T92-Type 10 Gbits/s 1300 nm

Advance Data Sheet

Uncooled DFB Laser Transmitter

March 2001

2

2

Agere Systems Inc.

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

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

this monitor will output a voltage that is nominally

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-

20 mV for every 1 mA of bias current to the laser. For

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.

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

22) must be 50

Ω terminated to ground.

Pin Number

Name

2

3

Bias Monitor

4

Tx Enable

5

Clock Select

6

Ground

7

8

Laser Degrade Alarm

9

NUC

10

NUC

11

12

13

14

15

Ground

16

17

Ground

18

19

Ground

20

21

Ground

22

23

Ground

24