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T92 Datasheet(PDF) 2 Page - Agere Systems |
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T92 Datasheet(HTML) 2 Page - Agere Systems |
2 / 8 page T92-Type 10 Gbits/s 1300 nm Advance Data Sheet Uncooled DFB Laser Transmitter March 2001 2 2 Agere Systems Inc. Description (continued) 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 can deform at temperatures greater than 85 °C. The transmitter pins can be wave-soldered at a maximum temperature of 250 °C for 10 seconds. Installation Considerations Although the transmitter has been designed with rug- gedness in mind, 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, the use of canned air with an extension tube should remove any debris. Other cleaning procedures are identified in the Cleaning Fiber-Optic Assemblies Tech- nical Note (TN95-010LWP). Laser Degrade-mode Alarm An output of the transmitter that indicates when the laser bias has reached its end-of-life condition. The transmitter will still function, but may not meet all speci- fications. The transmitter should be replaced when this alarm is active (active low). Specifically, this alarm indi- cates that the bias of the laser has changed more than 50% from its original value. Back-facet Monitor Output This is an analog output that indicates whether the transmitter has the correct optically generated back- facet current. It may be used for alarm purposes. It is referenced to VEE. Under normal operating conditions, this monitor will output a voltage that is nominally 500 mV above VEE. When the optical output power of the transmitter increases or decreases, this voltage will move proportionately. Bias Monitor Output This is an optional analog output voltage that indicates the bias current being supplied to the laser. It is refer- enced to VEE. The conversion for this monitor output is 20 mV for every 1 mA of bias current to the laser. For example, a 400 mV output above VEE would indicate 20 mA of bias current to the laser. Table 1. Pin Descriptions 1. Laser back-facet function is a customer-use option that is not required for normal operations of the transmitter and is normally used during manufacture and for diagnostics. 2. Laser temperature (°C) = (VTEMP – 0.5 V)/0.01 V, where VTEMP is the temperature monitor voltage. 3. This pin can be tied to ground. 4. For single-ended operation, data signal must be on pin 16, and DATA (pin 18) must 50 Ω terminated to ground; for single-ended clocked operation, clock signal must be on pin 20, and CLOCK (pin 22) must be 50 Ω terminated to ground. Pin Number Name 1VEE 2 Back-facet Monitor1 3 Bias Monitor 4 Tx Enable 5 Clock Select 6 Ground 7 Temperature Monitor2 8 Laser Degrade Alarm 9 NUC 10 NUC 11 NUC3 12 VEE 13 VCC 14 NUC3 15 Ground 16 DATA4 17 Ground 18 DATA4 19 Ground 20 CLOCK4 21 Ground 22 CLOCK4 23 Ground 24 VCC |
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