Terahertz LTX-7215-1310 - 2 Gbps Analog/Digital Fiber Transceiver

The LTX-7215 “Signal Transporter” Transceivers one analog and four independent channels of digital information over a fiber optic link to over 10 kilometers with Singlemode fiber.

The LTX-7215 Bidirectional Fiber Optic Link multiplexes one analog signal along with up to 4 independent TTL/CMOS/LVTTL digital channels to over 10 kilometers with a single fiber. The incoming analog data is digitized to 12 bit precision at 100 mega samples per second and the digital channels operate at data rates of 0 to 50Mb/s. This is then transmitted at 2 Gb/s second for distances up to 10 kilometers. The digital signal is then received and the analog signal is accurately reproduced at the far end of the fiber optic link.

The analog signal bandwidth may be from DC to 25 MHz (-3dB). The LTX-7215 has input voltage ranges of ±1 Volt or ±5 Volts. The input impedance of the analog channel may be set to 50 ohms or 1 megohm (75 ohms is optional). The LTX7215 series has a battery option that will allow for up to 3 hours of operation for experiments at extremely high potentials. Applications include data acquisition for plasma physics experiments, signal transmission and control of equipment at high voltage potentials, transmission of high quality video, and precise noise-free signal transmission in hostile EMI environments.

The LTX-7215 amplifies, filters and digitizes the input analog signal to 12-bit precision at a 100 MS/S rate. The twelve bit digital data from each sample is combined with the state of the four digital input channels to form a sixteen bit word. This word is converted to an 8b/10b code and transmitted as a twenty bit word. This process is repeated at a 100 MHz rate resulting in a 2 Gb/s data stream. This data is converted to an optical bitstream and transmitted via a user-supplied optical fiber.

The companion unit the optical bitstream and converts it to a digital signal. It then decodes and demultiplexes this data. Twelve bits are presented to a fast D/A converter and post amplifier which drives the analog output port and four bits are latched and presented at the digital output ports. The system is intended for use with singlemode fiber.