITH 120 MICROINCHES TIN LEAD (90/10) OVER 50 MICROINCHES NICKEL. 3. UNITS = mm
12
17.78 (7 x 2.54)
8 x 7.62
HOUSING PINS 0.38 x 0.5 mm NOTE 1 PCB PINS DIA. 0.46 mm NOTE 2
Figure 2. Package Outline Drawing.
190
12
OPTICAL POWER BUDGET (dB)
OPTICAL PORT
OPTICAL PORT
10 8
62.5/125 m
50/125 m 6 4 2 0 0
NC GND VCC VCC GND DATA DATA NC
9 10 11 12 13 14 15 16
8 7 6 5 4 3 2 1
NC NO PIN GND GND GND GND VBB NC
NC NO PIN GND GND GND SD SD NO PIN
9 10 11 12 13 14 15 16
8 7 6 5 4 3 2 1
NC GND VCC VCC VCC DATA DATA NC
0.3 0.5
1.0
1.5
2.0
2.5
FIBER OPTIC CABLE LENGTH (km)
Figure 4. Optical Power Budget at BOL vs. Fiber Optic Cable Length.
TRANSMITTER
RECEIVER
Figure 3. Pinout Drawing.
Each transmitter and receiver package includes an internal shield for the electrical subassembly to ensure low EMI emissions and high immunity to external EMI fields. The outer housing, including the ST* port, is molded of filled, nonconductive plastic to provide mechanical strength and electrical isolation. For other port styles, please contact your HewlettPackard Sales Representative. Each data-link module is attached to a printed circuit board via the 16-pin DIP interface. Pins 8 and 9 provide mechanical strength for these plastic-port devices and will provide port-ground for forthcoming metal-port modules.
The following information is provided to answer some of the most common questions about the use of these parts.
Transmitter and Receiver Optical Power Budget versus Link Length
The Optical Power Budget (OPB) is the available optical power for a fiber-optic link to accommodate fiber cable losses plus losses due to in-line connectors, splices, optical switches, and to provide margin for link aging and unplanned losses due to cable plant reconfiguration or repair. Figure 4 illustrates the predicted OPB associated with the transmitter and receiver specified in this data sheet at the Beginning of Life (BOL). This curve represents the attenuation and chromatic plus modal dispersion losses associated with 62.5/125 m and 50/125 m fiber cables only. The area under the curve represents the remaining OPB at any link length, which is available for overcoming non-fiber cable related losses.
Application Information
The Applications Engineering group of the Optical Communication Division is available to assist you with the technical understanding and design tradeoffs associated with these transmitter and receiver modules. You can contact them through your Hewlett-Packard sales representative.
*ST is a registered trademark of AT&T Lightguide Cable Connectors.
191
Transmitter and Receiver Signaling Rate Range and BER Performance
For purposes of definition, the symbol rate (Baud), also called signaling rate, is the reciprocal of the symbol time. Data rate (bits/ sec) is the symbol rate divided by the encoding factor used to encode the data (symbols/bit). When used in 115 Mbps SONET OC-3 applications, the performance of Hewlett-Packard's 1300 nm data link modules, HFBR1116/-2116, is guaranteed to the full conditions listed in the individual product specification tables. The data link modules may be used for other applications at signaling rates different than the 155 Mbps with some variation in the link optical power budget. Figure 5 gives an indication of the typical performance of these 1300 nm products at different rates.
TRANSMITTER/RECEIVER RELATIVE OPTICAL POWER BUDGET AT CONSTANT BER (dB)
BIT ERROR RATIO
These data link modules can also be used for applications which require different bit-error-ratio (BER) performance. Figure 6 illustrates the typical trade-off between link BER and the receiver input optical power level.
1 x 10-2
1 x 10-3 1 x 10-4 1 x 10-5 1 x 10-6 1 x 10-7 1 x 10-8 1 x 10-9 1 x 10-10 1 x 10-11 1 x 10-12 -6 -4 -2 0 2 4 RELATIVE INPUT OPTICAL POWER - dB CONDITIONS: 1. 155 MBd 2. PRBS 27-1 3. TA = 25 C 4. VCC = 5 Vdc 5. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns. CENTER OF SYMBOL
The jitter specifications stated in the following transmitter and receiver specification table are derived from the values in Table B1 of Annex B. They represent the worst-case jitter contribution that the transmitter and receiver are allowed to make to the overall system jitter without violating the Annex B allocation example. In practice, the typical jitter contribution of the HewlettPackard data link modules is well below the maximum allowed amounts.
Recommended Handling Precautions
It is advised that normal static precautions be taken in the handling and assembly of these data link modules to prevent damage which may be induced by electrostatic discharge (ESD). The HFBR-1116/2116 series meets MIL-STD-883C Method 3015.4 Class 2. Care should be taken to avoid shorting the receiver Data or Signal Detect Outputs directly to ground without proper currentlimiting impedance.
Figure 6. Bit Error Ratio vs. Relative Receiver Input Optical Power.
2.5 2.0 1.5 1.0 0.5 0 0.5
Data Link Jitter Performance
The Hewlett-Packard 1300 nm data link modules are designed to operate per the system jitter allocations stated in Table B1 of Annex B of the ANSI T1E1.2 Revision 3 standard.
0 25 50 75 100 125 150 175 200
Solder and Wash Process Compatibility
The transmitter and receiver are delivered with protective process caps covering the individual ST* ports. These process caps protect the optical subassemblies during wave solder and aqueous wash processing and act as dust covers during shipping. These data link modules are compatible with either industry standard wave- or hand-solder processes.
SIGNAL RATE (MBd)
CONDITIONS: 1. PRBS 27-1 2. DATA SAMPLED AT CENTER OF DATA SYMBOL. 3. BER = 10-6 4. TA = 25 C 5. VCC = 5 Vdc 6. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns.
The 1300 nm transmitter will tolerate the worst-case input electrical jitter allowed in Annex B without violating the worst-case output jitter requirements. The 1300 nm receiver will tolerate the worst-case input optical jitter allowed in Annex B without violating the worst-case output electrical jitter allowed.
Figure 5. Transmitter/Receiver Relative Optical Power Budget at Constant BER vs. Signaling Rate.
192
Shipping Container
The data link modules are packaged in a shipping container designed to protect it from mechanical and ESD damage during shipment or storage.
Board Layout-Interface Circuit and Layout Guidelines
It is important to take care in the layout of your circuit board to achieve optimum performance from these data link modules. Figure 7 provides a good example of a power supply filter circuit that works well with these parts. Also,
suggested signal terminations for the Data, Data-bar, Signal Detect and Signal Detect-bar lines are shown. Use of a multilayer, ground-plane printed circuit board will provide good high-frequency circuit performance with a low inductance ground return path. See additional recommendations noted in the interface schematic shown in Figure 7.
Tx
Rx
* A L2 1 +5 Vdc GND DATA DATA R3 82 R2 82 R4 130 R1 130 C2 0.1
9 NC 10 GND 11 VCC 12 VCC 13 GND 14 D 15 D 16 NC
NC 8 NO 7 PIN GND 6 GND 5 GND 4 GND 3 VBB 2 NC 1
*
*
9 NC 10 NO PIN 11 GND 12 GND 13 GND 14 SD 15 SD NO 16 PIN
NC 8 GND 7 VCC 6 VCC 5 VCC 4 D3 D2 NC 1
* L1 1 C1 0.1 C7 10 (OPTIONAL) C3 0.1 C4 10 A
DATA DATA R7 82 R9 82 R11 82 SD R5 82 R8 130 R6 130
C6 0.1
C5 0.1
TERMINATE D, D AT Tx INPUTS
TOP VIEWS
SD R10 130 R12 130
TERMINATE D, D, SD, SD AT INPUTS OF FOLLOW-ON DEVICES
NOTES: 1. RESISTANCE IS IN OHMS. CAPACITANCE IS IN MICROFARADS. INDUCTANCE IS IN MICROHENRIES. 2. TERMINATE TRANSMITTER INPUT DATA AND DATA-BAR AT THE TRANSMITTER INPUT PINS. TERMINATE THE RECEIVER OUTPUT DATA, DATA-BAR, AND SIGNAL DETECTBAR AT THE FOLLOW-ON DEVICE INPUT PINS. FOR LOWER POWER DISSIPATION IN THE SIGNAL DETECT TERMINATION CIRCUITRY WITH SMALL COMPROMISE TO THE SIGNAL QUALITY, EACH SIGNAL DETECT OUTPUT CAN BE LOADED WITH 510 OHMS TO GROUND INSTEAD OF THE TWO RESISTOR, SPLIT-LOAD PECL TERMINATION SHOWN IN THIS SCHEMATIC. 3. MAKE DIFFERENTIAL SIGNAL PATHS SHORT AND OF SAME LENGTH WITH EQUAL TERMINATION IMPEDANCE. 4. SIGNAL TRACES SHOULD BE 50 OHMS MICROSTRIP OR STRIPLINE TRANSMISSION LINES. USE MULTILAYER, GROUND-PLANE PRINTED CIRCUIT BOARD FOR BEST HIGHFREQUENCY PERFORMANCE. 5. USE HIGH-FREQUENCY, MONOLITHIC CERAMIC BYPASS CAPACITORS AND LOW SERIES DC RESISTANCE INDUCTORS. RECOMMEND USE OF SURFACE-MOUNT COIL INDUCTORS AND CAPACITORS. IN LOW NOISE POWER SUPPLY SYSTEMS, FERRITE BEAD INDUCTORS CAN BE SUBSTITUTED FOR COIL INDUCTORS. LOCATE POWER SUPPLY FILTER COMPONENTS CLOSE TO THEIR RESPECTIVE POWER SUPPLY PINS. C7 IS AN OPTIONAL BYPASS CAPACITOR FOR IMPROVED, LOW-FREQUENCY NOISE POWER SUPPLY FILTER PERFORMANCE. 6. DEVICE GROUND PINS SHOULD BE DIRECTLY AND INDIVIDUALLY CONNECTED TO GROUND. 7. CAUTION: DO NOT DIRECTLY CONNECT THE FIBER-OPTIC MODULE PECL OUTPUTS (DATA, DATA-BAR, SIGNAL DETECT, SIGNAL DETECT-BAR, VBB) TO GROUND WITHOUT PROPER CURRENT LIMITING IMPEDANCE. 8. (*) OPTIONAL METAL ST OPTICAL PORT TRANSMITTER AND RECEIVER MODULES WILL HAVE PINS 8 AND 9 ELECTRICALLY CONNECTED TO THE METAL PORT ONLY AND NOT CONNECTED TO THE INTERNAL SIGNAL GROUND.
Figure 7. Recommended Interface Circuitry and Power Supply Filter Circuits.
193
Board Layout-Hole Pattern
The Hewlett-Packard transmitter and receiver hole pattern is compatible with other data link modules from other vendors. The drawing shown in Figure 8 can be used as a guide in the mechanical layout of your circuit board.
(16X) o 0.8 0.1 .032 .004 O 0.000 M A
-A-
17.78 .700
(7X) 2.54 .100
7.62 .300 TOP VIEW UNITS = mm/INCH
Figure 8. Recommended Board Layout Hole Pattern.
194
These data link modules are intended to enable commercial system designers to develop equipment that complies with the various international regulations governing certification of Information Technology Equipment. Additional information is available from your Hewlett-Packard sales representative. All HFBR-1116T LED transmitters are classified as IEC-825-1 Accessible Emission Limit (AEL) Class 1 based upon the current proposed draft scheduled to go into effect on January 1, 1997. AEL Class 1 LED devices are considered eye safe. See Application Note 1094, LED Device Classifications with Respect to AEL Values as Defined in the IEC 825-1 Standard and the European EN60825-1 Directive. The material used for the housing in the HFBR-1116/-2116 series is Ultem 2100 (GE). Ultem 2100 is recognized for a UL flammability rating of 94V-0 (UL File Number E121562) and the CSA (Canadian Standards Association) equivalent (File Number LS88480).
- TRANSMITTER OUTPUT OPTICAL SPECTRAL WIDTH (FWHM) -nm
Regulatory Compliance
200 3.0 1.0 160 1.5 2.0 2.5 3.0 100 1260 1280 tr/f - TRANSMITTER OUTPUT OPTICAL RISE/FALL TIMES - ns 1300 1320 1340 1360
180
140
120
C - TRANSMITTER OUTPUT OPTICAL CENTER WAVELENGTH -nm HFBR-1116T TRANSMITTER TEST RESULTS OF C, AND tr/f ARE CORRELATED AND COMPLY WITH THE ALLOWED SPECTRAL WIDTH AS A FUNCTION OF CENTER WAVELENGTH FOR VARIOUS RISE AND FALL TIMES.
Figure 9. HFBR-1116T Transmitter Output Optical Spectral Width (FWHM) vs. Transmitter Output Optical Center Wavelength and Rise/ Fall Times.
RELATIVE INPUT OPTICAL POWER (dB)
5
4 3 2
1
0 -3
-2
-1
0
1
2
3
EYE SAMPLING TIME POSITION (ns) CONDITIONS: 1.TA = 25 C 2. VCC = 5 Vdc 3. INPUT OPTICAL RISE/FALL TIMES = 1.0/2.1 ns. 4. INPUT OPTICAL POWER IS NORMALIZED TO CENTER OF DATA SYMBOL. 5. NOTE 15 AND 16 APPLY.
Figure 10. HFBR-2116T Receiver Input Optical Power vs. Eye Sampling Time Position.
195
HFBR-1116T Transmitter Pin-Out Table
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol NC VBB GND GND GND GND OMIT NC NC GND VCC VCC GND DATA DATA NC Functional Description No internal connect, used for mechanical strength only VBB Bias output Ground Ground Ground Ground No pin No internal connect, used for mechanical strength only No internal connect, used for mechanical strength only Ground Common supply voltage Common supply voltage Ground Data input Inverted Data input No internal connect, used for mechanical strength only Reference
Note 3 Note 3 Note 3 Note 3 Note 5 Note 5 Note 3 Note 1 Note 1 Note 3 Note 4 Note 4
HFBR-2116T Receiver Pin-Out Table
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Symbol NC DATA DATA VCC VCC VCC GND NC NC OMIT GND GND GND SD SD OMIT Functional Description No internal connect, used for mechanical strength only Inverted Data input Data input Common supply voltage Common supply voltage Common supply voltage Ground No internal connect, used for mechanical strength only No internal connect, used for mechanical strength only No pin Ground Ground Ground Signal Detect Inverted Signal Detect No pin Reference Note 4 Note 4 Note 1 Note 1 Note 1 Note 3 Note 5 Note 5 Note 3 Note 3 Note 3 Note 2, 4 Note 2, 4
Notes: 1. Voltages on VCC must be from the same power supply (they are connected together internally). 2. Signal Detect is a logic signal that indicates the presence or absence of an input optical signal. A logic-high, VOH, on Signal Detect indicates presence of an input optical signal. A logic-low, VOL, on Signal Detect indicates an absence of input optical signal. 3. All GNDs are connected together internally and to the internal shield. 4. DATA, DATA, SD, SD are open-emitter output circuits. 5. On metal-port modules, these pins are redefined as "Port Connection."
196
Specifications-Absolute Maximum Ratings
Parameter Storage Temperature Lead Soldering Temperature Lead Soldering Time Supply Voltage Data Input Voltage Differential Input Voltage Output Current Symbol TS TSOLD tSOLD VCC VI VD IO Min. -40 Typ. Max. 100 260 10 7.0 VCC 1.4 50 Unit C C sec. V V V mA Reference
-0.5 -0.5
Note 1
Recommended Operating Conditions
Parameter Ambient Operating Temperature Supply Voltage Data Input Voltage-Low Data Input Voltage-High Data and Signal Detect Output Load Symbol TA VCC VIL - VCC VIH - VCC RL Min. 0 4.5 -1.810 -1.165 Typ. Max. 70 5.5 -1.475 -0.880 Unit C V V V Reference
50
Note 2
HFBR-1116T Transmitter Electrical Characteristics
(TA = 0C to 70C, VCC = 4.5 V to 5.5 V) Parameter Supply Current Power Dissipation Threshold Voltage Data Input Current-Low Data Input Current-High Symbol ICC PDISS VBB - VCC IIL I IH Min. Typ. 145 0.76 -1.3 0 14 Max. 185 1.1 -1.24 350 Unit mA W V s s Reference Note 3 Note 5 Note 24
-1.42 -350
HFBR-2116T Receiver Electrical Characteristics
(TA = 0C to 70C, VCC = 4.5 V to 5.5 V) Parameter Supply Current Power Dissipation Data Output Voltage-Low Data Output Voltage-High Data Output Rise Time Data Output Fall Time Signal Detect Output Voltage-Low (De-asserted) Signal Detect Output Voltage-High (Asserted) Signal Detect Output Rise Time Signal Detect Output Fall Time Symbol ICC PDISS VOL - VCC VOH - VCC tr tf VOL - VCC VOH - VCC tr tf Min. Typ. 82 0.3 Max. 145 0.5 -1.620 -0.880 2.2 2.2 -1.620 -0.880 2.2 2.2 Unit mA W V V ns ns V V ns ns Reference Note 4 Note 5 Note 6 Note 6 Note 7 Note 7 Note 6 Note 6 Note 7 Note 7
-1.840 -1.045 0.35 0.35 -1.840 -1.045 0.35 0.35
197
HFBR-1116T Transmitter Optical Characteristics
(TA = 0C to 70C, VCC = 4.5 V to 5.5 V) Parameter Output Optical Power 62.5/125 m, NA = 0.275 Fiber Output Optical Power 50/125 m, NA = 0.20 Fiber Optical Extinction Ratio Output Optical Power at Logic "0" State Center Wavelength Spectral Width-FWHM -nm RMS Optical Rise Time Optical Fall Time Systematic Jitter Contributed by the Transmitter Random Jitter Contributed by the Transmitter Symbol PO, BOL PO, EOL PO, BOL PO, EOL Min. -19 -20 -22.5 -23.5 Typ. Max. -14 -14 -14 -14 0.03 -35 -45 1380 Unit dBm avg. dBm avg. % dB dBm avg. nm nm nm RMS ns ns ns p-p ns p-p Reference Note 8 Note 8 Note 9 Note 10 Note 23 Figure 9 Note 11, 23 Figure 9 Note 12, 23 Figure 9 Note 12, 23 Figure 9 Note 13 Note 14
0.001 -50 PO("0") C tr tf SJ RJ 0.6 0.6 1270 1310 137 58 1.0 2.1 0.04 0
3.0 3.0 1.2 0.52
HFBR-2116T Receiver Optical Characteristics
(TA = 0C to 70C, VCC = 4.5 V to 5.5 V) Parameter Symbol Input Optical Power PIN Min. (W) Minimum at Window Edge Input Optical Power Minimum at Eye Center Input Optical Power Maximum Operating Wavelength Systematic Jitter Contributed by the Receiver Random Jitter Contributed by the Receiver Signal Detect-Asserted Signal Detect-Deasserted Signal Detect-Hysteresis Signal Detect Assert Time (off to on) Signal Detect De-assert Time (on to off) 198 PIN Min. (C) PIN Max. SJ RJ PA PD PA-PD tSDA tSDD PD+1.5 dB -45 1.5 0 0 55 110 100 350 -14 1260 0.2 1 1360 1.2 1.91 -31 Min. Typ. Max. -31 -31 Unit dBm avg. dBm avg. dBm avg. nm ns p-p ns p-p dBm avg. dBm avg. dB s s Note 21 Note 22 Note 17 Note 18 Note 19 Note 20 Reference Note 15, Figure 10 Note 16, Figure 10 Note 15
Notes: 1. This is the maximum voltage that can be applied across the Differential Transmitter Data Inputs to prevent damage to the input ESD protection circuit. 2. The outputs are terminated with 50 connected to VCC - 2 V. 3. The power supply current needed to operate the transmitter is provided to differential ECL circuitry. This circuitry maintains a nearly constant current flow from the power supply. Constant current operation helps to prevent unwanted electrical noise from being generated and conducted or emitted to neighboring circuitry. 4. This value is measured with the outputs terminated into 50 connected to VCC - 2 V and an Input Optical Power level of -14 dBm average. 5. The power dissipation value is the power dissipated in the transmitter and receiver itself. Power dissipation is calculated as the sum of the products of supply voltage and currents, minus the sum of the products of the output voltages and currents. 6. This value is measured with respect to VCC with the output terminated into 50 connected to VCC - 2 V. 7. The output rise and fall times are measured between 20% and 80% levels with the output connected to VCC - 2 V through 50 . 8. These optical power values are measured with the following conditions: * The Beginning of Life (BOL) to the End of Life (EOL) optical power degradation is typically 1.5 dB per the industry convention for long wavelength LEDs. The actual degradation observed in HewlettPackard's 1300 nm LED products is < 1 dB, as specified in this data sheet. * Over the specified operating voltage and temperature ranges. * With 25 MBd (12.5 MHz squarewave) input signal. * At the end of one meter of noted optical fiber with cladding modes removed. The average power value can be converted to a peak power value by adding 3 dB. Higher output optical power transmitters are available on special request. 9. The Extinction Ratio is a measure of the modulation depth of the optical signal. The data "0" output optical power is compared to the data "1" peak output optical power and expressed as a percentage. With the transmitter driven by a 25 MBd
10.
11.
12.
13.
14.
15.
(12.5 MHz square-wave) signal, the average optical power is measured. The data "1" peak power is then calculated by adding 3 dB to the measured average optical power. The data "0" output optical power is found by measuring the optical power when the transmitter is driven by a logic "0" input. The extinction ratio is the ratio of the optical power at the "0" level compared to the optical power at the "1" level expressed as a percentage or in decibels. The transmitter will provide this low level of Output Optical Power when driven by a logic "0" input. This can be useful in link troubleshooting. The relationship between Full Width Half Maximum and RMS values for Spectral Width is derived from the assumption of a Gaussian shaped spectrum which results in a 2.35 X RMS = FWHM relationship. The optical rise and fall times are measured from 10% to 90% when the transmitter is driven by a 25 MBd (12.5 MHz square-wave) input signal. The ANSI T1E1.2 committee has designated the possibility of defining an eye pattern mask for the transmitter output optical power as an item for further study. HP will incorporate this requirement into the specifications for these products if it is defined. The HFBR-1116T transmitter typically complies with the template requirements of CCITT (now ITU-T) G.957 Section 3.25, Figure 2 for the STM-1 rate, excluding the optical receiver filter normally associatd with single-mode fiber measurements which is the likely source for the ANSI T1E1.2 committee to follow in this matter. Systematic Jitter contributed by the transmitter is defined as the combination of Duty Cycle Distortion and Data Dependent Jitter. Systematic Jitter is measured at 50% threshold using a 155.52, 27 - 1 pseudo-random bit stream data pattern input signal. Random Jitter contributed the the transmitter is specified with a 155.52 MBd (77.5 MHz square-wave) input signal. This specification is intended to indicate the performance of the receiver when Input Optical Power signal characteristics are present per the following definitions. The Input Optical Power dynamic range from the minimum level (with a window time-width) to the maximum level is the range over which the receiver is guaranteed to provide output data
16.
17.
18.
19.
20.
21.
22.
23.
24.
with a Bit-Error-Ratio (BER) better than or equal to 2.5 x 10-10. * At the Beginning of Life (BOL). * Over the specified operating voltage and temperature ranges. * Input is a 155.52 MBd, 223 - 1 PRBS data pattern with a 72 "1"s and 72 "0"s inserted per the CCITT (now ITU-T) recommendation G.958 Appendix 1. * Receiver data window time-width is 1.23 ns or greater for the clock recovery circuit to operate in. The actual test window time-width is set to simulate the effect of worst-case input optical jitter based on the transmitter jitter values from the specification tables. The test window time-width is 3.32 ns. All conditions of Note 15 apply except that the measurement is made at the center of the symbol with now window time-width. Systematic Jitter contributed by the receiver is defined as the combination of Duty Cycle Distortion and Data Dependent Jitter. The input optical power level is at the maximum of "PIN Min. (W)." Systematic Jitter is measured at 50% threshold using a 155.52 MBd (77.5 MHz square-wave), 27 - 1 pseudo-random bit stream data pattern input signal. Random Jitter contributed by the receiver is specified with a 155.52 MBd (77.5 MHz square-wave) input signal. This value is measured during the transition from low to high levels of input optical power. This value is measured during the transition from high to low levels of input optical power. The Signal Detect output shall be asserted, logic-high (VOH), within 100 s after a step increase of the Input Optical Power. Signal Detect output shall be deasserted, logic-low (VOL), within 350 s after a step decrease in the Input Optical Power. The HFBR-1116T transmitter complies with the requirements for the tradeoffs between center wavelength, spectral width, and rise/fall times shown in Figure 9. This figure is derived from the FDDI PMD standard (ISO/IEC 9314-3: 1990 and ANSI X3.166 - 1990) per the description in ANSI T1E1.2 Revision 3. The interpretation of this figure is that values of Center Wavelength and Spectral Width must lie along the appropriate Optical Rise/Fall Time curve. This value is measured with an output load RL = 10 k.
199

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