Unidirectional Optical Connector System

April 10, 2018
Hirose's connectors dramatically reduces the required PCB mounting space.

The BF4M optical connector system converts a balanced high-speed differential electrical signal on a PCB at one end into a MM optical signal for transmission down a very thin flexible FO cable, and then converts it back into an electrical signal on the other end. The BF4M Series is designed as a separate plug and receptacle that solders to the PCB to eliminate the thermal issues associated with soldering the E/O and O/E devices directly to the PCB.


Designed with an ultra-low profile and space-saving receptacle, the BF4M Series optical interconnects support high speed isolated signal transmission from 0.05Gbps up to 6.25Gbps and long distance transmission up to 100 m. The user-friendly optical connector features an innovative internal wiring system that offers all the benefits of fiber optic signaling including high signal quality, low power consumption (less than 120nW), and excellent EMI noise prevention. The BF4M uses high flex fiber optic cable capable of withstanding significant bending cycles tested at a 2 mm bending radius.


While designed for factory automation and medical industries, the lightweight optical connector system is an ideal solution for any application that requires long reach, high speed and limited wiring space.


The BF4M Series receptacle has a height of only 1.5 mm, 11.5 mm long, and 5.5 mm wide.

Connector TypePlug, ReceptacleCable AssemblyYesMating/Unmating Cycles50Fiber MaterialSilica glassOperating Temperature (Max.)60?Operating Temperature (Min.)-10?



  • Optical transmissions achieved by simplified electrical connections
  • High-speed, signal transmissions with no EMI noise
  • Highly flexible optical fibers
  • Long-distance, high-speed and high quality signal transmissions
  • Low power consumption
  • Space-saving and low profile design with 1.5 mm height