High Sensitivity OC-3/STM-1 APD
Receivers
SRX03-APD
Product Description
The SRX03-APD is a high sensitivity receiver module designed to ex-
ceed the SONET/SDH optical interface requirements at OC-3/STM-1
(156Mb/s) data rate. Highly reliable InGaAs/InP avalanche photodiode
(APD) is used to cover the entire long wavelength range from 1100nm
to 1600nm.
The receivers feature a low noise GaAs transimpedance IC with AGC ca-
pability to provide an extremely wide dynamic range and high sensitiv-
ity. The APD bias voltage is temperature compensated to ensure stable
operation over the entire operating temperature range. A signal detect
function which indicates loss of optical input is provided. A differential
optical power monitor output is also available.
The SRX03-APD receivers require only a single +5V supply. The data in-
terfaces are differential PECL. The signal detect outputs can be either
PECL or TTL interface.
The SRX03-APD receivers can operate over an operating case temper-
ature range of 0°C to +70°C or -40°C to +85°C. The module is 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.
Related OC-3/STM-1 transmitters & receivers
STX-03: 20-pin laser transmitter
SRX-03: 20-pin receiver without clock recovery (PECL SIGNAL DETECT)
SRC-03: 20-pin receiver with clock recovery (TTL SIGNAL DETECT)
SRC-03-S: 24-pin receiver with clock recovery (ECL/PECL SIGNAL DE-
TECT)
Features
Exceeds SONET/SDH OC-03/STM-1 Long Reach
Specifications
Optical Power Monitor Outputs
- 40°C to +85°C Operating Temperature Option
24-pin DIP Metal Package
ST, FC or SC-connectorized Fiber Pigtail
Differential PECL Data Outputs
Differential PECL or TTL Signal Detect Output
Option
Single +5 V Power Supply
Absolute Maximum Ratings
Parameter
Storage Temperature
Operating Case Temperature
Operating & Storage Humidity
Supply Voltage
Maximum Input Optical Power
Lead Soldering Temperature & Time
“H” option
“I” option
Symbol
T
ST
T
OP
-
V
CC
P
in, max
-
Minimum
- 40
0
- 40
-
0
-
-
Maximum
+ 85
+ 70
+ 85
85
+ 6.0
- 5.0
260°C, 10 sec
Units
°C
°C
%
V
dBm
R4.2008.04.30
Oplink Communications, Inc.
SRX03-APD
Receiver Performance Characteristics
(Over Operating Case Temperature, V
CC
= 4.75 to 5.25V)
All parameters guaranteed only at typical data rate
Parameter
Operating Data Rate
1
Receiver Sensitivity
(10
-10
BER)
2
Temperature Option “I”
Temperature Option “H”
Increasing Light Input
Decreasing Light Input
Symbol
B
P
min
P
max
P
sd+
P
sd-
-
λ
V
PM
Minimum
-
- 41.0
- 42.0
- 8.0
-
- 55.0
-
1100
-
Typical
156
- 43.0
- 44.0
- 3.0
-
-
0.5
-
30
Maximum
-
-
-
-
- 42.0
-
-
1600
-
Units
Mb/s
dBm
dBm
dBm
dB
nm
mV/µW
Maximum Input Optical Power (10
-10
BER)
2
Signal Detect Thresholds
Signal Detect Hysteresis
Wavelength of Operation
Optical Power Monitor Differential Voltage (at 25°C)
1
2
Data rate ranges from 10Mb/s to 200Mb/s. However, some degradation may be incurred in overall performance.
Specified in average optical input power and measured at 1310nm wavelength with 2
23
-1 PRBS at 156Mb/s.
Receiver Electrical Interface
(Over Operating Case Temperature, V
CC
= 4.75 to 5.25V)
Parameter
Supply Voltage
Supply Current
DATA Output HIGH Voltage
1
DATA Output LOW Voltage
1
SIGNAL DETECT HIGH Voltage (PECL option)
1
SIGNAL DETECT LOW Voltage (PECL option)
1
SIGNAL DETECT HIGH Voltage (TTL option)
SIGNAL DETECT LOW Voltage (TTL option)
V
PD
Output Voltage (maximum current 3mA)
1
Symbol
V
CC
I
CC
V
OH
V
OL
V
OH
V
OL
V
OH
V
OL
V
PD
Minimum
4.75
-
V
CC
- 1.150
V
CC
- 1.830
V
CC
- 1.150
V
CC
- 1.830
2.7
0
- 90
Typical
5.0
120
-
-
-
-
-
-
- 60
Maximum
5.25
180
V
CC
- 0.880
V
CC
- 1.555
V
CC
- 0.880
V
CC
- 1.555
V
CC
0.5
- 20
Units
V
mA
V
V
V
V
V
V
V
With termination of 50Ω to
V
CC
- 2V.
Interface Circuit
1
µ
H coil or
ferrite inductor
10
0.01
+5V
0.01
10
Pin Assignments (Top View)
CASE
N/C
V
PD
OUT
SIGNAL
DETECT+
SIGNAL
DETECT-
7,18,20
16
510 (Note 1)
17
510 (Note 1)
8
82
82
DATA+
GND
V
PM+
V
PM-
V
CC
DATA+
DATA-
N/C
GND
SRX
9
4,11,12,13
14,15,19
130
DATA -
VPD
OUTPUT
3
1,24
130
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
CASE
N/C
N/C
N/C
V
CC
GND
V
CC
SIGNAL DETECT -
SIGNAL DETECT +
GND
GND
GND
Note 1: This resistor is for the PECL option only. It should be omitted for TTL option.
Note 2: Resistor values are in Ω, capacitor values are in
µ
F.
N/C: No internal
connection
All CASE pins should be grounded
Oplink Communications, Inc.
2
R4.2008.04.30
SRX03-APD
Application Notes
The receiver converts the incident optical power to
a photocurrent via a high performance avalanche
photodiode (APD). The photocurrent can be monitored
via the differential voltage across the two VPM+ and
VPM- output pins. It is important to note that the
common mode voltage (i.e. DC voltages at PM+ and
VPM-) is high (-60V typical). The APD bias voltage is
temperature compensated to ensure stable operation
over the entire operating temperature range. The APD
bias voltage is also available as an output via the VPD
output. The maximum current that this output can
source is 1mA.
The signal detect circuit monitors the level of the
incoming optical signal and generates a logic LOW signal
when an insufficient photocurrent is produced.
Both differential DATA+ and DATA- outputs (also
SIGNAL DETECT+ and SIGNAL DETECT- if the PECL
option is chosen) are open emitter PECL levels
requiring termination (50Ω to VCC - 2V or 510Ω to
GND is recommended). Both differential outputs
should be terminated in the same manner, even if
only one is used.
If the TTL option is chosen for the SIGNAL DETECT
outputs, no termination resistor should be used.
The power supply line should be wellfiltered. The
power supply should be bypassed by 0.01 or 0.1μF
ceramic chip placed as close to the receiver module
as possible.
APD Bias
Supply
220Ω
10kΩ
VPD
OUT
VPM-
10kΩ
VPM+
APD
Package Outline
46335 Landing Parkway Fremont, CA 94538-6407 Tel: (510) 933-7200 Fax: (510) 933-7300 Email: Sales@Oplink.com
Dimensions in inches [mm]
Default tolerances:
.xxx =
±
.005”, .xx =
±
.01”
The pigtail length from the
package edge is 1.0 meter typical.
Related Transmitter & Receiver Modules
STX-03: OC-3/STM-1 Transmitter (multi-sourced 20-pin DIP)
SRX-03: OC-3/STM-1 Receiver without Clock Recovery, ECL SIGNAL DETECT (multi-sourced 20-pin DIP)
SRC-03: OC-3/STM-1 Receiver with Clock Recovery (multi-sourced 20-pin DIP)
SRC-03-S: OC-3/STM-1 Receiver with Clock Recovery (24-pin DIP, compatible with Sumitomo SDT8701-RD)
Ordering Information
SRX
8
0
3
X
R
2
0
0
0
Supply Voltage
RX only 5V= 8
Receivers
Wavelength Range
1100~1600nm APD
Temperature Range
-40 ~85˚C= I
0~70˚C= H
Connector Type &
Option
Pigtail FC, SD-TTL= PA
Pigtail ST, SD-TTL= PB
Pigtail SC, SD-TTL= P5
Pigtail FC, SD-PECL= PC
Pigtail ST, SD-PECL= PD
Pigtail SC, SD-PECL= P4
Oplink Communications, Inc. reserves the right to make changes in equipment design or specifications without notice. Information supplied by Oplink Commu-
nications, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Oplink Communications, Inc. for its use nor for any infringements
of third parties, which may result from its use. No license is granted by implication or otherwise under any patent right of Oplink Communications, Inc.
R4. 2008.04.30
© 2008, Oplink Communications, Inc.
3
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