HFCT-5305

Gigabit Ethernet: 1.25 GBd 1300 nm Laser Transceiver in Low Cost 1 x 9 Package Style Preliminary Technical Data HFCT-5305 Features Compliant with Proposed Specifications for IEEE802-3 Gigabit Ethernet 1300 nm Trenched BH Laser Source Technology Industry Standard 1 x 9 Package Style with Integral Duplex SC Connector Class 1 Laser Safety (Certification Pending) 3 km Links in 8/125 µm SMF Cables 550 m Links in 62.5/125 µm MMF Cables Single +5 V Power Supply Operation and PECL Logic Interfaces Wave Solder and Aqueous Wash Process Compatible Designed and Manufactured in an ISO 9000 Certified Facility Description General Transmitter Section The transmitter section consists of a 1300 nm Laser in an eye safe optical subassembly, (ELSA), which mates to the fiber cable. The ELSA is driven by a custom silicon bipolar IC which converts differential PECL logic signals, ECL referenced to a +5 V supply, into an analog Laser Diode drive current. Eye Safety Design The ELSA is designed to be eye safe under a single fault condition. To be eye-safe, only one of two results can occur in the event of a single fault. The transmitter must either maintain a safe level of output power or the transmitter should be disabled. The ELSA contains a patented optical fiber stub which restricts the level of light emerging from the connector port under all conditions. Overdriving the laser (even to destruction) cannot produce enough light to violate the IEC safe level. As a result the HFCT-5...