
C482, C484, and C486 (C48-Type)
2.5 Gbits/s Cooled Laser Transmitters
Data Sheet, Rev. 1
September 2002
Offering multiple output power options and SONET/SDH com-
patibility, the C48-Type 2.5 Gbits/s Cooled Laser Transmitters
are manufactured in a 24-pin plastic DIP with a single-mode
fiber pigtail.
Features
■
Data rates to 2.5 Gbits/s
■
Two-channel selectable at 100 GHz spacing
■
SONET and ITU-T compliant at OC-48 and
STM-16
■
Cooled, InGaAsP MQW-DFB laser
■
Wavelength range, 1528.77 nm—1563.86 nm
■
User-selectable wavelengths
■
Clocked or nonclocked operation with single-ended
inputs; clocked operation with differential input
■
50
ac-coupled PECL compatible data and clock
inputs
■
Operation from 3.3 V and 5 V power supplies
■
Low-profile, 24-pin package
■
Automatic optical power control
■
Wide operating case temperature range,
–15 °C to +70 °C
■
Laser bias monitor alarm/laser degrade alarm
■
Laser back-facet monitor output
■
Transmitter-enable input
■
FC/PC or SC/PC connectors
Applications
■
Telecommunications:
— SONET/SDH SR/IR/LR
— Subscriber loop
— Metropolitan area networks
■
High-speed data communications
Description
The C48-type 2.5 Gbits/s cooled laser transmitters
are designed for use in transmission systems and
high-speed data communication applications. The
transmitter operates at the SONET OC-48 rate, as
well as the ITU-T SDH rate of STM-16. The device
supports two wavelengths. The second wavelength
is selectable via pin 10.
The transmitters meet all present
Telcordia Technol-
ogies
TM
GR-253-CORE requirements and the ITU-T
G.957 and G.958 recommendations. They are also
ideally suited for extended-distance data and net-
working applications.
Manufactured in a 24-pin DIP, the transmitter incor-
porates a hermetic multiquantum well (MQW) iso-
lated 1550 nm digital distributed feedback (DFB)
laser (D2526 versions), an InGaAs PIN photodiode
back-facet monitor, and a GaAs laser driver IC. The
unit uses two power supplies. The laser transmitter
requires 3.3 V. The clock may be enabled for those
applications where jitter is critical.
Pin information is listed in Table 1.