OC-12/STM-4 Receiver with
Clock Recovery
SRC12 Series
Product Description
The SRC12 is a Receiver Module with internal clock recovery designed to
meet or exceed the SONET/SDH optical interface requirements at OC-12/
STM-4 (622 Mb/s) data rate. Highly reliable InGaAs/InP PIN photodiodes
are used to cover the entire long wavelength range from 1100 nm to 1550
nm.
The receiver features a low noise GaAs transimpedance IC with AGC ca-
pability to provide an extremely wide dynamic range and high sensitivity.
A Phase Lock Loop (PLL) circuit is included to perform the clock recovery
function and resampling of the data.
The SRC12 receiver requires a single +5 V supply. The DATA & CLOCKinter-
face signals are differential PECL while the SIGNAL DETECT outputs have
TTL interface.
The SRC12 module can operate over an operating temperature range of
0°C to +70°C (“H” option) or -40°C to +85°C (“I” option). It is housed in a
20-pin dual-in-line metal package with integral ST, FC or SC connector
receptacle or fiber pigtail (50 µm multimode fiber). The fiber pigtail is ter-
minated with ST, FC or SC connector.
Features
Full compliance with SONET/SDH OC-12/
STM-4 specifications
Long Reach and Intermediate Reach
Phase-Lock-Loop (PLL) Clock Recovery
- 40°C to +85°C Operating Temperature (“I”
option)
Multi-sourced 20-pin DIP metal package
FC, ST, SC-connectorized fiber pigtails or
Integral FC, SC or ST connector receptacle
PECL DATA & CLOCK interface
TTL SIGNAL DETECT interface
Related OC-12/STM-4 transmitters & receivers
STX-12: 20-pin laser transmitter
SRX-12: 20-pin receiver without clock recovery (PECL SIGNAL DETECT)
SRX-12-L: 20-pin receiver without clock recovery (TTL SIGNAL DETECT)
SRC-12-S: 24-pin receiver with clock recovery
Absolute Maximum Ratings
Parameter
Storage Temperature
Operating Temperature
Operating & Storage Humidity
Supply Voltage
Lead Soldering Temperature & Time
“I” option
“H” option
Symbol
T
ST
T
OP
-
V
CC
-
Minimum
- 40
- 40
0
-
0
-
Maximum
+ 85
+ 85
+ 70
85
+ 6.0
260°C, 10 sec
Units
°C
°C
%
V
R5.2008.06.04
Oplink Communications, Inc.
SRC12 Series
Receiver Electrical Interface
(Over Operating Case Temperature)
Parameter
Supply Voltage
Supply Current
Output HIGH Voltage (DATA & CLOCK)
1
Output LOW Voltage (DATA & CLOCK)
1
Output HIGH Voltage (SIGNAL DETECT)
Output LOW Voltage (SIGNAL DETECT)
1
Symbol
V
CC
I
CC
V
OH
V
OL
V
OH
V
OL
Minimum
4.75
-
V
CC
- 1.11
V
CC
- 2.00
2.7
0
Typical
5.0
160
-
-
-
-
Maximum
5.25
210
V
CC
- 0.67
V
CC
- 1.50
V
CC
0.5
Units
V
mA
V
V
V
V
With termination of 50 ohm to
V
CC
- 2V.
Receiver Performance Characteristics
(Over Operating Case Temperature)
Parameter
Data Rate
Receiver Sensitivity (10
-10
BER)
1
Maximum Input Optical Power (10
-10
BER)
1
Signal Detect Thresholds
Signal Detect Hysteresis
Wavelength of Operation
Output Clock Jitter
Jitter Tolerance & Transfer Function
1
Symbol
B
P
min
P
max
P
sd+
P
sd-
λ
CLK
J
Minimum
622.08 - 200ppm
- 28.0
- 7.0
-
- 40.0
-
1100
-
Typical
622.08
- 30.0
0
-
-
0.5
-
-
Maximum
622.08 + 200ppm
-
-
- 28.0
-
-
1600
0.01
Units
Mb/s
dBm
dBm
dBm
dBm
dB
nm
UIrms
Increasing Light Input
Decreasing Light Input
compliant with ITU Recommendation G.958
Specified in Average Optical Input Power with single mode fiber and measured at 1300 nm wavelength with 2
23
-1 PRBS.
Interface Circuit
1 µH coil or
ferrite inductor
10
0.01
+
+5 volt
10
0.1
11
SIGNAL
DETECT+
(TTL LEVELS)
12
82
82
82
82
SRC-12
14
7
9
4
5
DATA+
DATA -
CLOCK+
CLOCK -
(PECL LEVELS)
(PECL LEVELS)
SIGNAL
DETECT -
1, 13, 20
6, 8, 15
130
130
130
130
RESISTOR VALUES ARE IN OHM, CAPACITOR VALUES ARE IN µF UNLESS OTHERWISE INDICATED
Oplink Communications, Inc.
2
R5.2008.06.04
SRC12 Series
Application Notes
Receiver Circuit:
The receiver converts the incident optical power to a
photocurrent via a high performance PIN photodiode. The photocurrent
is converted to a voltage signal by a transimpedance amplifier. This
signal is then amplified by additional gain stages and processed through
a shaping filter and a comparator to generate the data to the clock
recovery circuit. The clock recovery circuit uses a Phase Lock Loop (PLL) to
recover the clock from the data and resamples the data to generate clean
and reshaped differential DATAoutputs. Also provided are differential
recovered CLOCK outputs.
Both differential DATA+ and DATA- as well as CLOCK+ and CLOCK- outputs
are open emitter PECL levels requiring termination (50 ohms to
V
CC
- 2
volts or 510 ohms to
GND
is recommended). For optimum performance,
both outputs should be terminated in the same manner, even if only
one is used.
The Signal Detect circuit monitors the level of the incoming optical signal
and generates a logic LOW (TTL) signal when insufficient photocurrent
is produced. When this happens, the CLOCK+ and CLOCK- outputs are
locked to an internal reference frequency of 622.08 ± 0.2 MHz, the DATA+
output is held at logic HIGH and the DATA- output is held at logic LOW.
Interface Circuit:
The power supply line should be wellfiltered. The
power supply should be bypassed by 0.01 or 0.1 µF ceramic chip
capacitors placed as close to the receiver module as possible. If the
receiver outputs drive long traces or multiple loads, the use of an ECL
buffer gate to isolate the receiver from transmission line reflections is
recommended.
Pin Assignments (Top View)
DATA & CLOCK Timing Diagram
CASE
N/C
N/C
CLOCK +
CLOCK -
GND
DATA+
GND
DATA -
N/C
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CASE
N/C
N/C
N/C
N/C
GND
SIGNAL DETECT -
CASE
SIGNAL DETECT+
V
CC
(+5 V)
Set-up
450 ps typical
Hold
450 ps typical
DATA
CLOCK
N/C: No internal connection
All CASE pins should be grounded
Pigtail Package
The pigtail length from the package edge is
1.0 meter minimum, 1.1 meter typical.
Dimension in inches
Oplink Communications, Inc.
3
R5.2008.06.04
SRC12 Series
SC-receptacled Package
Dimension in inches
FC-receptacled Package
46335 Landing Parkway Fremont, CA 94538-6407 Tel: (510) 933-7200 Fax: (510) 933-7300 Email: Sales@Oplink.com
Dimension in inches
ST Receptacle Package
Dimension in inches
Ordering Information
SRC
8
1
2
X
R
1
0
0
0
Supply Voltage
RX only 5V= 8
Receivers
Wavelength Range
1100~1600nm PIN
Temperature Range
-40 ~85˚C= I
0~70˚C= H
Connector Type & Option
Pigtail FC= P1
Pigtail ST= P2
Pigtail SC= P3
ST Connector= C1
FC Connector= C2
SC Connector= C3
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.
R5.2008.06.04
© 2008, Oplink Communications, Inc.
4
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