1.25Gbps 1550nm 120km SFP Transceiver
Features
* Dual data-rate of 1.25Gbps/1.063Gbps operation
* 1550nm DFB laser and APD photodetector for 120km 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-1
* Compatible with RoHS
* +3.3V single power supply
* Operating case temperature:
Standard : 0 to +70°C
Extended : -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 120km transmission distance with SMF.
The transceiver consists of three sections: a DFB laser transmitter, a APD photodiode integrated with a trans-impedance preamplifier (TIA) and MCU control unit. All modules satisfy class I laser safety requirements.
The transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA.
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 |
|
|
Extended |
-20 |
|
+85 |
°C |
|||
|
Power Supply Voltage |
Vcc |
3.13 |
3.3 |
3.47 |
V |
||
|
Power Supply Current |
Icc |
|
|
300 |
mA |
||
|
Data Rate |
Gigabit Ethernet |
|
|
1.25 |
|
Gbps |
|
|
Fiber Channel |
|
|
1.063 |
|
|||
Table 3 - Optical and Electrical Characteristics
|
Parameter |
Symbol |
Min |
Typical |
Max |
Unit |
Notes |
||
|
Transmitter |
||||||||
|
Centre Wavelength |
λc |
1520 |
1550 |
1580 |
nm |
|
||
|
Spectral Width (-20dB) |
∆λ |
|
|
1 |
nm |
|
||
|
Average Output Power |
Pout |
0 |
|
5 |
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 |
|
1580 |
nm |
|
||
|
Receiver Sensitivity |
|
|
|
-31 |
dBm |
3 |
||
|
Receiver Overload |
|
-9 |
|
|
dBm |
3 |
||
|
LOS De-Assert |
LOSD |
|
|
-32 |
dBm |
|
||
|
LOS Assert |
LOSA |
-45 |
|
|
dBm |
|
||
|
LOS Hysteresis |
|
0.5 |
|
4.5 |
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 SMF.
- PECL input, internally AC-coupled and terminated.
- Measured with a PRBS 27-1 test pattern @1250Mbps, BER ≤1×10-12.
- Internally AC-coupled.
Timing and Electrical
Table 4 - Timing and Electrical
|
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 |
0 to +5 |
dBm |
±3dB |
Internal / External |
|
RX Power |
-30 to -9 |
dBm |
±3dB |
Internal / External |
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