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.