As receiver or light detector SFP-10G-SR modules use PIN photodiode, which is relatively cheap but with rather low sensitivity, if compared with another type of photodetectors used in long-range transceivers – APD (avalanche photodiode). VCSEL’s on SFP-10G-SR transceivers use 850nm as center wavelength and occupy 20nm (840-860nm) spectrum. Briefly – VCSEL lasers main advantage is low cost and simple production process, but VCSEL can emit only relatively wide beam of light, therefore it is adaptable only with multi-mode fiber.

SFP-10G-SR Transceivers use VCSEL (Vertical-Cavity Surface-Emitting Laser) laser diode as light emitter. Laser or photonic components are most expensive items on every optical transceiver BOM and price of these components are key price drivers of whole transceiver. Transmission power and receiver sensitivity define optical budget and as a result maximum distance. Optical properties define such key factors as transceivers operational center wavelength and its bandwidth, compatible optical cable type. Every optical transceiver we can characterize by three groups of its properties – optical, electrical and environmental.

SFP-10G-SR is optical transceiver based on widely used SFP+ (Small Form-Factor Pluggable) MSA Standard.

We will try to clarify some of them based on most popular doubts or questions our customers have expressed. Because of such wide adoption of SFP+ short-range modules by thousands of enterprises, Telco’s and data centers it is typical, that many uncertain concepts and myths arise. Indeed, we even saw some market reports stating that SFP-10G-SR optics occupy about 25% of 10GbE ports shipped worldwide. Definitely, 40G and 100G optical transceivers are becoming increasingly popular, but because of stable technology (first SFP+ modules arrived in market already by 2006) and it’s reduced pricing SFP-10G-SR is dominant choice for short range optical connections. 1 Like SFP-10G-SR nowadays in 2017 is industry leading mainstream optical module in terms of quantity used.

Topper sfp transceiver