Alpha Bridge AB-GE-20 Datasheet

Features

  • Dual data-rate of 25Gbps/1.063Gbps operation
  • 1310nm FP laser and PIN photodetector for 20km 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 Industrial: 40 to +85°C

Applications

  • Gigabit Ethernet
  • Fiber Channel
  • Switch to Switch interface
  • Switched back plane applications
  • Router/Server interface
  • Other optical transmission systems

Product Description

The SFP transceivers are high-performance, cost-effective modules supporting dual data rate of 1.25Gbps/1.0625Gbps and 20km transmission distance with SMF.

The transceiver consists of three sections: an FP laser transmitter, a PIN photodiode integrated with a trans-impedance preamplifier (TIA), and an MCU control unit. All modules satisfy class I laser safety requirements.

The transceivers are compatible with the SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA.

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
Industrial -40 +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  

Optical and Electrical Characteristics

Parameter Symbol Min Typical Max Unit Notes
Transmitter
Centre Wavelength λc 1260 1310 1360 nm  
Spectral Width (RMS) ∆λ     4 nm  
Average Output Power Pout -9   -3 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       -23 dBm 3
Receiver Overload   -3     dBm 3
LOS De-Assert LOSD     -24 dBm  
LOS Assert LOSA -30     dBm  
LOS Hysteresis   1   4 dB  
Data Output Swing Differential Vout 400   1800 mV 4
LOS High 2.0   Vcc V  
Low   0.8 V  

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

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 -9 to -3 dBm ±3dB Internal / External
RX Power -23 to -3 dBm ±3dB Internal / External

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 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  

Ordering Information

Part Number Product Description
AB-GE-20 1.25Gbps 1310nm 20km DDM SFP 0ºC ~ +70ºC
AB-GE-20-I 1.25Gbps 1310nm 20km DDM SFP -40ºC ~ +85ºC
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