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Fiber Optic Transmitter and Receiver Data Links for 266 MBd Technical Data
HFBR-1119T Transmitter HFBR-2119T Receiver
Features
* Full Compliance with the Optical Performance Requirements of the Fibre Channel Physical Layer * Other Versions Available for: - FDDI - ATM * Compact 16-pin DIP Package with Plastic ST* Connector * Wave Solder and Aqueous Wash Process Compatible Package * Manufactured in an ISO 9001 Certified Facility
applications specified at 266 MBd for Fibre Channel applications or for general-purpose fiber optic data link transmission. 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.
Transmitter Applications
* Fibre Channel Interfaces * Multimode Fiber Optic Links up to 266 MBd at 1500 m * General Purpose, Point-toPoint Data Communications * Replaces DLT/R1040-ST2 Model Transmitters and Receivers 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.
coupled 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.
Description
The HFBR-1119/-2119 series of data links are high-performance, cost-efficient, transmitter and receiver modules for serial optical data communication
Receiver
The receiver utilizes an InGaAs PIN photodiode coupled to a custom silicon transimpedance preamplifier IC. The PINpreamplifier combination is ac-
*ST is a registered trademark of AT&T Lightguide Cable Connectors.
200
5965-3483E (8/96)
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.
201
8
OPTICAL PORT
OPTICAL PORT
OPTICAL POWER BUDGET - dB
7 6 5 62.5/125 m 4 3 2 50/125 m 1 0 0 0.5 1 1.5 2
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
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.
Hewlett-Packard LED technology has produced 1300 nm LED devices with lower aging characteristics than normally associated with these technologies in the industry. The industry convention is 1.5 dB aging for 1300 nm LEDs; however, HP 1300 nm LEDs will experience less than 1 dB of aging over normal commercial equipment mission-life periods. Contact your Hewlett-Packard sales representative for additional details. Figure 4 was generated with a Hewlett-Packard fiber-optic link model containing the current industry conventions for fiber cable specifications and Fibre Channel optical parameters. These parameters are reflected in the guaranteed performance of the transmitter and receiver specifications in this data sheet. This same model has been used extensively in the ANSI and IEEE committees, including the ANSI X3T9.5 committee, to establish the optical performance requirements for various fiber-optic interface standards. The cable parameters used come from the ISO/IEC JTC1/
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.
202
BIT ERROR RATIO
SC 25/WG3 Generic Cabling for Customer Premises per DIS 11801 document and the EIA/TIA-568-A Commercial Building Telecommunications Cabling Standard per SP-2840.
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 CENTER OF SYMBOL
Care should be taken to avoid shorting the receiver Data or Signal Detect Outputs directly to ground without proper currentlimiting impedance.
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). The specifications in this data sheet have all been measured using the standard Fibre Channel symbol rate of 266 MBd. The data link modules can be used for other applications at signaling rates different than specified in this data sheet. Depending on the actual signaling rate, there may be some differences in optical power budget. This is primarily caused by a change in receiver sensitivity. These data link modules can also be used for applications which require different bit-error-ratio (BER) performance. Figure 5 illustrates the typical trade-off between link BER and the receiver input optical power level.
Solder and Wash Process Compatibility
-4 -2 0 2
RELATIVE INPUT OPTICAL POWER - dB CONDITIONS: 1. 266 MBd 2. PRBS 27-1 3. TA = 25 C 4. VCC = 5 Vdc 5. INPUT OPTICAL RISE/FALL TIMES = 1.0/1.9 ns
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.
Figure 5. HFBR-1119T/2119T BitError-Ratio vs. Relative Receiver Input Optical Power.
The 1300 nm receiver will tolerate the worst-case input optical jitter allowed without violating the worst-case output electrical jitter allowed. The jitter specifications stated in the following transmitter and receiver specification tables are derived from the values in FC-PH Annex A.4.3 and A.4.4. They represent the worst-case jitter contribution that the transmitter and receiver are allowed to make to the overall system jitter without violating the allowed allocation. In practice, the typical jitter contribution of the Hewlett-Packard data link modules is well below the maximum allowed amounts.
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 6 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 6.
Data Link Jitter Performance
The Hewlett-Packard 1300 nm data link modules are designed to operate per the system jitter allocations stated in FC-PH Annex A.4.3 and A.4.4. The 1300 nm transmitter will tolerate the worst-case input electrical jitter allowed, without violating the worst-case output optical jitter requirements.
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-1119/ -2119 series meets MIL-STD-883C Method 3015.4 Class 2.
203
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 6. Recommended Interface Circuitry and Power Supply Filter Circuits.
204
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 7 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 6. Recommended Board Layout Hole Pattern.
205
Regulatory Compliance
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-1119T 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-1119/-2119 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).
c - TRANSMITTER OUTPUT OPTICAL SPECTRAL WIDTH (FWHM) - nm
220 200 180 160 140 120 100 80 60 1280 1300 1320 1340 1360 1380 TRANSMITTER OUTPUT OPTICAL RISE TIMES - ns tr = 1.8 ns tr = 1.9 ns tr = 2.0 ns tr = 2.1 ns tr = 2.2 ns
c - TRANSMITTER OUTPUT OPTICAL CENTER WAVELENGTH - nm HFBR-1119T TYPICAL TRANSMITTER TEST RESULTS OF c, AND tr ARE CORRELATED AND COMPLY WITH THE ALLOWED SPECTRAL WIDTH AS A FUNCTION OF CENTER WAVELENGTH FOR VARIOUS RISE AND FALL TIMES.
Figure 8. Typical 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 -1.5
-1
-0.5
0
0.5
1
1.5
EYE SAMPLING TIME POSITION - ns CONDITIONS: 1. TA = 25 C 2. VCC = 5 Vdc 3. INPUT OPTICAL RISE/FALL TIMES = 1.0/1.9 ns 4. INPUT OPTICAL POWER IS NORMALIZED TO CENTER OF DATA SYMBOL 5. NOTES 11 AND 12 APPLY
Figure 9. HFBR-2119T Receiver Relative Input Optical Power vs. Eye Sampling Time Position.
206
HFBR-1119T 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-2119T 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."
207
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 Note 2
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 3
HFBR-1119T 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. 165 0.86 -1.3 0 14 Max. 185 1.1 -1.24 350 Unit mA W V A A Reference Note 4 Note 16 Note 21
-1.42 -350
HFBR-2119T 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 Signal Detect Assert Time (off to on) Sighal Detect De-assert Time (on to off) 208 Symbol ICC PDISS VOL - VCC VOH - VCC tr tf VOL - VCC VOH - VCC tr tf tSDA tSDD Min. Typ. 100 0.3 Max. 165 0.5 -1.620 -0.880 2.2 2.2 -1.620 -0.880 2.2 2.2 100 350 Unit mA W V V ns ns V V ns ns s s Reference Note 15 Note 16 Note 17 Note 17 Note 18 Note 18 Note 17 Note 17 Note 18 Note 18 Note 19 Note 20
-1.840 -1.045 0.35 0.35 -1.840 -1.045 0.35 0.35 0 0
55 110
HFBR-1119T 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 Center Wavelength Spectral Width-FWHM Optical Rise Time Optical Fall Time Deterministic Jitter Contributed by the Transmitter Random Jitter Contributed by the Transmitter Symbol PO, BOL PO, EOL PO, BOL Min. -19 -20 -22.5 Typ. Max. -14 -14 -14 0.03 -35 1380 Unit dBm avg. dBm avg. % dB nm nm 2.0 2.2 0.08 0.30 0.03 0.11 ns ns ns rms ns p-p ns p-p ns p-p Reference Note 5 Note 5 Note 6 Note 7 Figure 8 Note 7 Figure 8 Note 8 Figure 8 Note 8 Figure 8 Note 9 Note 10
C tr tf DJC RJC
1280
1308 137
0.6 0.6
HFBR-2119T 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 Signal Detect-Asserted Signal Detect-De-asserted Signal Detect-Hysteresis Deterministic Jitter Contributed by the Receiver Random Jitter Contributed by the Receiver PIN Min. (C) PIN Max. PA PD PA-PD DJC RJC -14 1270 PD+1.5 dB -45 1.5 2.4 0.24 0.90 0.26 0.97 1380 -27 Min. Typ. Max -26 -28 Unit dBm avg. dBm avg. dBm avg. nm dBm avg. dBm avg. dB ns rms ns p-p ns rms ns p-p Note 9, 11 Note 10, 11 Note 13, 19 Note 14, 20 Reference Note 11 Figure 9 Note 12 Figure 9 Note 11
209
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. When component testing these products, do not short the receiver Data or Signal Detect outputs directly to ground to avoid damage to the part. 3. The outputs are terminated with 50 connected to VCC - 2 V. 4. 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. 5. These optical power values are measured as follows: * 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 < 1dB, 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. 6. 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 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. 7. This parameter complies with the requirements for the tradeoffs between center wave length, spectral width, and rise/fall times shown in Figure 8. 8. 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. This parameter complies with the requirements for the tradeoffs between center wavelength, spectral width, and rise/fall times shown in Figure 8. 9. Deterministic Jitter is defined as the combination of Duty Cycle Distortion and Data Dependent Jitter. Deterministic Jitter is measured with a test pattern consisting of repeating K28.5 (00111110101100000101) data bytes and evaluated per the method in FC-PH Annex A.4.3. 10. Random Jitter is specified with a sequence of K28.7 (square wave of alternating 5 ones and 5 zeros) data bytes and, for the receiver, evaluated at a Bit-Error-Ratio (BER) of 1 x 10-12 per the method in FC-PH Annex A.4.4. 11. 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 with a Bit-Error-Ratio (BER) better than or equal to 1 x 10-12. * At the Beginning of Life (BOL). * Over the specified operation temperature and voltage ranges. * Input symbol pattern is a 266 MBd, 27 - 1 pseudo-random bit stream data pattern. * Receiver data window time-width is 0.94 ns or greater and centered at mid-symbol. This data window time width is calculated to simulate the effect of worst-case input jitter per FC-PH Annex J and clock recovery sampling position in order to insure good operation with the various FC-0 receiver circuits. * The maximum total jitter added by the receiver and the maximum total jitter presented to the clock recovery circuit comply with the maximum limits listed in Annex J,
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
but the allocations of the Rx added jitter between deterministic jitter and random jitter are different than in Annex J. All conditions of Note 11 apply except that the measurement is made at the center of the symbol with no window time-width. 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. These values are measured with the outputs terminated into 50 connected to VCC - 2 V and an input optical power level of -14 dBm average. The power dissipation value is the power dissipated in the transmitter or the receiver itself. Power dissipation is calculated as the sum of the products of supply voltage and supply current, minus the sum of the products of the output voltages and currents. These values are measured with respect to VCC with the output terminated into 50 connected to VCC - 2 V. The output rise and fall times are measured between 20% and 80% levels with the output connected to VCC - 2 V through 50 . 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. This value is measured with an output load RL = 10 k.
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