Agere Systems Inc.

5

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 abso-

lute 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.

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

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

Ω 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.

Parameter

Symbol

Min

Max

Unit

——

5.5

V

–40

85

°C

Storage Case Temperature Range

–40

85

°C

Lead Soldering Temperature/Time

—

—

250/10

°C/s

Relative Humidity (noncondensing)

RH

—

85

%

Minimum Fiber Bend Radius

—

1.00 (25.4)

—

in. (mm)

Parameter

Symbol

Min

Typ

Max

Unit

V

4.75

5.0

5.50

V

Power Supply Current Drain

—

30

130

mA

Low

High

–1.81

–1.16

—

—

–1.47

–0.88

V

V

—t/4

—

ns

—

V

Transmitter Enable Voltage

V

—

—

0.20

µs

—

—

2.00

µs

0.01

0.06

0.70

V

0.01

0.05

0.20

V