GAOTek SFP CWDM Transceiver SFPCW-103, 155Mb/s and 120km

This 155Mbps SFP CWDM transceiver is used with Single-mode fiber to span up to 74.5 Miles (120Km) transmission distance


Key Features

  • Up to 74.5 Miles(120km) on 9/125µm SMF
  • Up to 155 Mb/s data links
  • Compliant with SFF-8472
  • DFB laser transmitter and PIN photo-detector
  • Hot-pluggable SFP footprint
  • Duplex LC/UPC type pluggable optical interface
  • Low power dissipation
  • Metal enclosure, for lower EMI
  • RoHS compliant and lead-free
  • Support Digital Diagnostic Monitoring interface
  • Case operating temperature range from commercial: 32°F to 158°F (0°C to +70°C)Extended: 14°F to 176°F (-10°C to +80°C)Industrial: -40°F to 185°F (-40°C to +85°C)
  • Single +3.3V power supply



Technical Specifications

Protocol2-wire serial communication protocol

IEC/EN 61000-4-2

FCC Part 15 Class B EN 55022 Class B (CISPR 22A)

FDA 21CFR 1040.10, 1040.11 IEC/EN 60825-1,2

IEC/EN 60950 ,UL

RoHS 2002/95/EC


Working RangeUp to 74.5 Miles(120 Km)
Data rate155 Mb/s
Transmitter Extinction Ratio8.2 dB
Transmitter Off Output Power-45dBm
Transmitter Differential Line Input Impedance90-110 Ω
Receiver Sensitivity-34dBm
Receiver Input Optical Wavelength1270-1610nm
Receiver Input Saturation Power(Overload)-10 dBm
Supply Voltage-0.5 to 4V
Dimensions2.29in*0.54in*0.33 in                                  (L  58.4mm*W 13.9mm*H 8.5mm)
Relative Humidity5% to 95%
Storage Temperature-40°F to 185°F (-40°C to 85°C)
Case Operating Temperature32°F to +158°F (0°C to 70°C) for Commercial use

14°F to 176°F ( -10°C to +80°C) for Extended use

-40°F to 185°F (-40°C to +85°C) for Industrial use



Product Selection

WavelengthClasp Color code
1270 nmGray
1290 nmGray
1310 nmGray
1330 nmPurple
1350 nmBlue
1370 nmGreen
1390 nmYellow
1410 nmOrange
1430 nmRed
1450 nmBrown
1470 nmGray
1490 nmPurple
1510 nmBlue
1530 nmGreen
1550 nmyellow
1570 nmOrange
1590 nmred
1610 nmBrown

PIN Descriptions:


  1. Circuit ground is internally isolated from chassis ground.
  2. Laser output disabled on TDIS >2.0V or open, enabled on TDIS<0.8V
  3. Should be pulled up with 4.7k – 10kohms on host board to a voltage between 2.0V and 3.6V.MOD_DEF (0) pulls line low to indicate module is plugged in.
  4. This is an optional input used to control the receiver bandwidth for compatibility with multiple data rates (most likely Fiber Channel 1x and 2x Rates).If implemented, the input will be internally pulled down with > 30kΩ resistor. The input states are:
  • Low (0 – 0.8V): Reduced Bandwidth
  • (>0.8, < 2.0V): Undefined
  • High (2.0 – 3.465V): Full Bandwidth
  • Open: Reduced Bandwidth
  1. LOS is open collector output should be pulled up with 4.7k – 10kohms on host board to a voltage between 2.0V and 3.6V. Logic 0 indicates normal operation; logic 1 indicates loss of signal.

Electrical Interface Characteristics:

Note (1): A (TX) + B (RX) = 280mA (Not include termination circuit)

Digital Diagnostic Functions

GAOTek GAO-SFPCW-103 transceivers support the 2-wire serial communication protocol as defined in the SFP MSA. It is very closely related to the E2PROM defined in the GBIC standard, with the same electrical specifications. The standard SFP serial ID provides access to identification information that describes the transceiver’s capabilities, standard interfaces, manufacturer, and other information.

Additionally, GAOTek SFP transceivers provide a unique enhanced digital diagnostic monitoring interface, 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 .It also defines a sophisticated system of alarm and warning flags, which alerts end-users when particular operating parameters are outside of a factory set normal range.

The SFP MSA defines a 256-byte memory map in E2PROM that is accessible over a 2-wire serial interface at the 8 bit address 1010000X (A0h). The digital diagnostic monitoring interface makes use of the 8 bit address 1010001X (A2h), so the originally defined serial ID memory map remains unchanged. The interface is identical to, and is thus fully backward compatible with both the GBIC Specification and the SFP Multi Source Agreement.

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. When the serial protocol is activated, the serial clock signal (SCL, Mod Def 1) is generated by the host. The positive edge clocks data into the SFP transceiver into those segments of the E2PROM that are not write-protected. The negative edge clocks data from the SFP transceiver. The serial data signal (SDA, Mod Def 2) is bi-directional for serial data transfer. The host uses SDA in conjunction with SCL to mark the start and end of serial protocol activation. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.

Digital diagnostics for the GAO-SFPCW-103 are internally calibrated by default.

Recommended Circuit Schematic

Regulatory Compliance

Mechanical Specifications


  • Switch to Switch Interface
  • Fast Ethernet
  • Switched Backplane Applications
  • Router/Server Interface
  • Other Optical Links


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