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Agere Systems Inc.

Data Sheet

September 1999

1241/1243/1245-Type Uncooled Laser Transmitter

Table 3. Optical Characteristics

1. Output power definitions and measurement per ITU-T Recommendation G.957 and G.958.

2. Ratio of logic 1 to logic 0 power levels.

3. Between 10% and 90% (50% duty cycle).

4. 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

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

Ω terminations since this termination is included inside the module.

Figure 2. dc-Coupled, Differential Input

Parameter

Symbol

Min

Typ

Max

Unit

See Ordering Information.

dBm

10

—

—

dB

OC-3/STM-1

OC-12/STM4

1062.5 Mbits/s

—

—

—

—

—

—

1.0

0.5

0.37

ns

ns

ns

Center Wavelength

λ

See Ordering Information.

nm

∆λ

——

4

nm

SMSR

30

—

—

dB

ECL

DRIVER

D

TRANSMITTER

15

16

50 •*

360 •

360 •

VEE

D

VEE

50 •*

0.1 µF

50 • MICROSTRIP OR STRIPLINE-

CONTROLLED IMPEDANCE TRACES