How 10G SFP+ SR Transceiver Works

The 10G SFP+ SR is a high-speed, low-latency, high-density, and cost-effective fiber optic data transmission solution that delivers up to 10.2 Gbps of aggregate bandwidth.

It provides a link length of up to 300 meters over OM3 multimode fiber(MMF), and 400 meters over OM4 multimode fiber.

The SFP-10G-SR is designed for use in data center applications and other demanding environments where high capacity and low latency are required.

10G SFP + SR module principle

10G SFP+ SR Working Principle

10Gbps SFP + SR module is a miniaturized hot-pluggable module integrating optical transceivers.

Its 10Gbps high-speed optical interface and 10Gbps high-speed serial electrical interface provide optical/electrical and electrical/optical conversion interfaces between the optical physical layer and the electrical section layer.

The new standard reduces costs by moving everything except optical fiber to the outside of the module, including signal modulation function, serial/deserializer, MAC, clock and data recovery circuit, and electronic dispersion compensation (EDC) function.

After such processing, a simplified optical transceiver module with electro-optic / photoelectric conversion polarization mode dispersion (PMD) function is obtained.

The electrical interface adopts a 20pin gold finger connection mode, and sff-8431 is specified as SFI high-speed electrical signal interface, which is used to input and output data signals, status, and control signals.

The data signals Rd + / – and TD + / – are CML level, and the status output and control signal input are LVTTL level.

Tosa (optical transmitting subsystem) and Rosa (optical receiving subsystem) are used for optical interfaces to output and input optical signals.

The transmitting part and receiving part of the SFP-10G-SR module are completely independent.

SFF-431 stipulates that according to the organizational structure of the receiving part, it can be divided into just linear modules, just limiting modules, or both linear and limiting modules.

The 10G SFP + SR optical transceiver module adopts the organizational structure of the single limiting module, and the receiving part integrates Rosa and limiting amplifiers.

The 10 Gbps optical signal is converted into electrical signal output by a pin detector, and then amplified and output through the limiting amplifier of the later stage, which is connected with ASIC / SerDes on the backplane to complete optical/electrical conversion.

The transmitting part integrates Tosa, laser driver, and control circuit. The 10Gbps high-speed electrical signal is input through the SFI electrical interface.

After the driver drives the laser to emit light, the electrical/optical conversion is completed.

The control circuit part realizes the intelligent control of the automatic power control (APC), extinction ratio compensation, the soft shutdown of the transmitting part, and bandwidth adjustment of the receiving part of the laser through the internal communication interface.

It can communicate with the host computer through the external communication interface to report the relevant working status of the module.

The basic principle block diagram of the 10G SFP + SR module is shown in the figure below.

10G SFP + SR module architecture
How SFP-10G-SR Works


The above-mentioned has introduced what is 10G SFP+ SR transceiver, its application, and how it works.

If you are finding 10G SFP+ SR transceivers at a reasonable price, you can visit QSFPTEK website or contact the sales via email [email protected].