SRP00294x.doc page 1 from 4 Issue 07.05.1998
Optical Receiver Module SRP00294x
(Photodiode with Preamplifier) SRP00295x
• InGaAs/InP-PIN-photodiode with Preamplifier-IC
• Designed for SONET OC-48 / SDH STM-16
applications in fiber-optic communication systems
• Hermetically sealed 4-pin TO46 coaxial package
• MMF-pigtail with different connectors
• Sensitive in both opt. windows (1310 and 1550 nm)
• 3dB-Bandwidth 1600 MHz
• Module with high optical sensitivity -22 dBm
• High dynamic range ( > 20 dB )
• 28,8 kΩ transimpedance (differential)
• Differential output with 60 Ω impedance
• Excellent noise immunity
• SRP00295x with flange for easy mounting
Maximum Ratings
Optical power ratings refer to the SM fiber input.
Parameter Symbol Values Unit
Operating temperature range at case Tc- 40... +85 °C
Storage temperature range Tstg - 40... +85 °C
Soldering temperature Tmax for 10s, 2 mm
distance from bottom edge of case Tmax 260 °C
Maximum voltage Vcc 6V
Maximum optical power (average) Pmax 1000 µW
SRP00294x.doc page 2 from 4 Issue 07.05.98
Principal function:
2
4
1
3
+
-
Characteristics
at Vcc= 5,0V @ TA= 25°C, unless otherwise specified. Optical power data refer to SM
fibre as optical port. Typical values, if not otherwise specified.
DC-Characteristics Symbol Min. Typ. Max. Unit
Supply Voltage VCC 4,5 5 5,5 V
Supply Current ICC 47 mA
AC-Characteristics Symbol Min. Typ. Max. Unit
Optical Sensitivity (BER≤ 10-9)S -22 dBm
Linear Ban dwidth (-3dB) B W 1600 MHz
Low frequency cutoff fcutoff 65 kHz
Optical overload Pmax 900 µW
Transresistance, differential RT28,8 kΩ
Output resistance, differential Rout 50 60 70 Ω
Gain, differential G 23 mV/µW
Optical Return Loss RL -27 dB
SRP00294x.doc page 3 from 4 Issue 07.05.98
Description
The SRP00294x / SRP00295x is an optical receiver module which uses a high-speed
PIN-photodetector coupled with a hybrid low noise transimpedance amplifier (TIA) for
1310 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.
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 SRP00294x / SRP00295x is also beneficial because it operates from a single +5
volt supply and is packaged in a compact, hermetically sealed module. In addition,
the SRP00294x / SRP00295x, 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
SRP00294x / SRP00295x an excellent optical receiver module of benefit in other
fiber optic receiver applications.
Application
The outputs Out+ and Out - can be (AC-coupled!)
loaded with 50 Ohm.
Both outputs have to be terminated with the same
load.
At small optical input power (< 10µW) the
photocurrent produced in the photodiode can be
directly measured between Vcc and Gnd without
applying any voltage at Vcc. (At higher optical input
power the photocurrent is not proportional to the
optical input power.)
Pinout (bottom view)
3
2
1
4
Out+
V
CC
Out-
Gnd
SRP00294x.doc page 4 from 4 Issue 07.05.98
Some eye diagrams
Popt= 5 µW avg. (OC-48/STM-16) P opt= 10 µW avg. (OC- 48/STM - 1 6)
Popt= 100 µW avg. (OC-48/STM-16) Popt= 500 µW avg. (OC-48/STM-16)
