GAOTek XFP CWDM Transceiver with 10 GB/s (40km, 1270~1410nm)

This 10 Gigabit 1270~1410nm XFP CWDM Transceiver is used with single mode optical fiber to reach up to 24.85 miles (40km) transmission distance.





This 10 Gigabit 1270~1410nm XFP CWDM Transceiver is used with single mode optical fiber to reach up to 24.85 miles (40km) transmission distance. This Coarse Wavelength Division Multiplexing small form-factor pluggable (XFP CWDM) has a Cooled CWDM DFB type transceiver and PIN type receiver. It provides built-in Digital Diagnostics Functions. It complies with 10GBASE-ER/EW, 10G Fiber channel and RoHS lead free standards.

Key Features:

    • Up to 24.85 miles (40km) transmission distance.
    • Uncooled CWDM DFB and PIN Receiver
  • Supports 9.95Gb/s to 11.3Gb/s bit rates
  • Hot-pluggable XFP footprint
  • Supports Line-side and XFI loopback
  • RoHS-6 Compliant (lead-free)
  • Power dissipation <3.5W
  • Full Duplex LC connector
  • No Reference Clock required
  • Built-in digital diagnostic functions
  • Standard bail release mechanism
  • Case operating temperature range from 32 °F to 158 °F (0°C to 70°C).

Technical Specifications:

Working Range Up to 24.85 miles (40km)
Standards 10GBASE-ER/EW As per IEEE 802.3ae requirements.

Class 1 Laser Product.

10G Fiber Channel.

RoHS-6 compliant.

Memory 256 byte EEPROM
Data rate 10Gb/s
Wavelength 1270~1410nm
Connector LC
Transmitter CWDM DFB
Receiver PIN
Transmitter output optical Power 0 dBm to 5 dBm
Receiver Sensitivity -15.5 dBm
Receiver Input Saturation Power +0.5 dBm
Supply Voltage 3.13V to 3.45 V
Maximum Power Consumption <3.5 W
Transmitter Input Differential Impedance 100Ω
Dimensions 3.07in x 0.72in x 0.45in (L 78mm x W18.3mm x   H 11.4mm)
Relative Humidity 5% to 95%
Storage Temperature -40 °F to 185 °F (-40°C to 85°C)
Case Operating Temperature 32 °F to 158 °F (0°C to 70°C)

Additional Information:


Ideal to be used on applications such as

  • Fiber Channel
  • SONET OC-192&SDH STM-64
  • 10GBASE-ER/EW 10G Ethernet

Order Information:

Product ID Media Wavelength


Transmission Distance Temperature Range


single-mode fiber 1270 nm ~ 1410 nm 24.85 miles (40km) 32 °F to 158 °F (0°C to 70°C)

Wavelength Selection:

Wavelength Clasp Color code
1270 nm Gray
1290 nm Gray
1310 nm Gray
1330 nm Purple
1350nm Blue
1370nm Green
1390nm yellow
1410nm Orange
1430nm Red
1450nm Brown

Digital Diagnostics Functions:

  • GAOTek GAO- XFPCW -104 transceiver support the 2-wire serial communication protocol as defined in the XFP MSA.
  • Additionally, GAOTek XFP Transceivers provide a unique enhanced digital diagnostic monitoring interface which allows real-time access to device operating parameters such as transmitter optical power, receiver optical power, transceiver temperature, transceiver supply voltage and laser bias current. It defines an alarm system and warning flags, which alerts the end users when particular operating parameters are outside of a factory set normal range.
  • Standard XFP Serial id provides access to identification information that describes the transceiver’s capabilities, standard interfaces, manufacturer and other information.
  • XFP MSA defines a 256-byte memory map in EEPROM that is accessible over a 2 wire serial interface at the 8 bit address 1010000X (A0h).
  • The operating and diagnostics information is monitored and reported by a Digital Diagnostics Transceiver Controller (DDTC) inside the transceiver, which is accessed through a 2-wire serial interface. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.

General Specifications:

Parameter Symbol Min Type Max Unit Note
Bit Rate BR 9.95   11.3 Gb/s  
Bit Error Ratio BER     10-12   1
Maximum Supported Distances       40 km  


  1. Tested with a 2 31 – 1 PRBS

Electrical characteristics:

Parameter Symbol Min Type Max Unit Note
Module Total Power       3.5 W 1
Input Differential Impedance Rin 100 2
Single ended data input swing Vin, pp 120 820 mV
Transmit Disable Voltage VD 2.0 Vcc V 3
Transmit Enable Voltage Ven GND GND+ 0.8 V
Transmit Disable Assert Time 10 us
Differential data output swing Vout,pp 340 650 850 mV 4
Data output rise time tr 38 ps 5
Data output fall time tf 38 ps 5
LOS Fault VLOS fault Vcc–0.5 VccHOST V 6
LOS Normal VLOS norm GND GND+0.5 V 6
Power Supply Rejection PSR 7


  1. Maximum total power value is specified across the full temperature and voltage range.
  2. After internal AC coupling.
  3. Open circuit.
  4. Into 100 ohms differential termination.
  5. These are unfiltered 20-80% values
  6. Loss of Signal is open collector to be pulled up with a 4.7kΩ – 10kΩ resistor to 3.15 – 3.6V.
  • Logic 0 indicates normal operation.
  • Logic 1 indicates no signal detected.
  1. As per the XFP MSA Specification 1.

Optical Characteristics:

Parameter Symbol Min Type Max Unit
Average Optical  Power PAVE 0 5 dBm
Optical Wavelength λ λ-6.5 λ+6.5 nm
Optical Extinction Ratio ER 3.5 dB
Average Launch power of transmitter POFF -30 dBm
Side mode Suppression ratio SMSR 30 dB
Transmitter and Dispersion Penalty TDP 2 dB
Relative Intensity Noise RIN -130 dB/Hz
Receiver Sensitivity PSEN -15.5 dBm
Wavelength Range λC 1270 1610 nm
Input Saturation Power (Overload) Psat 0.5 dBm
Receiver Reflectance Rrx -27 dB
LOS Assert LOSA -28 dBm
LOS De -Assert LOSD -22 dBm
LOS Hysteresis 0.5 dB

PIN Diagram:

PIN Descriptions:

Pin Logic Symbol Name/Description Note
1. GND Module Ground 1
2. VEE5 Optional –5.2 Power Supply – Not required
3. LVTTL-I Mod-Desel Module De-select; When held low allows the module to respond to 2-wire serial interface commands
4. LVTTL-O Interrupt Interrupt (bar); Indicates presence of an important condition which can be read over the serial 2-wire interface 3
5. LVTTL-I TX_DIS Transmitter Disable; Transmitter laser source turned off
6. VCC5 +5 Power Supply
7. GND Module Ground 1
8. VCC3 +3.3V Power Supply
9. VCC3 +3.3V Power Supply
10. LVTTL-I SCL Serial 2-wire interface clock
11. LVTTL-I/O SDA Serial 2-wire interface data line 3
12. LVTTL-O Mod_Abs Module Absent; Indicates module is not present. Grounded in the module. 3
13. LVTTL-O Mod_NR Module Not Ready; GAOTek defines it as a logical OR between RX_LOS and Loss of Lock in TX/RX. 3
14. LVTTL-O RX_LOS Receiver Loss of Signal indicator 3
15. GND Module Ground 1
16. GND Module Ground 1
17. CML-O RD- Receiver inverted data output
18. CML-O RD+ Receiver non-inverted data output
19. GND Module Ground 1
20. VCC2 +1.8V Power Supply – Not required
21. LVTTL-I P_Down/RST Power Down; When high, places the module in the low power stand-by mode and on the falling edge of P_Down initiates a module reset


Reset; The falling edge initiates a complete reset of the module including the 2-wire serial interface, equivalent to a power cycle.
22. VCC2 +1.8V Power Supply – Not required
23. GND Module Ground 1
24. PECL-I RefCLK Reference Clock non-inverted input, AC coupled on the host board –Not required 2
25. PECL-I RefCLK- Reference Clock inverted input, AC coupled on the host board – Not required 2
26. GND Module Ground 1
27. GND Module Ground 1
28. CML-I TD- Transmitter inverted data input
29. CML-I TD+ Transmitter non-inverted data input
30. GND Module Ground 1


  1. Module circuit ground is isolated from module chassis ground within the module.
  2. A Reference Clock input is not required .If present, it will be ignored.
  3. Open collector; should be pulled up with 4.7kΩ – 10kΩ on host board to a voltage between 3.15V and 3.6V.

PCB Layout and Bezel Recommendations:

XFP Host Board Mechanical Layout (dimensions are in mm)

Mechanical Specifications:

GAOTek’s XFP transceivers are compliant with the dimensions defined by the XFP Multi-Sourcing Agreement (MSA).

XFP transceiver (dimensions are in mm)

Regulatory Compliance:

Feature Reference Performance
Laser Eye Safety FDA 21CFR 1040.10, 1040.11 IEC/EN 60825-1,2 Class 1 laser product
Component Recognition IEC/EN 60950, UL Compatible with standards
ROHS 2002/95/EC Compatible with standards
Electrostatic discharge(ESD) IEC/EN 61000-4-2 Compatible with standards
EMC EN61000-3 Compatible with standards
Electromagnetic Interference(EMI) FCC Part 15 Class B EN 55022 Class B (CISPR 22A) Compatible with standards