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Data Sheet September 1999
1241/1243/1245-Type Uncooled Laser Transmitter
Features
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Backward compatible with 1227/1229/1238-Type Laser Transmitters Space-saving, self-contained, 20-pin DIP Uses field-proven, reliable InGaAsP MQW laser Requires single 5 V power supply SONET/SDH compatible Uncooled laser with automatic optical power control for constant output power over case temperature range No thermoelectric cooler required; reduces size and power consumption Uses low-power dissipation CMOS technology Qualified to meet the intent of Bellcore reliability practices Operates over data rates to 1062.5 Mbits/s (NRZ) Operation at 1.3 m or 1.55 m wavelength Typical average output power options of -11 dBm, -8 dBm, -5 dBm, -2 dBm, and 0 dBm ECL compatible, differential inputs Operating temperature range of -40 C to +85 C Transmitter-disable option
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Offering multiple output power options and SONET/SDH compatibility, the 1241/1243-Type Uncooled Laser Transmitter is manufactured in a 20-pin, plastic DIP with a single-mode fiber pigtail.
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Applications
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Telecommunications -- Inter- and intraoffice SONET/ITU-T SDH -- Subscriber loop -- Metropolitan area networks High-speed data communications -- Fibre channel (FC-0)
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1241/1243/1245-Type Uncooled Laser Transmitter
Data Sheet September 1999
Description
The 1241/1243/1245-type Laser Transmitters are designed for use in transmission systems and highspeed data communication applications. Used in intraoffice and intermediate-reach applications, the transmitters are configured to operate at SONET rates up to OC-12, as well as at ITU-T synchronous digital hierarchy (SDH) rates up to STM-4. Specific versions are also capable of operating up to 1062.5 Mbits/s. The transmitter meets all present Bellcore GR-253CORE requirements, ANSI T1.117-1991 SONET single-mode, and the ITU-T G.957 and G.958 recommendations. (See Table 5 to select transmitters for the various SONET/SDH segments.) The transmitter requires a single power supply (+5 V or -5 V) and operates over data rates of 1 Mbits/s to 622 Mbits/s (NRZ). Automatic power control circuitry provides constant optical output power over the operating case temperature range. The automatic power control circuitry also compensates for laser aging. The optical wavelength tolerance at 25 C is 1310 nm. The temperature coefficient of wavelength for 1.3 m FabryPerot transmitters (1241-Type) is approximately 0.4 nm/C. The temperature coefficient of wavelength for 1.3 m and 1.55 m distributed-feedback (DFB) transmitters (1243/1245-Type) is approximately 0.1 nm/C. Transmitters are available for operation over several different temperature ranges from -40 C to +85 C. Manufactured in a 20-pin DIP the transmitter consists of a , hermetic, InGaAs laser and a single CMOS driver IC. The low-power consumption circuit provides modulation, automatic optical output power control, and data reference. The module can be driven by either ac- or dc-coupled data in single-ended or differential configuration. (See Recommended User Interfaces section for typical connection schemes.) The laser bias and backfacet monitor currents are electrically accessible for transmitter performance monitoring. The transmitter optical output may be disabled by a logic-level input.
todetector diode within the laser module provides an indication of the laser's average optical output power. The back-facet diode current is accessible as a voltage proportional to photocurrent through pins 17 and 19 on the transmitter. The back-facet diode also forms part of the feedback control circuit, which helps maintain constant output power. The laser bias current is accessible as a dc-voltage by measuring the voltage developed across pins 2 and 4 of the transmitter. Dividing this voltage by 10 will yield the value of the laser bias current. This value will change up or down in response to operating temperature, power supply voltage, data pattern, and laser aging characteristics. Table 1. Pin Descriptions Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name No user connection* Laser bias monitor (+) No user connection* Laser bias monitor (-) VEE VCC Transmitter disable VCC VCC No user connection Case ground (RF ground) VCC Case ground (RF ground) VEE DATA DATA Laser back-facet monitor (-) * VCC Laser back-facet monitor (+)* No user connection
Functional Overview
Transmitter Circuit Description and Operation
Figure 1 shows a simplified schematic of the transmitter; pin information is listed in Table 1. The laser within the transmitter is driven by a single CMOS integrated circuit, which provides the input data signal reference level with automatic, temperature-compensated laser bias, and modulation-current control. A back-facet pho2
* Pins designated as no user connection should not be tied to ground or any other circuit potential. Laser back-facet and bias monitor functions are customer-use options that are not required for normal operations of the transmitter. They are normally used during manufacture and for diagnostics.
Agere Systems Inc.
Data Sheet September 1999
1241/1243/1245-Type Uncooled Laser
Functional Overview (continued)
VCC
LASER BACK-FACET DETECTOR (2) (+) LASER BIAS MONITOR VOLTAGE (4) (-) 15 k* (+) (19) 15 k* 15 k* FIBER PIGTAIL
LASER BACK-FACET MONITOR VOLTAGE (17) (-) 15 k*
BAND GAP REFERENCE
AUTOMATIC POWER CONTROL CIRCUITRY
IBF 10 *
(16) DATA 30 k* VCC - 1.3 V INPUT DATA COMPARATOR
t
TEMPERATURE SENSOR
MODULATION CIRCUITRY
IBIAS IMOD
30 k* (15) DATA TRANSMITTER DISABLE (7)
1-868(C).h
Figure 1. Simplified Transmitter Schematic Input Data Input Data Data enters the transmitter through a comparator. These inputs have internal pull-down resistors to a voltage reference that is 1.3 V below VCC. This configuration allows the transmitter to be driven from either a single-ended or a differential input signal. Since the input is a comparator instead of a gate, the absolute input signal levels are not important when the inputs are driven differentially. When driven single-ended, however, the input signal voltage should be centered around VCC - 1.3 V to eliminate pulse-width distortion. With a single-ended input, either input can be used and the unused input can be left as an open circuit due to the internal reference shown in Figure 1. The optical output signal will be in the same sense as the input data--an input logic high turns the laser diode on and an input logic low turns the laser diode off. However, if the negative input is used with a single-ended data Agere Systems Inc. input signal, the optical signal will be the complement of the data input signal. The differental inputs of the 1241 Gbit versions are terminated internally with 100 between the DATA and DATA inputs. Minimum Data Rate Because the modulation and bias control circuitry are influenced by the input data pattern, the standard transmitter cannot be used in burst-mode type applications. For burst-mode applications, please contact your Agere Account Manager. The minimum data rate (pseudorandom data, 50% average duty cycle) for the 1241/1243/1245-Type Transmitters is approximately 1 Mbit/s.
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1241/1243/1245-Type Uncooled Laser Transmitter
Data Sheet September 1999
Functional Overview (continued)
Since most applications operate at very high data rates, high-frequency design techniques need to be used to ensure optimum performance from the transmitter and interfacing circuitry. Input signal paths should be kept as short and as straight as possible; differential signal lines should be equal in length, and controlled-impedance stripline or microstrip construction should always be used when laying out the printedwiring board traces for the data lines. The Recommended User Interfaces section of this data sheet shows several methods of interfacing to the transmitter.
Connector Options
The standard optical fiber pigtail is 8 m core singlemode fiber having a 0.036 in. (914 m) diameter tightbuffered outer-jacket. The standard length is 39 in. 4 in. (1 m 10 cm) and can be terminated with either an SC or FC-PC optical connector. Other connector options may be available on special order. Contact your Agere Account Manager for ordering information.
Handling Precautions
CAUTION: This device is susceptible to damage as a result of electrostatic discharge (ESD). Take proper precautions during both handling and testing. Follow guidelines such as JEDEC Publication No. 108-A (Dec. 1988). Although protection circuitry is designed into the device, take proper precautions to avoid exposure to ESD. Agere employs a human-body model (HBM) for ESD-susceptibility testing and protection-design evaluation. ESD voltage thresholds are dependent on the critical parameters used to define the model. A standard HBM (resistance = 1.5 k, capacitance = 100 pF) is widely used and, therefore, can be used for comparison purposes. The HBM ESD withstand voltage established for the 1241-/1243-TypeTransmitter is 1000V.
Power Supplies
The transmitter is configured for operation from either a single +5 V power supply or a single -5 V power supply. For positive power supply operation, connect Vcc to the +5 V power supply and connect VEE to ground or circuit common. For operation from a -5 V power supply, connect VCC to ground and connect VEE to the -5 V power supply. Whichever option is chosen, the VCC or VEE connection to the transmitter should be well filtered to prevent power supply noise from interfering with transmitter operation.
Transmitter Specifications
Optical Output Power During manufacture, the optical output power of every transmitter is tuned to the typical value specified in the data sheet for that particular transmitter code. The tuning is performed at room ambient and a power supply voltage of 5 V. The minimum and maximum values listed in the data sheet for each code group reflect the worst-case limits that the transmitter is expected to operate within over its lifetime and over the allowed power supply and the operating temperature range. Every transmitter shipped receives a final test, which includes a SONET eye-mask test at either the OC-3 (STM-1) data rate of 155.52 Mbits/s, the OC-12 (STM4) data rate of 622.08 Mbits/s, or the fibre channel FC-0 data rate of 1062.5 Mbits/s. The eye-mask test is meant to examine the performance of the transmitter's output optical waveform relative to a minimum data pattern eye opening.
Transmitter Processing
The transmitter can withstand normal wave-soldering processes. The complete transmitter module is not hermetically sealed; therefore, it should not be immersed in or sprayed with any cleaning solution or solvents. The process cap and fiber pigtail jacket deformation temperature is 85 C. Transmitter pins can be wavesoldered at maximum temperature of 250 C for 10 seconds.
Installation Considerations
Although the transmitter features a robust design, care should be used during handling. The optical connector should be kept free from dust, and the process cap should be kept in place as a dust cover when the device is not connected to a cable. If contamination is present on the optical connector, canned air with an extension tube can be used to remove any debris. Other cleaning procedures are identified in the technical note, Cleaning Fiber-Optic Assemblies (TN95010LWP). Agere Systems Inc.
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Data Sheet September 1999
1241/1243/1245-Type Uncooled Laser
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Parameter Supply Voltage* Range Operating Case Temperature Symbol -- TC Tstg -- RH -- Min -- -40 -40 -- -- 1.00 (25.4) Max 5.5 85 85 250/10 85 -- Unit V C C C/s % in. (mm)
Storage Case Temperature Range Lead Soldering Temperature/Time Relative Humidity (noncondensing) Minimum Fiber Bend Radius
* With VEE connected to -5 V, VCC must be at 0 V; with VCC connected to +5 V, VEE must be at 0V. Specification depends upon the code ordered. The device is capable of a cold start at -40 C; specifications are met after a warm-up time determined by the system thermal design.
Characteristics
Minimum and maximum values specified over operating case temperature range at 50% duty cycle data signal and end of life (EOL).Typical values are measured at beginning-of-life (BOL) room temperature unless otherwise noted. Table 2. Electrical Characteristics Parameter Power Supply Voltage1 Power Supply Current Drain Input Data Voltage:2 Low High Input Transition Time3 Transmitter Disable Voltage4 Transmitter Enable Voltage Output Disable Time5 Output Enable Time6 Laser Bias Voltage7 Laser Monitor Voltage (50% duty cycle)8 Symbol V ITOTAL VIL VIH tI VD VEN tD tEN VB VBF Min 4.75 -- -1.81 -1.16 -- VCC - 2.0 VEE -- -- 0.01 0.01 Typ 5.0 30 -- -- t/4 -- -- -- -- 0.06 0.05 Max 5.50 130 -1.47 -0.88 -- VCC VEE + 0.8 0.20 2.00 0.70 0.20 Unit V mA V V ns V V s s V V
1. With VEE connected to -5V, V CC must be at 0 V; with VCC connected to +5 V, VEE must be at 0 V. 2. Input measured from VCC with 50 load to (VCC - 2 V). 10K, 10K H, and 100K ECL compatible. 3. Between 10% and 90% (50% duty cycle) where t is the bit period in ns. 4. The transmitter is normally enabled and only requires an external voltage to disable. 5. Time measured from rising edge of disable signal until optical output (laser diode) has turned off. 6. Time measured from falling edge of enable signal until optical output has stabilized at nominal output power level. 7. The laser bias current is obtained by dividing the bias voltage by the 10 current-sensing resistors. (See Figure 1.) When measuring these voltages or using them in conjunction with alarm circuits, use a high-input impedance device. 8. The laser back-facet monitor voltage is a scaled output that tracks the transmitter optical output power.
Agere Systems Inc.
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1241/1243/1245-Type Uncooled Laser Transmitter
Data Sheet September 1999
Characteristics (continued)
Table 3. Optical Characteristics Parameter Average Power Output Options1 Extinction Ratio2 Optical Rise and Fall Times 3: OC-3/STM-1 OC-12/STM4 1062.5 Mbits/s Center Wavelength RMS Spectral Width4 Side-mode Suppression Ratio5
1. 2. 3. 4.
Symbol PO rE tR, tF tR, tF tR, tF SMSR
Min 10 -- -- -- -- 30
Typ -- -- -- -- -- --
Max -- 1.0 0.5 0.37 4 --
Unit dBm dB ns ns ns nm nm dB
See Ordering Information.
See Ordering Information.
Output power definitions and measurement per ITU-T Recommendation G.957 and G.958. Ratio of logic 1 to logic 0 power levels. Between 10% and 90% (50% duty cycle). Root-mean-square spectral width accounts for modes up to and including those 20 dB down from the central mode. (Applies to 1241-Type only.) 5. Applies to 1243/1245-Type only.
Recommended User Interfaces
VEE 360 *
50 * MICROSTRIP OR STRIPLINECONTROLLED IMPEDANCE TRACES 16
ECL DRIVER 50 ** 360 *
D TRANSMITTER 15 50 ** D
VEE
0.1 F
1-496(C).c
* Locate these components as close to DATA/DATA inputs as possible. Note: The 1241 gigabit version does not require the external 50 terminations since this termination is included inside the module.
Figure 2. dc-Coupled, Differential Input
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Agere Systems Inc.
Data Sheet September 1999
1241/1243/1245-Type Uncooled Laser
Recommended User Interfaces (continued)
15 D 50 * COAX OR 50 * STRIPLIN E 50 * V CC - 2 V (CUSTOMER SU PPLIED ) TRANSMITTER 16 D
1.0 F
1-497(C)
Note: Input can also be connected to DATA; unused input pin remains unconnected. (622 Mbits/s and below only.)
Figure 3. dc-coupled, Single-Ended Input
VCC
50 * COAX OR 50 * STRIPLINE
619 *
*
15 D TRANSMITTER D
1.0 F
16
1.0 F
50 *
27 *
*
1960 * VEE
*
1-498(C)
* This network introduces a slight offset between DATA and DATA, which turns the laser transmitter off when there is no data present at the inputs. (622 Mbits/s and below only.)
Figure 4. ac-Coupled, Single-Ended Input
Qualification and Reliability
To help ensure high product reliability and customer satisfaction, Agere Systems is committed to an intensive quality program that starts in the design phase and proceeds through the manufacturing process. Optoelectronics modules are qualified to Agere Systems internal standards using MIL-STD-883 test methods and procedures and using sampling techniques consistent with Bellcore requirements. The 1241/1243/1245 series of transmitters have undergone an extensive and rigorous set of qualification tests. This qualification program fully meets the intent of Bellcore reliability practices TR-NWT-000468 and TA-NWT-000983. In addition, the design, development, and manufacturing facility of the Optoelectronics unit at Agere Systems has been certified to be in full compliance with the latest ISO-9001 Quality System Standards. Agere Systems Inc. 7
1241/1243/1245-Type Uncooled Laser Transmitter
Data Sheet September 1999
Outline Diagram
Dimensions are in inches and (millimeters). Unless otherwise noted, tolerances are 0.005 in (0.127 mm).
1.339 (34.01)
0.950 (24.13)
PIN 1 INDICATOR
0.144 (3.66)
0.635 (16.14)
TOP VIEW
0.350 (8.89)
0.125 (3.18) 0.110 (2.80)
0.100 (2.54) 0.900 (22.86)
0.018 (0.46)
PIN 11
PIN 20
0.400 (10.16)
PIN 10 BOTTOM VIEW
PIN 1
1-987C).a
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Agere Systems Inc.
Data Sheet September 1999
1241/1243/1245-Type Uncooled Laser
Laser Safety Information
Class I Laser Product
All versions of the 1241/1243/1245-Type transmitters are Class I laser products per CDRH, 21 CFR 1040 Laser Safety requirements. The 1241/1243/1245-Type transmitters have been classified with the FDA under accession number 8720009. All versions are Class I laser products per IEC 825-1:1993. CAUTION: Use of controls, adjustments, and procedures other than those specified herein may result in hazardous laser radiation exposure. This product complies with 21 CFR 1040.10 and 1040.11. 8.8 m single-mode pigtail with connector Wavelength = 1.3 m Maximum power = 1.6 mW Notice Unterminated optical connectors may emit laser radiation. Do not view with optical instruments.
Table 4. Ager eTransmitters for SONET/SDH Applications 1.3 m Transmitter Type* Connector Type Short and Intermediate Reach (<2 km and ~15 km) OC-3/ STM-1 FC-PC SC 1241FAUC 1241CAUC OC-12/ STM-4 1241FBUC 1241CBUC Long Reach ~40 km OC-3/ STM-1 1243FAFD 1243CAFD OC-12/ STM-4 1243FBDC 1243CBDC 1.55 m Transmitter Type Long Reach ~80 km OC-3/ STM-1 1245FAFC 1245CAFC OC-12/ STM-4 1245FBDC 1245CBDC
* Full SONET/SDH compliance, -40 C to +85 C. Full SONET/SDH compliance, -20 C to +70 C.
Agere Systems Inc.
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1241/1243/1245-Type Uncooled Laser Transmitter
Data Sheet September 1999
Ordering Information
Table 5. 1241/1243/1245-Type Transmitter Ordering Information OC-3/STM-1 Transmitter Codes Operating Case Temp. Range (C) Min 0 0 0 0 0 0 -20 -20 -40 -40 -40 -40 -40 -40 0 0 0 -20 -20 -40 -40 -40 -40 -40 10 10 10 Max 65 65 65 65 65 65 70 70 85 85 85 85 85 85 65 65 65 70 70 85 85 85 85 85 65 65 65 Average Output Power (dBM) Min -3 -3 -5 -5 -8 -8 -5 -5 -5 -5 -12 -12 -15 -15 -3 -3 -8 -3 -3 -3 -3 -12 -15 -15 -11 -11 -3 Typ 0 0 -2 -2 -5 -5 -2 -2 -2 -2 -8 -8 -11 -11 0 0 -5 0 0 0 0 -8 -11 -11 -8 -8 0 Max 2 2 0 0 -2 -2 0 0 0 0 -5 -5 -8 -8 2 2 -2 2 2 2 2 -5 -8 -8 -5 -5 2 Center Wavelength (nm) Min 1290 1290 1280 1280 1260 1260 1480 1480 1280 1280 1260 1260 1260 1260 1290 1290 1260 1480 1480 1280 1280 1260 1260 1274 1260 1260 1290 Max 1330 1330 1335 1335 1360 1360 1580 1580 1335 1335 1360 1360 1360 1360 1330 1330 1360 1580 1580 1335 1335 1360 1360 1356 1360 1360 1330 FC-PC SC FC-PC SC SC FC-PC SC FC-PC SC FC-PC SC FC-PC SC FC-PC FC-PC SC FC-PC SC FC-PC FC-PC SC FC-PC FC-PC SC FC-PC FC-PC FC-PC 1227AE 1227AF 1227YA 1227YB 1227CA 1227C 1229CB5 1229FB5 1227YD 1227YE 1227FB 1227F 1227HA 1227H 1227AK 1227AN 1227D 1229CA5 1229FA5 1229FA 1229CA 1227G 1227AC 1227PG 1238A 1238B 1238C 1241FADC 1241CADC 1241FAFC 1241CAFC 1241CALC 1241FALC 1245CAFC 1245FAFC 1243CAFD 1243FAFD 1241CAPC 1241FAPC 1241CAUC * 1241FAUC* 1241FBDC 1241CBDC 1241FBLC 1245CBDC 1245FBDC 1243FBDC 1243CBDC 1241FBPC 1241FBUC* 1241CBU* 1241FCPC 1241FCPD 1241FCDC 108123449 108123480 108123357 108123373 108123324 108123563 108400409 108400417 108123423 108123415 108123282 108123266 108123209 108123159 108123456 108123498 108123316 108400391 108400425 108123506 108123522 108123274 108123167 108123217 108309287 108309295 108309279 Connector 122x Equivalent Product Order Code Comcode
OC-12/STM-4 Transmitter Codes
Fibre Channel--1062.5 Mbits/s
* for these codes is 2.5 nm maximum. All other 1241-type codes are 4 nm maximum.
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Agere Systems Inc.
Data Sheet September 1999
1241/1243/1245-Type Uncooled Laser
Part Numbering for the 1241/1243/1245-Type Transmitter
124XXXXX Field Description Laser Type: 1 = 1.3 m Fabry-Perot laser, 3 = 1.3 m DFB laser, 5 = 1.55 m DFB laser Optical Connector: C = SC, F = FC/PC Data Rate: A = 155 Mbits/s, B = 622 Mbits/s, C = 1062.5 Mbits/s Typical Power: D = 0 dBm, F = -2 dBm, L = -5 dBm, P = -8 dBm, U = -11 dBm Customer Options: A--F
Table 6. Related Products Description Device Number Document Number DS99-072LWP DS99-071LWP
155 Mbits/s and 622 Mbits/s for SONET/ 1340-Type Pin Receiver SDH Applications 155 Mbits/s and 622 Mbits/s Receivers 1345-Type Pin Receiver with Clock and with Clock and Data Recovery for Data Recovery SONET/SDH Applications
Agere Systems Inc.
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For additional information, contact your Agere Systems Account Manager or the following: INTERNET: http://www.agere.com E-MAIL: docmaster@agere.com N. AMERICA: Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA: Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon Tel. (852) 3129-2000, FAX (852) 3129-2020 CHINA: (86) 21-5047-1212 (Shanghai), (86) 10-6522-5566 (Beijing), (86) 755-695-7224 (Shenzhen) JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 778-8833, TAIWAN: (886) 2-2725-5858 (Taipei) EUROPE: Tel. (44) 7000 624624, FAX (44) 1344 488 045
Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liabi lity is assumed as a result of their use or application.
Copyright (c) 2001 Agere Systems Inc. All Rights Reserved
September 1999 DS99-228LWP (Replaces DS99-073LWP)

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