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40KM SFP+ ER Optical Transceiver SPT-SFP+-ER

1550nm 1G fiber optic transceiver


  • Compliant with SFF-8413 and IEE802.3ae
  • Data rate selectable ≤4.25Gbps or 9.95Gbps to 10.3Gbps bit rates
  • Cooled EML transmitter and PIN receiver
  • link length up to 40km
  • Low Power Dissipation 1.5W Maximum
  • -5ºC to 70ºC Operating Case Temperature
  • Single 3.3V power supply
  • Diagnostic Performance Monitoring of module temperature, supply Voltages, laser bias current, transmit optical power, receive optical power
  • RoHS compliant and lead free


  • 10GBASE-ER/EW (with/without FEC)
  • 10G Fiber Channel (with/without FEC)


SOPTO SFP+ER Transceiver is designed for 10GBASE-ER/EW, and 8.5G/10G Fiber- Channel applications.
The transceiver consists of two sections: The transmitter section incorporates a colded EML laser. And the receiver section consists of a PIN photodiode integrated with a TIA. All modules satisfy class I laser safety requirements. SOPTO SFP+ER Digital diagnostics functions are available via a 2-wire serial interface, as specified in SFF-8472, which allows real-time access to device operating parameters such as transceiver temperature, laser bias current, transmitted optical power, received optical power and transceiver supply voltage.

Absolute Maximum Ratings

Parameter Symbol Min Max Unit
Supply Voltage Vcc -0.5 3.8 V
Storage Temperature Tst -40 85 ºC
Relative Humidity Rh 0 85 %

Operating Conditions

Parameter Symbol Min Typical Max Unit
Supply Voltage Vcc 3.13 3.3 3.47 V
Supply current Icc   360 450 mA
Operating Case temperature Tca -5 - 70 ºC
Module Power Dissipation Pm - 1.2 1.5 W

[1] Supply current is shared between VCCTX and VCCRX.
[2] In-rush is defined as current level above steady state current requirements.

Transmitter Specifications – Optical

Parameter Symbol Min Typical Max Unit
Center Wavelength lc 1530   1565 pm
Optical Average Power Po -3 - 3 dBm
Optical OMA Power Pom -2.1     dBm
Side Mode Suppression Ratio SMSR 30 - - dB
Optical Transmit Power (disabled) PTX_DISABLE - - -30 dBm
Extinction Ratio ER 6   - dB

[1] RIN measurement is made with a return loss at 21 dB.

Transmitter Specifications – Electrical

Parameter Symbol Min Typical Max Unit
Data Rate Mra - 10.3 11.3 Gbps
Input differential impedance Rim - 100 - Ω
Differential data Input VtxDIFF 120 - 850 mV
Transmit Disable Voltage VD 2 - Vcc3+0.3 V
Transmit Enable Voltage Ven 0 - 0.8 V
Transmit Disable Assert Time Vn - - 100 us

Receiver Specifications – Optical

Parameteraaa Symbol Min Typical Max Unit
Input Operating Wavelength λ 1530 - 1565 nm
Average receive power   - - -1 dBm
Receiver sensitivity in OMA   - - -14.1 dBm
Stressed receiver sensitivity in OMA[1]       -11.3 dBm
Maximum Input Power RX-overload - - -1 dBm
Reflectance Rrx - - -27 dB
Loss of Signal Asserted   -25 - - dBm
LOS De-Asserted   - - -16 dBm
LOS Hysteresis   0.5 - - dB

[1] Measured with conformance test signal for BER = 10–12. The stressed sensitivity values in the table are for system level BER measurements which include the effects of CDR circuits. It is recommended that at least 0.4 dB additional margin be allocated if component level measurements are made
without the effects of CDR circuits.

Receiver Specifications – Electrical

Parameter Symbol Min Typical Max Unit
Data Rate Mra - 10.3 11.3 Gbps
Differential Output Swing Vout P-P 350 - 850 mV
Rise/Fall Time Tr / Tf 24 - - ps
Loss of Signal –Asserted VOH 2 - Vcc3+0.3- V
Loss of Signal –Negated VOL 0 - 0.4 V


Figure1.Electrical Pin-out Details

Pin Descriptions

Pin Symbol Name/Description
1 VEET [1] Transmitter Ground
2 Tx_FAULT [2] Transmitter Fault
3 Tx_DIS [3] Transmitter Disable. Laser output disabled on high or open
4 SDA [2] 2-wire Serial Interface Data Line
5 SCL [2] 2-wire Serial Interface Clock Line
6 MOD_ABS [4] Module Absent. Grounded within the module
7 RS0 [5] RS0 for Rate Select: Open or Low = Module supports ≤4.25Gbps High = Module supports 9.95 Gb/s to 10.3125 Gb/s
8 RX_LOS [2] Loss of Signal indication. Logic 0 indicates normal operation
9 RS1 [5] No connection required
10 VEER [1] Receiver Ground
11 VEER [1] Receiver Ground
12 RD- Receiver Inverted DATA out. AC Coupled
13 RD+ Receiver DATA out. AC Coupled
14 VEER [1] Receiver Ground
15 VCCR Receiver Power Supply
16 VCCT Transmitter Power Supply
17 VEET [1] Transmitter Ground
18 TD+ Transmitter DATA in. AC Coupled
19 TD- Transmitter Inverted DATA in. AC Coupled
20 VEET [1] Transmitter Ground

[1] Module circuit ground is isolated from module chassis ground within the module.
[2].should be pulled up with 4.7k – 10k ohms on host board to a voltage between 3.15Vand 3.6V.
[3]Tx_Disable is an input contact with a 4.7 kΩ to 10 kΩ pullup to VccT inside the module.
[4]Mod_ABS is connected to VeeT or VeeR in the SFP+ module. The host may pull this contact up to Vcc_Host with a resistor in the range 4.7 kΩ to10 kΩ.Mod_ABS is asserted “High” when the SFP+ module is physically absent from a host slot.
[5] RS0 and RS1 are module inputs and are pulled low to VeeT with > 30 kΩ resistors in the module.

Figure2. Host Board Power Supply Filters Circuit

Figure3. Host-Module Interface


Figure6. Mechanical Specifications

Ordering information

Part Number Product Description
SPT - SFP+ - ERC 10Gbps, 1550nm SFP+ER 40km, -5ºC ~ +70ºC


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