OC-48/STM-16 Receiver with Clock
Recovery
SRC48
Product Description
The SRC48 modules are receivers with internal clock recovery 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 avail-
able which are fully compliant with Short Reach, Intermediate Reach
and Long Reach specifications at 1300 nm and 1550 nm wavelength.
The receiver for the Short Reach and Intermediate Reach version uses
PIN photodiodes. For the Long Reach version, InGaAs avalanche photo-
diodes (APDs) are used to achieve high sensitivity. The Long Reach re-
ceiver features a low noise GaAs transimpedance IC with AGC capability
to provide an extremely wide dynamic range. A Phase Lock Loop (PLL)
circuit is included to perform the clock recovery function and resam-
pling of the data. Both DATA and CLOCK outputs are differential signals
designed to be AC-coupled into 50 ohm load. A TTL Signal Detect func-
tion which indicates loss of optical input and an analog Received Opti-
cal Power Monitor output ares also provided.
All receiver modules can be operated with a single +5V supply. The op-
erating 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 ver-
sion. All receivers are housed in a 24-pin dual-in-line metal package
with fiber pigtail (single mode fiber for Long Reach version and 50/125
μm multimode fiber for Short Reach and Intermediate Reach versions).
The fiber pigtail is terminated with ST, FC or SC connector.
Features
Fully compliant with SONET/SDH OC-48/STM-16
(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
FC, ST, SC-connectorized fiber pigtails
Differential DATA & CLOCK interface
TTL SIGNAL DETECT output
Received Optical Power Monitor function
Single +5 V supply
Absolute Maximum Ratings
Parameter
Storage Temperature
Operating Case Temperature
“I” option (“SR” & “IR” only)
“H” option
Symbol
T
ST
T
OP
P
in, max
V
CC
V
IN
-
Minimum
- 40
- 40
0
-
0
0
-
Maximum
+ 85
+ 85
+ 70
- 5.0
+ 6.0
V
CC
260°C, 10 sec
Units
°C
°C
dBm
V
V
Maximum Optical Input Power (“LR” only)
Supply Voltage
Input Voltage
Lead Soldering Temperature & Time
An Oplink Company
R3.2009.04.30
SRC48
Receiver Performance Characteristics
Parameter
Data Rate
Receiver Sensitivity
(10
-10
BER)
1
Maximum Input Optical
Power (10
-10
BER)
1
Short & Intermediate Reach
Long Reach
Short Reach (SR)
Intermediate Reach (IR)
Long Reach (LR)
SR & IR
Signal Detect Thresholds
LR
Signal Detect Hysteresis
Optical Power
Monitor Current
Wavelength of Operation
Clock Sampling Point
Output Clock Jitter
Jitter Tolerance & Transfer Function
1
(Over Operating Case Temperature.)
Symbol
B
P
min
Minimum
2.48832
- 500 ppm
- 20.0
- 28.0
- 3.0
P
max
P
sd+
P
sd-
P
sd+
P
sd-
-
0
- 8.0
-
- 35.0
-
- 42.0
0.5
-
-
1100
150
-
Typical
2.48832
- 24.0
- 31.0
- 1.0
2.0
-
-
-
-
-
1.0
6
0.8
-
200
-
Maximum
2.48832
+ 500 ppm
-
-
-
-
- 6.0
- 20.0
-
- 28.0
-
-
-
-
1600
250
0.01
dBm
dBm
dB
µA/µW
nm
ps
UIrms
dBm
Units
Gb/s
dBm
Increasing Light Input
Decreasing Light Input
Increasing Light Input
Decreasing Light Input
LR (P
in
from -28 dBm to -17 dBm)
IR & SR (P
in
from -20 dBm to 0 dBm)
I
PM
λ
T
CSP
CLK
J
compliant with ITU Recommendation G.958
Specified in Average Optical Input Power and measured at 2.48832 Gb/s and 1300 nm or 1550 nm wavelength with 2
23
-1 PRBS.
Receiver Electrical Interface
Parameter
Supply Voltage
Supply Current
Output Voltage Swing
1
Symbol
V
CCA’
V
CCD
Minimum
4.75
-
-
0.4
0.35
2.7
0
Typical
5.0
425
465
0.75
0.45
-
-
Maximum
5.25
525
565
0.95
0.95
V
CCD
0.50
Units
V
mA
V
V
V
SR & IR
LR
DATA
CLOCK
I
V
PP
V
OH
V
OL
Output HIGH Voltage (SIGNAL DETECT)
Output LOW Voltage (SIGNAL DETECT)
1
AC-coupled into 50 ohm load
Interface Circuit
+5V
1 µH coil or ferrite bead
(<0.1 ohm series resistance)
+
10
+
100
0.01
50 ohm line
6
23,24
13,14
15,16
5
0.022
0.022
DATA+
to 50 ohm load
DATA-
to 50 ohm load
CLK+
to 50 ohm load
CLK-
to 50 ohm load
50 ohm line
+
100
0.01
50 ohm line
10
0.001
NO CONNECTION
3 Kohm
+
10
0.01
1
SRC-48
9
50 ohm line
0.001
+5V
3
2,4,7,8,11,12
17,18,19,20
21
22
SD+
SD -
Oplink Communications, Inc.
2
R3.2009.04.30
SRC48
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). The photocurrent can be monitored via
the voltage drop across an external resistor connected between
PM
and
V
CC
. The APD Bias Voltage is internally generated from
the +5 V supply by a low noise DC-DC converter. The APD
Bias Voltage is temperature compensated to ensure stable
operation over the entire operating temperature range.the
Optical Power Monitor Interface Circuit
VCC
entire operating temperature range.
Both DATA and CLOCK 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 logic LOW signal at the SIGNAL DETECT+ output
when insufficient photocurrent is produced. No termination
resistor is required for the SIGNAL DETECT outputs.
Timing Diagram
External
Monitor Resistor
(about 3 Kohm)
PM
(Pin 3)
DATA
T
CSP
APD/PIN
Current
Monitor
CLOCK
SRC-48
Typical Jitter Transfer Function
Typical DATA output Eye Pattern
Typical Jitter Tolerance Measurement
Oplink Communications, Inc.
3
R3.2009.04.30
SRC48
Package Outline
(Dimension in inches)
The pigtail length from the package
edge is 1.0 meter typical.
46335 Landing Pkwy Fremont, CA 94538 Tel: (510) 933-7200 Fax: (510) 933-7300 Email: Sales@Oplink.com • www.oplink.com
Pinout Assignments
PIN
1
2
3
4
5
6
7
8
9
10
11
12
GND
PM (optical Power Monitor)
GND
DATA OUTPUT -
DATA OUTPUT +
GND
GND
CLK - (CLOCK OUTPUT -)
CLK - (CLOCK OUTPUT +)
GND
GND
FUNCTION
N/C (NO CONNECTION)
PIN
24
23
22
21
20
19
18
17
16
15
14
13
FUNCTION
V
CCA
(V
CC
ANALOG)
V
CCA
(V
CC
ANALOG)
SD - (SIGNAL DETECT -)
SD + (SIGNAL DETECT +)
GND
GND
GND
GND
V
CCD
(V
CC
DIGITAL)
V
CCD
(V
CC
DIGITAL)
V
CCD
(V
CC
DIGITAL)
V
CCD
(V
CC
DIGITAL)
Related TX, RX &
Transceiver Modules
STX-48:
OC-48/STM-16 Transmitter (24-pin DIP)
SRX-48:
OC-48/STM-16 Receiver without Clock
Recovery (24-pin DIP)
DTR-2488-SM:
OC-48/STM-16 Transceiver without
Clock Recovery (industry standard 1x9 package)
DTR-2488-SM2:
OC-48/STM-16 Transceiver without
Clock Recovery (industry standard 2x9 package)
DTC-48:
OC-48/STM-16 Transceiver with Clock
Recovery (industry standard 2x9 package)
Ordering Information
SRC
8
4
8
X
0
0
0
Supply Voltage
5V= 8
Receivers
Wavelength
1100~1600nm PIN= R1
1100~1600nm APD= R2
Temperature Range
-40 ~85˚C= I
0~70˚C= H
Option
Pigtail FC= P1
Pigtail ST= P2
Pigtail SC= P3
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.
R3.2009.04.30
© 2008, Oplink Communications, Inc.
4
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