Showing papers on "Optical Carrier transmission rates published in 1989"

Optical communication by injection-locking to a signal which modulates an optical carrier

Abstract: An optical communication system is disclosed including an all-optical device whose output modulated optical beam is locked to an input modulated optical beam. In a specific embodiment of the system, the device may be a self-electro-optic effect device (SEED), which is operated as an oscillator by means of an associated tank circuit. Such an embodiment permits recovery of a clock frequency from a bit stream which is input into the device. When the output of the device is directed into an optical decision element, an all-optical regenerator may be realized.

Analog High-Bandwidth Single-Shot Data Link Using Integrated Optical Modulators And A High Fidelity Optical Streak Camera

Abstract: We present preliminary data on the fidelity of an analog optical data link operating at 830 nm. This data link encodes an electrical signal on an optical carrier by the action of a commercially available integrated-optic modulator, a 2x2 switch, from Crystal Technology, Inc. (CTI). An optical streak camera is used to record the modulated optical carrier. With this single-shot system a precision of 2--5% is realized. The dynamic range of the system is approximately 30 dB (power). The present system bandwidth is limited to 3 Ghz by the CTI modulator. New modulator designs using travelling wave structures will soon extend the system bandwidth to around 10 Ghz. We discuss the potential for development of a high-fidelity multichannel analog link based upon this technology and the potential impact on instrumentation for the measurement of ultra-fast single-transient phenomena. 5 refs., 10 figs.

Semiconductor Laser Transmitters

Abstract: The conversion of a low-level electrical signal (e.g., ECL or TTL for a digital application, or ∼ 1 V for an analog application) to a corresponding light-intensity envelope in the time domain is accomplished at the transmitter. Such direct modulation is intended to affect only the average optical power, and any phase or frequency information imparted to the optical carrier frequency itself is not used at the receiver. Important increases in receiver sensitivity and selectivity can be derived using intentional optical phase or frequency modulation. Such “coherent” transmission is dealt with in Chapter 25.

Radio frequency generator

Abstract: An airbourne decoy arrangement e.g. for deployment for an aircraft comprises a mode linked semiconductor laser 11 whereby an optical carrier modulated with a radio frequency signal is generated and transmitted via an optical fibre link 13 to a decoy target 12, where the modulation is recoverved from the carrier and broadcast via antenna 14.

An experimental optical fiber local area network

Abstract: The design and implementation of an experimental local area network (LAN) using optical fiber as the transmission medium are presented. Carrier sense multiple access with collision detection (CSMA/CD) protocol based on the IEEE 802.3 standards is adopted for the system design, and the LAN interface cards for PC networking are built with VLSI processor chips. Certain CD techniques suitable for the optical fiber medium are explored. >