Applications ● 1G Fiber Channel, Switch to Switch Interface ● Gigabit Ethernet, Switched Backplane Applications ● Broadband aggregation and wireless infrastructure ● Router/Server Interface ● Other Optical networking Description Optcore OSP1250-3120xxR is high performance and cost-effective small form factor pluggable (SFP) transceiver module for 1000BASE-LX/LH Gigabit Ethernet per IEEE802.3z and 1G Fiber Channel application. It supports dual data-rate of 1.25Gbps/1.06Gbps and 20km transmission distance with 9/125um single mode fiber. This 1.25G SFP LX transceiver module fully complies with the SFP Multi-Sourcing Agreement (MSA) and can be used on MSA compliant SFP ports of optical networking equipment. The transmitter section uses a 1310nm FP laser that is a class 1 laser product compliant according to International Safety Standard IEC 60825. The receiver section uses a high-speed PIN photodiode integrated with a trans-impedance preamplifier (TIA). There are three versions of the series 1.25Gb/s SFP LX optical transceiver modules for different applications. The Standard grade (0~70ºC) is for commonly commercial application, the Extended grade (-10~85ºC) is for Extended temperature application, and the Industrial grade (-40~85ºC) is made with robust and reliable components to meet the needs of Industrial Ethernet application under harsh environmental conditions. Absolute Maximum Ratings Parameter Symbol Min Max Unit Notes Maximum Supply Voltage Vcc -0.5 4.0 V Storage Temperature TS -40 85 °C Operating Humidity RH 5 95 % Recommended Operating Conditions Parameter Symbol Min. Typ. Max. Unit Notes Power Supply Voltage Vcc 3.13 3.3 3.47 V Power Supply Current Icc 250 mA Case Operating Temperature Tc 0 70 °C Standard -10 85 °C Extended -40 85 °C Industrial Data Rate 1.25 Gbps Gigabit Ethernet 1.06 Gbps Fiber Channel Transmission Distance 20 km 9/125µm SMF Optical Characteristics Parameter Symbol Min. Typ. Max. Unit Notes Transmitter Center Wavelength λC 1270 1310 1360 nm Average Output Power P0ut -9 -3 dBm 1 Spectral Width (RMS) σ 4 nm Extinction Ratio ER 9 dB 1 Optical Rise/Fall Time Tr-Tf 0.26 ns 2 Total Jitter 0.431 UI Output Optical Eye Compliant with IEEE802.3 z (class 1 laser safety) Receiver Center Wavelength λC 1270 – 1610 nm Receiver Sensitivity -22 dBm 3 Receiver Overload -3 dBm 3 LOS De-Assert LOSD -24 dBm LOS Assert LOSA -35 dBm LOS Hysteresis 0.5 6 dB Measured at 1.25Gbps with PRBS 27– 1 NRZ test pattern. Unfiltered, measured with a PRBS 27-1 test pattern @1.25Gbps Measured at 1250 Mb/s with PRBS 27– 1 NRZ test pattern for BER < 1×10-12 Electrical Input/Output Characteristics Parameter Symbol Min. Typ. Max. Unit Notes Transmitter Input differential impedance ZIN 100 Ω Data Input Swing Differential Vin,pp 300 1600 mV TX Disable – High VIH 2.0 Vcc 0.3 V TX Disable – Low VIL 0 0.8 V TX Fault – High VOH 2.0 Vcc 0.3 V TX Fault – Low VOL 0 0.5 V Receiver Data Output Swing Differential Vout,pp 400 1000 mV RX LOS – High VLOS 2.0 Vcc 0.3 V RX LOS – Low VLOS 0 0.8 V Pin Descriptions Pin Signal Name Description Plug Seq. Notes 1 VEET Transmitter Ground 1 2 TX FAULT Transmitter Fault Indication 3 Note 1 3 TX DISABLE Transmitter Disable 3 Note 2 4 MOD_DEF(2) SDA Serial Data Signal 3 Note 3 5 MOD_DEF(1) SCL Serial Clock Signal 3 Note 3 6 MOD_DEF(0) Model present indication 3 Note 3 7 Rate Select Not Connected 3 8 LOS Loss of Signal 3 Note 4 9 VEER Receiver ground 1 10 VEER Receiver ground 1 11 VEER Receiver ground 1 12 RD- Inverse Received Data Out 3 Note 5 13 RD Received Data Out 3 Note 5 14 VEER Receiver ground 1 15 VCCR Receiver Power Supply 2 16 VCCT Transmitter Power Supply 2 17 VEET Transmitter Ground 1 18 TD Transmit Data In 3 Note 6 19 TD- Inv. Transmit Data In 3 Note 6 20 VEET Transmitter Ground 1 Notes: 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. 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 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 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. 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. TD-/ : These are the differential transmitter inputs. They are internally AC-coupled, differential lines with 100Ω differential termination inside the module. Optcore 1.25Gb/s SFP LX optical transceiver 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, Optcore 1.25Gb/s SFP LX optical transceiver provide an optional 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 module. 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 this 1.25G SFP LX optical transceiver is internally calibrated by default.
