BF4M Optical Active Connectors Hirose Electric BF4M Optical Active Connectors feature an innovative design that enables electromagnetic noise-free, insulated, long-distance, high-speed transmission. These connectors are also ideal for optical transmission between boards incorporated in devices. The highly flexible, optical fiber allows for tight bend radiuses when used in small devices. The BF4M series simplifies and reduces system design time by providing high-speed, signal transmissions with no EMI noise. Hirose Electric BF4M Optical Active Connectors offer low power consumption in a space-saving, low-profile design with 1.5mm height. Applications include medical appliances, measurement equipment, and FA systems.