1310nm DFB laser and PIN photo detector for 40km transmission
Compliant with SFP MSA and SFF-8472 with duplex LC receptacle
Digital Diagnostic Monitoring:
Internal Calibration or External Calibration
Compatible with SONET OC-24-LR
Compatible with RoHS
l +3.3V single power supply
Operating case temperature: Standard : 0 to +70°C Industrial : -40 to +85°C
Applications
Gigabit Ethernet
Fiber Channel
Switch to Switch interface
Switched backplane applications
Router/Server interface
Other optical transmission systems
Description
The SFP transceivers are high performance, cost effective modules supporting dual data-rate of 1.25Gbps/1.0625Gbps and 40km transmission distance with SMF.
The transceiver consists of three sections: a DFB laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.
Absolute Maximum Ratings
Table 1 – Absolute Maximum Ratings
Parameter
Symbol
Min
Max
Unit
Supply Voltage
Vcc
-0.5
4.5
V
Storage Temperature
Ts
-40
+85
°C
Operating Humidity
–
5
85
%
Recommended Operating Conditions
Table 2 – Recommended Operating Conditions
Parameter
Symbol
Min
Typical
Max
Unit
Operating Case Temperature
Standard
Tc
0
+70
°C
Industrial
-40
+85
°C
Power Supply Voltage
Vcc
3.13
3.3
3.47
V
Power Supply Current
Icc
300
mA
Data Rate
1.25
Gbps
Optical and Electrical Characteristics
GOCS-1312-40 : (DFB and PIN, 1310nm, 40km Reach)
Table 3 – Optical and Electrical Characteristics
Parameter
Symbol
Min
Typical
Max
Unit
Notes
Transmitter
Centre Wavelength
λc
1260
1310
1360
nm
Spectral Width (-20dB)
∆λ
1
nm
Side Mode Suppression Ratio
SMSR
30
dB
Average Output Power
Pout
-5
2
dBm
1
Extinction Ratio
ER
9
dB
Optical Rise/Fall Time (20%~80%)
tr/tf
0.26
ns
Data Input Swing Differential
VIN
400
1800
mV
2
Input Differential Impedance
ZIN
90
100
110
Ω
TX Disable
Disable
2.0
Vcc
V
Enable
0
0.8
V
TX Fault
Fault
2.0
Vcc
V
Normal
0
0.8
V
Receiver
Centre Wavelength
λc
1260
1360
nm
Receiver Sensitivity
-23
dBm
3
Receiver Overload
-3
dBm
3
LOS De-Assert
LOSD
-24
dBm
LOS Assert
LOSA
-35
dBm
LOS Hysteresis
1
4
dB
Data Output Swing Differential
Vout
370
1800
mV
4
LOS
High
2.0
Vcc
V
Low
0.8
V
Notes:
The optical power is launched into
PECL input, internally AC-coupled and
Measured with a PRBS 27-1 test pattern @1250Mbps, BER ≤1×10-12.
Internally AC-coupled.
Timing and Electrical
Table4–TimingandElectrical
Parameter
Symbol
Min
Typical
Max
Unit
Tx Disable Negate Time
t_on
1
ms
Tx Disable Assert Time
t_off
10
µs
Time To Initialize, including Reset of Tx Fault
t_init
300
ms
Tx Fault Assert Time
t_fault
100
µs
Tx Disable To Reset
t_reset
10
µs
LOS Assert Time
t_loss_on
100
µs
LOS De-assert Time
t_loss_off
100
µs
Serial ID Clock Rate
f_serial_clock
400
KHz
MOD_DEF (0:2)-High
VH
2
Vcc
V
MOD_DEF (0:2)-Low
VL
0.8
V
Diagnostics
Table 5 – Diagnostics Specification
Parameter
Range
Unit
Accuracy
Calibration
Temperature
0 to +70
°C
±3°C
Internal / External
-40 to +85
Voltage
3.0 to 3.6
V
±3%
Internal / External
Bias Current
0 to 100
mA
±10%
Internal / External
TX Power
-5 to +2
dBm
±3dB
Internal / External
RX Power
-23 to -3
dBm
±3dB
Internal / External
Pin Descriptions
Pin
Signal Name
Description
PlugSeq.
Notes
1
VEET
Transmitter Ground
1
2
TX FAULT
Transmitter Fault Indication
3
Note 1
3
TX DISABLE
Transmitter Disable
3
Note 2
4
MOD_DEF(2)
SDA Serial Data Signal
3
Note 3
5
MOD_DEF(1)
SCL Serial Clock Signal
3
Note 3
6
MOD_DEF(0)
TTL Low
3
Note 3
7
Rate Select
Not Connected
3
8
LOS
Loss of Signal
3
Note 4
9
VEER
Receiver ground
1
10
VEER
Receiver ground
1
11
VEER
Receiver ground
1
12
RD-
Inv. Received Data Out
3
Note 5
13
RD+
Received Data Out
3
Note 5
14
VEER
Receiver ground
1
15
VCCR
Receiver Power Supply
2
16
VCCT
Transmitter Power Supply
2
17
VEET
Transmitter Ground
1
18
TD+
Transmit Data In
3
Note 6
19
TD-
Inv. Transmit Data In
3
Note 6
20
VEET
Transmitter Ground
1
Notes:
Plug Seq.: Pin engagement sequence during hot plugging.
TX Fault is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor on the host board to a voltage between 2.0V and Vcc+0.3V. Logic 0 indicates normal operation; Logic 1 indicates a laser fault of some kind. In the low state, the output will be pulled to less than 8V.
TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a 7k~10kΩ resistor. Its states are:
Low (0 to 0.8V): Transmitter on
(>0.8V, < 2.0V): Undefined
High (2.0 to 3.465V): Transmitter Disabled Open: Transmitter Disabled
Mod-Def 0,1,2. These are the module definition They should be pulled up with a 4.7k~10kΩ resistor on the host board. The pull-up voltage shall be VccT or VccR.
Mod-Def 0 is grounded by the module to indicate that the module is present Mod-Def 1 is the clock line of two wire serial interface for serial ID
Mod-Def 2 is the data line of two wire serial interface for serial ID
LOS is an open collector output, which should be pulled up with a 4.7k~10kΩ Pull up voltage between 2.0V and Vcc+0.3V. Logic 1 indicates loss of signal; Logic 0 indicates normal operation. In the low state, the output will be pulled to less than 0.8V.
RD-/+: These are the differential receiver outputs. They are internally AC-coupled 100 differential lines which should be terminated with 100Ω (differential) at the user
TD-/+: These are the differential transmitter They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.
