Since the 40G Ethernet standard was proposed in 2010, QSFP + optical transceivers have begun to dominate in 40G Ethernet applications. The two basic interface specifications of QSFP + optical transceivers are 40GBASE-LR4 and 40GBASE-SR4, 40GBASE-LR4 is used in single-mode applications, and 40GBASE-SR4 is utilized in multi-mode applications.

Package type

The 40GBASE-SR4 optical transceiver package type is QSFP +, that is, a four-channel small pluggable optical transceiver. This package type was born to meet the market's demand for higher-density high-speed pluggable solutions. The entire system includes 38PIN connectors, electromagnetic interference (EMI) shielding components, optical transceivers, heat dissipation components, copper cable components, MTP optical cable components, optical loopbacks, etc.

QSFP-40G-SR4 optical transceiver product features

.4 channel full-duplex transceiver

.Transmission rate per channel is 10.5 gbps

.4 channel 850nm VCSEL array

.4 channel PIN photodetector array

.Low power consumption <1.5 w

.Hot plug QSFP package

.OM3 MMF transmission 100 meters and OM4 MMF transmission 150m

.MPO connector socket

.Built-in digital diagnosis function

.Operating temperature 0 ° C + 70 ° C

.3.3 v supply voltage

.Complies with RoHS6

The working principle of QSFP-40G-SR4 optical transceiver

When the QSFP-40G-SR4 optical transceiver transmits signals at the sending end, the electrical signals are first converted into optical signals by the laser array. When transmitting signals at the transmitting end, and when receiving signals at the getting end, the photodetector array converts the parallel optical signals into parallel electric signal.

The transmission principle of QSFP-40G-SR4 optical transceiver

The QSFP-40G-SR4 optical transceiver is transmitted through four channels. The electrical signal is first changed into an optical signal through the laser array, and then the photodetector array converts the parallel optical signal into a parallel electrical signal, which is usually then used together with the MTP / MPO connector , To achieve 40G optical connection.

QSFP-40G-SR4 optical transceiver application

QSFP-40G-SR4 optical transceiver adopts MTP / MPO interface, the working wavelength is 850nm, generally used in multimode applications. When it is used with OM3 / OM4 multimode fiber , the transmission distance is 100m and 150m respectively, which is mainly used to realize the connection between network devices in the data center. The QSFP-40G-SR4 optical transceiver can not only use MTP / MPO fiber jumpers to connect two 40G network devices, but also can be used with MTP / MPO to LC fiber jumpers to understand the bond between 40G network devices and 10G network devices connection.