SRX48-SR1

OC-48/STM-16 Receiver without Clock
Recovery
SRX48 Seris
Product Description
The SRX48 modules are receivers designed to meet or exceed the SONET/SDH optical interface requirements at OC-48/STM-16 (2.488 Gb/s)
data rate. Three performance versions are available which are fully compliant with Short Reach, Intermediate Reach and Long Reach specifications at 1300 nm or 1550 nm wavelength.
The receiver for the Short Reach and Intermediate Reach version uses
PIN photodiodes. For the Long Reach version, InGaAs avalanche photodiodes (APDs) are used to achieve high sensitivity. The Long Reach
receiver features a low noise GaAs transimpedance IC with AGC capability to provide an extremely wide dynamic range. The DATA outputs
are differential signals designed to be AC-coupled into 50 ohm load. A
TTL Signal Detect function which indicates loss of optical input and an
analog Received Optical Power Monitor output are also provided.
All receiver modules can be operated with a single +5V supply. The operating temperature range is -40°C to +85°C for the Short Reach and Intermediate Reach version and 0°C to +70°C for the Long Reach version.
All receivers are housed in a 24-pin dual-in-line metal package with a
fiber pigtail (single mode fiber for Long Reach version and 50/125 μm
multimode fiber for Short Reach and Intermediate Reach versions),
which is terminated with MU, LC, ST, FC or SC connector.
Features
 Fully compliant with SONET/SDH OC-48 (2.5
Gb/s) specifications
 Long Reach 1310 nm & 1550 nm as well as
Intermediate Reach and Short Reach
 Internal temperature-compensated High
Voltage APD Supply (Long Reach version)
 -40°C to +85°C Operating Temperature
(Intermediate Reach and Short Reach)
 24-pin DIP metal package
 MU, LC, FC, ST, SC-connectorized fiber pigtails
 Differential DATA interface
 Received Optical Power Monitor function
 TTL SIGNAL DETECT output
 Single +5 V supply
Absolute Maximum Ratings
Parameter
Symbol
Minimum
Maximum
Units
TST
- 40
+ 85
°C
- 40
+ 85
0
+ 70
Pin, max
-
- 5.0
dBm
Supply Voltage
VCC
0
+ 6.0
V
Input Voltage
VIN
0
VCC
V
-
-
Storage Temperature
Operating Case Temperature
“I” option (“SR” & “IR” only)
“H” option
Maximum Optical Input Power (“LR” only)
Lead Soldering Temperature & Time
An Oplink Company
TOP
°C
260°C, 10 sec
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SRX48
Receiver Performance Characteristics
(Over Operating Case Temperature.)
Parameter
Symbol
Minimum
Typical
Maximum
Units
B
0.1
2.488
3.0
Gb/s
- 20.0
- 24.0
-
- 28.0
- 32.0
-
- 3.0
- 1.0
-
0
2.0
-
- 8.0
-
- 6.0
Data Rate
Short & Intermediate Reach
Receiver Sensitivity
(10-10 BER) 1
Pmin
Long Reach
Maximum Input Optical
Power (10-10 BER) 1
Short Reach (SR)
Pmax
Intermediate Reach (IR)
Long Reach (LR)
Psd+
-
-
- 20.0
Decreasing Light Input
Psd-
- 35.0
-
-
Increasing Light Input
Psd+
-
-
- 28.0
Decreasing Light Input
Psd-
- 42.0
-
-
-
0.5
1.0
-
dB
LR (Pin from -28 dBm to -17 dBm)
VPM
-
6.4
-
mV/µW
IR & SR (Pin from -20 dBm to 0 dBm)
IPM
-
0.8
-
µA/µW
λ
1100
-
1600
nm
Signal Detect Thresholds
LR
Signal Detect Hysteresis
Wavelength of Operation
1
dBm
Increasing Light Input
SR & IR
Optical Power
Monitor
dBm
dBm
dBm
Specified in Average Optical Input Power and measured at 2.48832 Gb/s and 1300 nm or 1550 nm wavelength with 2 -1 PRBS.
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Receiver Electrical Interface
Parameter
Supply Voltage
Supply Current
SR & IR
Symbol
Minimum
Typical
Maximum
Units
VCCA’ VCCD
4.75
5.0
5.25
V
-
195
250
-
225
275
I
LR
mA
Output Voltage Swing (DATA)
VPP
0.4
0.5
1.0
V
Output HIGH Voltage (SIGNAL DETECT)
VOH
2.7
-
VCC
V
Output LOW Voltage (SIGNAL DETECT)
VOL
0
-
0.7
V
Related OC-48/STM-16 Transceiver & Receiver Modules
STX-48 SRC-48 DTR-2488-SM DTR-2488-SM2
DTC-48 Oplink Communications, Inc.
: Transmitter Module (24-pin DIP)
: Receiver Module with Clock Recovery (24-pin DIP)
: Transceiver without Clock Recovery (industry standard 1x9 package)
: Transceiver without Clock Recovery (industry standard 2x9 package)
: Transceiver with Clock Recovery (industry standard 2x9 package)
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SRX48
Application Notes
The receiver converts the incident optical power to a
photocurrent via a high performance P-I-N photodiode (Short
and Intermediate Reach version) or an avalanche photodiode
(Long Reach version). For the Short and Intermediate Reach
version, the photocurrent can be monitored via the voltage
drop across an external resistor connected between PM+
and VCC. For the Long Reach version, the photocurrent can
be monitored via the differential voltage across the two PM+
and PM- output pins. It is important to note that the Common
Mode voltage of these two monitor outputs (i.e. DC voltages
at PM+ and PM-) is high (- 60 V typical). The APD Bias Voltage
is temperature compensated to ensure stable operation over
the entire operating temperature range.
The DATA outputs are differential signals designed to
be AC-coupled into 50 ohm load. Transmission lines are
recommended for best performance.
The Signal Detect circuit monitors the level of the incoming
optical signal and generates a TTL logic LOW signal at the
SIGNAL DETECT output when insufficient photocurrent is
produced. No termination resistor is required for the SIGNAL
DETECT output.
VCC
External
Monitor Resistor
(3 Kohm recommended)
PM+
APD
1 KΩ
10 KΩ
PM+
10 KΩ
PM-
PD
PD Current
Monitor
APD Bias
Supply
SRX-48
SHORT & INTERMEDIATE REACH
LONG REACH
Interface Circuit
The AC coupling capacitor is typically
0.022 µF for 2.48 Gb/s. If operation at
lower data rates is required, a parrallel
combination of 0.022 µF &
0.22 µF (or larger) is recommended
1 µH coil or ferrite bead
(<0.2 ohm series resistance)
+5V
+
10
+
100
+
10
0.01
PM-
10
17,18
50 ohm line
0.01
9
SRX-48
for LR only
SRX-48
22
8
20
3
DATA+
to 50 ohm load
50 ohm line
DATAto 50 ohm load
for SR & IR only
+5V
+
10
0.01
SIGNAL DETECT
4,5,6,7,11,12,13
14,15,16,19,21
Oplink Communications, Inc.
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R5.2008.04.30
SRX48
Package Outline
(Dimension in inches)
46335 Landing Pkwy Fremont, CA 94538 Tel: (510) 933-7200 Fax: (510) 933-7300 Email: [email protected] • www.oplink.com
The pigtail length from the package
edge is 1.0 meter typical.
Pinout Assignments
PIN
FUNCTION
PIN
FUNCTION
1
N/C (NO CONNECTION)
24
N/C (NO CONNECTION)
2
N/C (NO CONNECTION)
23
N/C (NO CONNECTION)
3
SD (SIGNAL DETECT)
22
PM- (for LR), N/C (for SR & IR)
4
GND
21
GND
5
GND
20
PM+
6
GND
19
GND
7
GND
18
VCCA (VCC ANALOG)
8
DATA OUTPUT -
17
VCCA (VCC ANALOG)
9
DATA OUTPUT +
16
GND
10
VCCD (VCC DC-DC converter)
15
GND
11
GND
14
GND
12
GND (DC-DC converter)
13
GND
Ordering Information
SRX
8
Supply Voltage
4
8
X
0
Receivers
5V= 8
Wavelength
1100~1600nm PIN= R1
1100~1600nm APD= R2
0
0
Temperature Range
Option
-40 ~85˚C= I
0~70˚C= H
Pigtail FC= P1
Pigtail ST= P2
Pigtail SC= P3
Pigtail MU= P6
Pigtail LC= P9
Oplink Communications, Inc. reserves the right to make changes in equipment design or specifications without notice. Information supplied by Oplink Communications, 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.
R5. 2008.04.30
© 2008, Oplink Communications, Inc.
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