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Product Data Sheet
RXM-155
SONET/SDH Fiber-Optic Receiver Module
Features
SONET OC-3 and SDH STM-1 Compatible
PECL Data Outputs
Single +5 Volt Supply
PECL Loss of Signal Flag
Operation at 1300 nm and 1550 nm
-45° to +85°C Operation
-34dBm minimum sensitivity
Wide Dynamic Range
Multi-Sourced 20 Pin DIL Footprint
The RXM-155 SONET/SDH Fiber-Optic Receiver Module
Applications
Telecom Receiver Applications
Medium and Long Haul SONET/SDH @ 155 Mb/s
High Performance Datacom Receiver Applications
ATM @ 155 Mb/s
Description
VI’s RXM-155 is an integrated fiber-optic receiver
module. It is powered by a single +5v power supply and
is housed in a 20 PiN DIL package.It is ideally suited for
SONET OC-3, SDH STM-1 and other 155 Mb/s fiberoptic transmission applications that demand superior
performance. It is available with a multi-mode fiber
pigtail with either FC/PC,ST or SC connector.
Vectron International 166 Glover Avenue Norwalk CT. 06856-5160 Tel: 1-88-VECTRON-1 www.vectron.com
RXM-155 SONET/SDH Receiver Module
Product Data Sheet
Functional Overview
This highly integrated module converts a 155 Mb/s
fiber-optic NRZ signal to differential PECL data outputs.
A PECL flag alerts the user to a loss of signal condition
when the optical input falls below an acceptable level.
A single +5 Volt supply provides bias for the module’s
preamplifier, and Quantizer. The photodiode may be
biased with -5 Volts or Grounded. All elements are
integrated into fiber-coupled 1.3” X 0.635” 20 pin DIL
package. The RXM-155 footprint and pinout are
industry common for ease of integration.
The optical signal is coupled through a short length of
50.0 µm multimode or single mode optical fiber to a
hermetic module which encases an InGaAs PiNphotodiode and preamplifier. The PiN-photodiode
converts the optical signal to an electrical current. The
signal is then converted to a voltage and amplified by a
low noise transimpedance amplifier.
Further gain is provided by the quantizer, which also
provides a Flag output when the optical signal falls
below an acceptable level.
Figure 1. RXM-155 Functional Block Diagram
Vectron International 166 Glover Avenue Norwalk CT. 06856-5160 Tel: 1-88-VECTRON-1 www.vectron.com
2
RXM-155 SONET/SDH Receiver Module
Product Data Sheet
10
Pin 1 Indicator
Top View
11
20
Figure 2. Pin Diagram (Top View)
Table 1. Pin Function
Pin
7 Data PECL Data Output.
9 Data PECL Complementary Data Output.
10 V
11 V
12 Flag Input Signal Level Status. This PECL output switches low when the received
14 Flag Complementary Input Signal Status. PECL complement of Flag.
1,2,3,6,8,13,15,16 GND Ground.
4,5,17,18,19,20 NC No User Connection.
1. By connecting pin 10 to a -5 Volt bias through a series resistor (e.g. 1 kΩ) received optical power can be monitored as a voltage drop across the resistor.
Symbol
D
CC
Function
Detector Anode Bias. Connect to GND or a -5V biased series resistor for
received optical power monitoring.
5 Volt Supply Voltage.
optical power falls below the flag threshold.
1
Absolute Maximum Ratings
Absolute maximum ratings are provided here as
worst case and short duration exposure conditions
only. Exposure to conditions more severe than the
Absolute Maximum Ratings may result in permanent
damage. Exposure to conditions at the Absolute
Table 2. Absolute Maximum Ratings
Parameter Symbol Minimum Maximum Units
Storage Temperature Range T
Supply Voltage V
pin Detector Bias V
Lead Soldering Conditions 250/10 °C/s
Vectron International 166 Glover Avenue Norwalk CT. 06856-5160 Tel: 1-88-VECTRON-1 www.vectron.com
S
CC
D
Maximum Ratings for extended periods may also
adversely affect device performance or reliability.
Functional operation of the device is not implied at
these conditions.
-40 85 °C
0+6V
-15 0 V
3