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1241CALC Datasheet(PDF) 4 Page - Agere Systems |
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1241CALC Datasheet(HTML) 4 Page - Agere Systems |
4 / 12 page 4 Agere Systems Inc. Data Sheet 1241/1243/1245-Type Uncooled Laser Transmitter 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 trans- mitter and interfacing circuitry. Input signal paths should be kept as short and as straight as possible; dif- ferential signal lines should be equal in length, and controlled-impedance stripline or microstrip construc- tion should always be used when laying out the printed- wiring board traces for the data lines. The Recom- mended User Interfaces section of this data sheet shows several methods of interfacing to the transmitter. Power Supplies The transmitter is configured for operation from either a single +5 V power supply or a single –5 V power sup- ply. 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 sup- ply, 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 tun- ing 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 pat- tern eye opening. Connector Options The standard optical fiber pigtail is 8 µm core single- mode fiber having a 0.036 in. (914 µm) diameter tight- buffered 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 evalu- ation. ESD voltage thresholds are dependent on the critical parameters used to define the model. A stan- dard HBM (resistance = 1.5 k Ω, capacitance = 100 pF) is widely used and, therefore, can be used for compari- son purposes. The HBM ESD withstand voltage estab- lished for the 1241-/1243-TypeTransmitter is ±1000V. Transmitter Processing The transmitter can withstand normal wave-soldering processes. The complete transmitter module is not her- metically 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 wave- soldered 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 techni- cal note, Cleaning Fiber-Optic Assemblies (TN95- 010LWP). |
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