Application of PSM4 Technology in Transceivers
PSM4 is short for the 4 x 25Gbps parallel single mode technology which is proposed
as a PHY solution for the 500m single mode objective. It is generally used in
the transceiver application. With this technology, optical transceivers come
to have the following features.
1. Surface mount with passive alignment enables enables low cost module.
2. Use of lens-integrated optical devices reduces components and assembly costs
in transceiver design.
The mainly transceiver that uses PSM4 is the 40G QSFP+. QSFP+, short for quad small form-factor pluggable plus, is designed for high-density applications. Except the 40G QSFP+ transceiver modules, FiberStore also supplies QSFP+ cables including the active optical cable (AOC), passive copper cable assembly, active copper cable assembly, and QSFP+ loopback.
The SFF-8685 document specifies a transceiver mechanical form factor with latching mechanism, host-board electrical-edge connector and cage. The hot-pluggable transceiver integrates 4 transmit and 4 receive channels. Our QSFP+ transceiver can replace up to 4 standard SFP+ transceivers. The result is greater port density and overall system cost savings over traditional Plus SFP module. Our QSFP+ cable assemblies are designed to accommodate stacked and ganged connector configurations in extremely high-density requirements. This system supports 10G Ethernet, Fibre Channel, InfiniBand, SAS and SONET/SDH standards with different data rate options.
AOCs, short for active optical cables, have extremely low power consumption of
only 0.78W per cable end. This feature improves overall data center power consumption
and thermal efficiency.
40G QSFP+ PSM4 AOCs
use single mode silicon photonics (SiPh) to enable transmitting up to 4km on
single mode ribbon fiber.
AOCs reduced cable bulk compared to larger diameter copper cabling enable deployment of additional ports for increased number of AOCs per system, resulting in more connectivity options and total system cost savings. QSFP+ loopback features a compact housing compatible with module spacing and loop optical transmit ports to receive ports for testing, burn-in and field troubleshooting.