1.25Gbps CWDM SFP Transceiver, 80KM

Features :-

• SFP package with LC connector
• CWDM DFB laser with Isolator and PIN photo detector
• Up to 80Km transmission on SMF
• +3.3V single power supply
• LVPECL compatible data input/output interface
• Low EMI and excellent ESD protection
• Laser safety standard IEC-60825 compliant
• Digital Diagnostic SFF-8472 compliant

Description :-

SFP (small form-factor pluggable) or mini-GBIC input/output transceivers are compact and hot-pluggable for converting optical and electrical media; it is widely used for both data communication and telecommunication applications. Moreover, this SFP are fully compliant with the SFP MSA (Multisource Agreement) specifications, and specially designed to support SONET, Ethernet, Fiber Channel, and other communications standards.

This CWDM SFP transceiver supports dual data-rate of 1.25Gbps and transmission distance of 80km with SMF (Single-mode Fiber). The SFP Transceivers consist of three sections: an un-cooled CWDM 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. Furthermore, the transceivers are compatible with SFP Multi-Source Agreement (MSA) and SFF-8472. For further information, please refer to SFP MSA.

Specification : -

Absolute Maximum Rating:

Operation Environment:

lC Wavelength Guide:

Optical and Electrical Characteristics:

Notes:

1. The optical power is launched into SMF.

2. PECL input, internally AC-coupled and terminated.

3. Measured with a PRBS 27-1 test pattern @1250Mbps, BER ≤1×10-12.

4. Internally AC-coupled.

Timing and Electrical:

Diagnostics Specifications:

Digital Diagnostic Memory Map:

The transceivers provide serial ID memory contents and diagnostic information about the present operating conditions by the 2-wire serial interface (SCL, SDA). 
The diagnostic information with internal calibration or external calibration all are implemented, including received power monitoring, transmitted power monitoring, bias current monitoring, supply voltage monitoring and temperature monitoring.

The digital diagnostic memory map specific data field defines as following.

PIN Diagram:

Pin Description:

Notes: Plug Seq.: Pin engagement sequence during hot plugging.

1. 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 0.8V.

2. TX Disable is an input that is used to shut down the transmitter optical output. It is pulled up within the module with a 4.7k~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

3. Mod-Def 0,1,2. These are the module definition pins. 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

4. LOS is an open collector output, which should be pulled up with a 4.7k~10kΩ resistor. 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.

5. 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 SERDES.

6. TD-/+: These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module.

Application :-

• Ethernet
• Telecom
• Fiber Channel

Recommended Application Circuit: