1250M BI-DI LC SFP Transceiver With DDM

1. SONT/SDH/PDH
2. FDDI
3. Fiber Channel

Function description：
The BI-DI SFP (Small Form Factor Pluggable ) transceivers is compliant with SFP MSA (Multi-Source Agreement ). All modules satisfy Class I Laser Safety requirements in accordance with the international EN 60825-1 standards.
The transmit and receive functions are contained in a SFP 20 pin package with a simplex LC connector interface. The transmitter incorporates a highly reliable 1310 nm or 1550 nm Laser (FP laser for narrow distance and DFB laser for Intermediate、long distance) and a driver circuit which converts data to light with APC function. The output power can be disable via he single TX_Disable pin. Logic LVTTL HIGH level disables the transmitter. The receiver incorporates an efficient InGaAs/InP PIN or APD photodiode receiver converting the light signal into an electrical current which is amplified and regenerated into data. The postamplifier is AC coupled to preamplifier through a capacitor and a low pass filter. It can be enough to pass the signal 1250Mb/s without significant sensitivity. A Signal Detect status output flag is also provided.

The transceiver operates from a single +3.3V power supply over an operating temperature range of 0 to +70°C. The transceiver uses the SFP 20-pin connector to allow hot plug capability. Detailed product information in EEPROM and digital diagnostic monitoring is offered

Recommended Circuit：

EEPROM Description:

The BI-DI SFP module contains an EEPROM. It provides access to sophisticated identification information that describes the transceiver’s capabilities, standard interfaces, manufacturer. The serial interface uses the 2-wire serial CMOS EEPROM protocol defined for the ATMEL AT24C01A/02/04 family of components. When the serial protocol is activated, the host generates the serial clock signal (SCL MOD_DEF1). The positive edge clocks data into those segments of the EEPROM that are not write-protected within the SFP transceiver. The negative edge clocks data from the SFP transceiver. The serial data signal (SDA MOD_DEF2) is bi-directional for serial protocol activation. The memories are organized as a series of 8-bit data words that can be addressed individually or sequentially.