Oplink Communications, Inc.

Parameter

Symbol

Minimum

Maximum

Units

Storage Temperature

T

ST

- 40

+ 85

°C

“I” option (SR & IR only)

V

OP

- 40

+ 85

°C

“H” option

0

+ 70

Supply Voltage

V

0

+ 6.0

V

Input Voltage

V

V

EE

V

V

Lead Soldering Temperature & Time

-

-

260°C, 10 sec

Absolute Maximum Ratings

OC-48/STM-16 Transmitter

STX48 Series

The STX48 modules are laser transmitters designed to meet or exceed

the SONET/SDH optical interface requirements at OC-48/STM-16 (2.5

Gb/s) data rate. Many performance versions are available which are fully

compliant with Short Reach, Intermediate Reach and Long Reach specifi-

cations at 1310 nm or 1550 nm wavelength. The Short Reach version uses

uncooled Fabry Perot lasers while the Intermediate Reach version uses

uncooled DFB lasers. For the Long Reach version, uncooled DFB lasers

with internal optical isolators are used. All modules satisfy Class I Laser

Safety requirements in accordance with the US FDA/CDRH and interna-

tional IEC-825 standards.

The transmitter incorporates an Automatic Power Control (APC) circuit to

maintain the optical output power at a constant level against variations

in ambient temperature and device aging. It also features a Mode Selec-

tor input pin which selects between clocked and non-clocked operation.

In the clocked operation mode, the input DATA is resynchronized by the

input CLOCK before driving the laser diode in order to reduce output jit-

ter to a minimum. A Transmitter Disable control input is also provided.

Both the laser bias current and back-facet light output can be monitored

as well.

All STX48 transmitter modules are available in two power supply options:

single +5V and single -5 V. The DATA and CLOCK interface can either be

direct PECL/ECL or via AC coupling. The operating temperature range is

-40°C to +85°C for the Short Reach and Intermediate Reach 1310 nm ver-

sion and 0°C to +70°C for the Long Reach version. All modules are housed

in a 24-pin dual-in-line metal package with a single mode fiber pigtail,

which is terminated with ST, FC or SC connector.

Product Description



Fully compliant with SONET/SDH OC-48/ STM-16

(2.5 Gb/s) specifications



Long Reach 1310 nm & 1550 nm as well as

Intermediate Reach and Short Reach



Eye Safe (Class I Laser Safety)



Mode Selector switch between Clocked or Non-

clocked operation



-40°C to +85°C Operating Temperature

(Intermediate Reach and Short Reach)



24-pin DIP metal package



FC, ST, SC-connectorized fiber pigtails



Differential PECL DATA & CLOCK interface



Single +5 V and - 5 V supply option

Features

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