155Mbps SFP Transceiver, Single Mode, 120km Reach

155Mbps SFP Transceiver, Single Mode, 120km Reach

  • 描述
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Product Features

  • Supports up to 155Mbps bit rates
  • Hot-pluggable SFP footprint
  • 1550nm DFB laser and PIN photo detector, Up to 120km for SMF transmission
  • Compliant with SFP MSA and SFF-8472 with duplex LC receptacle
  • Compatible with RoHS
  • Single +3.3V power supply
  • Real Time Digital Diagnostic Monitoring
  • Operating case temperature:

Standard:  0 to +70°C

Industrial: -40 to +85°C



  • 155Mbps Optical systems
  • Fast Ethernet
  • SONET OC-3 LR2,LR2
  • Other Optical links



The SFP transceivers are high performance, cost effective modules supporting data rate of 125Mbps/155Mbps and 120km 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.


The transceivers are compatible with SFP Multi-Source Agreement and SFF-8472 digital diagnostics functions.



Transceiver functional diagram

 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

Parameter Symbol Min Typical Max Unit
Operating Case Temperature Standard Tc 0 +70 °C
Extended -20 +80 °C
Industrial -40 +85 °C
Power Supply Voltage Vcc 3.135 3.30 3.465 V
Power Supply Current Icc 300 mA
Data Rate 155 Mbps


Optical and Electrical Characteristics

Parameter Symbol Min Typical Max Unit Notes
Centre Wavelength λc 1530 1550 1570 nm
Spectral Width(-20dB) Δλ 1 nm
Side-Mode Suppression Ratio SMSR 30 dB
Average Output Power Pout -2 +3 dBm 1
Extinction Ratio ER 9.0 dB
Data Input Swing Differential VIN 180 1200 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
Centre Wavelength λc 1260 1610 nm
Receiver Sensitivity -34 dBm 3
Receiver Overload -8 dBm 3
LOS De-Assert LOSD -35 dBm
LOS Assert LOSA -45 dBm
LOS Hysteresis 0.5 4 dB
Data Output Swing Differential Vout 600 800 1000 mV 4
LOS High 2.0 Vcc V
Low 0.8 V


  1. The optical power is launched into SMF.
  2. PECL input, internally AC-coupled and terminated.
  3. Measured with a PRBS 223-1 test pattern @155Mbps, BER ≤1×10-12.
  4. Internally AC-coupled.

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 100 400 KHz
MOD_DEF (0:2)-High VH 2 Vcc V
MOD_DEF (0:2)-Low VL 0.8 V



Parameter Range Unit Accuracy Calibration
Temperature   0 to +70 °C ±3°C Internal
-20 to +80
-40 to +85
Voltage 3.0 to 3.6 V ±3% Internal
Bias Current 0 to 100 mA ±10% Internal
TX Power -2 to +3 dBm ±3dB Internal
RX Power -34 to -6 dBm ±3dB Internal


Digital Diagnostic Memory Map

The transceivers provide serial ID memory contents and diagnostic information about the present operating conditions by the 2-wire serial interface (SCL, SDA).

The diagnostic information with internal calibration or external calibration all are implemented, including received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring.

The digital diagnostic memory map specific data field defines as following.


 Pin Descriptions


Pin Signal Name Description Plug Seq. Notes
1 VEET Transmitter Ground 1
2 TX FAULT Transmitter Fault Indication 3 Note 1
3 TX DISABLE Transmitter Disable 3 Note 2
4 SDA SDA Serial Data Signal 3
5 SCL SCL Serial Clock Signal 3
6 MOD_ABS Module Absent. Grounded within the module 3
7 RS0 Not Connected 3
8 LOS Loss of Signal 3 Note 3
9 VEER Receiver ground 1
10 VEER Receiver ground 1
11 VEER Receiver ground 1
12 RD- Inv. Received Data Out 3 Note 4
13 RD+ Received Data Out 3 Note 4
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 5
19 TD- Inv. Transmit Data In 3 Note 5
20 VEET Transmitter Ground 1


Plug Seq.: Pin engagement sequence during hot plugging.

1) 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 0.8V.

2) Laser output disabled on TDIS >2.0V or open, enabled on TDIS <0.8V.

3) LOS is open collector output.  Should be pulled up with 4.7k~10kΩ on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

4) 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 SERDES.

5) TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.

Recommended Interface Circuit

 Mechanical Dimensions