DESCRIPTION
This CWDM DFB  10Gigabit SFP+ transceiver is designed to transmit and receive optical data over single mode optical fiber for link length 10km.
The  SFP+   LR  module  electrical   interface  is  compliant  to  SFI  electrical  specifications. The transmitter input and receiver output impedance is 100 Ohms differential.  Data lines are internally AC coupled.  The module provides differential termination and reduce differential to common mode conversion for quality signal termination and  low  EMI.   SFI typically  operates  over 200  mm  of improved FR4 material or up to about 150mmof standard FR4 with one connector.
The transmitter converts 10Gbit/s serial CML electrical data into serial optical data compliant with the 10GBASELR standard.   An open collector compatible Transmit Disable (TxDis) is provided.  A logic “1,” or no connection on this pin will disable the laser from transmitting.  A logic  “0” on this  pin  provides  normal  operation.   The  transmitter  has  an  internal  automatic power control loop (APC) to ensure constant optical power output across supply voltage and temperature  variations.   An  open  collector  compatible  Transmit  Fault  (TFault) is  provided. TXFault is a module output contact that when high, indicates that the module transmitter has detected a fault condition related to laser operation or safety.  The TXFault output contact is an open drain/collector and shall be pulled up to the VccHost in the host with a resistor in the range 4.7-10 kΩ .   TXDisable is a module input contact. When TXDisable is asserted high or left open, the SFP+ module transmitter output shall be turned off. This contact shall be pulled up to VccT with a 4.7 kΩ to 10 kΩ resistor
The receiver converts 10Gbit/s serial optical data into serial PECL/CML electrical data.An open collector compatible Loss of Signal is provided.  RxLOS when high indicates an optical signal level below that specified in the relevant standard.   The  RxLOS contact  is an open drain/collector output and shall be pulled up to VccHost in the host with a resistor in the range 4.7-10 kΩ, or with an active termination.   Power supply filtering is recommended for both the transmitter and receiver.    The  RxLOS signal  is  intended as a preliminary indication to the system in which the SFP+ is installed that the received signal strength is below the specified range. Such an indication typically points to non-installed cables, broken cables, or a disabled, failing or a powered off transmitter at the far end of the cable.

Features
● 10Gb/s serial optical interface compliant to 802.3ae 10GBASE-LR
● Electrical interface compliant to SFF-8431 specifications for enhanced 8.5 and 10 Gigabit small form factor pluggable module “SFP+”
● CWDM DFB transmitter, PIN photo-detector
● 2-wire interface for management specifications compliant with SFF 8472 digital diagnostic monitoring interface for optical transceivers
● Operating case temperature: 0 to 70 °C or-40 to 85 °C
● ll-metal housing for superior EMI performance
● Low power consumption
● Advanced firmware allow customer system encryption information to be stored in transceiver
● Cost effective SFP+ solution, enables higher port densities and greater bandwidth
● RoHS compliant

Applications
● High-speed storage area networks
● Computer cluster cross-connect
● Custom high-speed data pipes

ABSOLUTE MAXIMUM RATING
These values represent the damage threshold of the module.   Stress in excess of any of the individual  Absolute  Maximum  Ratings  can  cause   immediate  catastrophic  damage  to  the module even if all other parameters are within Recommended Operating Conditions.

Table 1: Absolute Maximum Rating

RECOMMENDED OPERATING ENVIRONMENT
Recommended Operating Environment specifies parameters for which the electrical and optical characteristics hold unless otherwise noted.

Table 2: Recommended Operating Environment

7. OPTICAL CHARACTERISTICS
The following optical characteristics are defined over the Recommended Operating Environment unless otherwise specified.

Table 3: Optical Characteristics

Notes:
1.   Average optical power shall be measured using the methods specified in TIA/EIA-455-95.
2.   Power budget is defined as the different between the Rx sensitivity and the Tx output power of the interface.
3.   Path  penalty  is intended as the power penalty of the interface between back-to-back and the maximum applied dispersion.

ELECTRICAL CHARACTERISTICS
The following electrical characteristics are defined  over the Recommended Operating Environment unless otherwise specified.

Table 4: Electrical Characteristics

MECHANICAL
Comply to SFF-8432  rev. 5.0, the improved Pluggable form factor specification.

Table 10: Key Mechanical Dimensions

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