RP00244X.DOC page 1 from 3 Juli 2, 1997
Optical Receiver Module SRP00244x
(Photodiode with Preamplifier) SRP00245x
Preliminary Data
l InGaAs/InP-PIN-photodiode with Preamplifier-IC
l Designed for SONET OC-3 / SDH STM-1 applications
in fiber-optic communication systems
l Hermetically sealed TO46 coaxial package
l MMF-pigtail with different plugs
l Sensitive in both opt. windows (1300 and 1550 nm)
l 3dB-Bandwidth 240 MHz
l Module with high optical sensitivity -36 dBm
l 25 dB dynamic range with 20 kΩ transimpedance
l Differential output with 50 Ω impedance
l Excellent noise immunity due to internal blocking and
filtering capacitors
l SRP 00245x with flange for easy mounting
Maximum Ratings
Optical power ratings refer to the SM fiber input.
Module Symbol Values Unit
Operating temperature range at case TC- 40... +85 °C
Storage temperature range Tstg - 40... +85 °C
Soldering temperature
tmax = 10 s, 2 mm distance from bottom edge of case TS260 °C/min
Maximum Voltage VCC 6V
Optical Overload Pmax 350 µW
RP00244X.DOC page 2 from 3 Juli 2, 1997
Principal function:
4
3
1
4
Postamp
PIN-Preamp Filter
AC-coupling
RT
Characteristics
at TA= 25°C, unless otherwise specified. Optical power data refer to SM fibre as
optical port. Typical values, if not otherwise specified.
Symbol Min. Typ. Max. Unit
Optical Sensitivity (BER≤ 10-9)S -36 dBm
Linear Bandwidth (-3dB) BW 180 240 MHz
Optical overload Pmax 200 350 µW
Transresistance RT81012
kΩ
Noise current density 3 pA/√Hz
Supply Voltage VCC 4.5 5 6 V
Supply Current ICC 25 mA
Gain G 5 8 12 mV/µW
Description
The SRP00244x / SRP00245x is an optical receiver module which uses a high-
speed PIN photodetector coupled with a hybrid low noise transimpedance amplifier
(TIA) for 1300 nm or 1550 nm optical communications. The PIN-Photodiode is made
of InGaAs/InP and has an active diameter of 75 µm.
The function of the PIN-TIA module is to detect input optical power, to transduce the
incident radiation into current and then to convert the current into a voltage and drive
50Ω line.
The low input noise current density of the transimpedance amplifiers provides the
optical receiver module, when used with appropriate filtering, with ample sensitivity
for realizing minimum input power requirements.
RP00244X.DOC page 3 from 3 Juli 2, 1997
Designers of optical receivers can use the module in any application that benefits
from integration of the photodiode and TIA into a TO coaxial package. Typical for
such applications are receivers for digital crossconnects, digital loop carriers,
add/drop-multiplexers and optical network units.
The SRP00244x / SRP00245x is also beneficial because it operates from a single +5
volt supply and is packaged in a compact, hermetically sealed module. In addition,
the SRP00244x / SRP00245x, which has three isolated leads, requires fewer
electrical connections and no additional shielding compared with discrete
implementations of the photodetection/ TIA-function. These features make the
SRP00244x / SRP00245x an excellent optical receiver module of benefit in other
fiber optic receiver applications.
Pinout of the Receiver Module:
(Bottom view)
3
2
1
4
Out
+
V
CC
Out-
Gnd
