Syrotech Goxs-1312-40d Sfp (1.25g) Module, 40km, Single Mode Dual Fibre


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SKU: GOXS-1312-40D Category:


PDF : Goxs-1312-40d-sfp-1-25g-module-40km-single-mode


1.25Gbps SFP Optical Transceiver, 40km Reach


  • Dual data-rate of 25Gbps/1.063Gbps operation
  • 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


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


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



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
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  

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   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


High 2.0   Vcc V  
Low     0.8 V  


  1. The optical power is launched into
  2. PECL input, internally AC-coupled and
  3. Measured with a PRBS 27-1 test pattern @1250Mbps, BER ≤1×10-12.
  4. 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



Table 5 – Diagnostics Specification

Parameter Range Unit Accuracy Calibration


0 to +70  





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 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  


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.



For more information please contact

Whatsapp/Call :8527090690





Additional information

Weight 0.1 kg
Dimensions 11 × 11 × 3 cm