Showing papers on "Optical Transport Network published in 1984"

Architectural considerations involved in the design of an optical digital computer

Abstract: Communication problems such as interconnection bandwidth, clock skew, and connectivity restrict computational throughput. Bandwidth and clock skew problems limit the speed and add to the design complexity. Constrained connectivity forces a significant portion of the speed of a processor to be used to compensate for the limited number of interconnections. Philosophically, the large bandwidth, innate parallelism, and noninterfering propagation of optics offer mechanisms for overcoming these communication problems. The difficulty in exploiting these capabilities has been the absence of suitable optical logic and memory devices. Technologically, optical bistability and other advances in electrooptics now offer the possibility of cascadable optical logic elements with speed and power dissipation comparable with electronics. Architecturally, a parallel pipelined structure can be used to simplify the optical memory requirements as well as exploit the communication capabilities of optics.

Optical cascade star network - A new configuration for a passive distribution system with optical collision detection capability

Abstract: A new fiber-optic passive network configuration with novel star couplers is reported. The new optical network configuration, an Optical Cascade Star Network, optimizes contradictory requirements for network system size and cable cost, and matches the actual layout in offices or factories. The star coupler is novel in that the optical signal does not return to the source terminals. This feature enables cascade connection of star networks, the use of simple repeaters for system extension, and the easy support of carrier sense multiple access with collision detection (CSMA/CD) bus access procedure. Experimental results obtained from novel star couplers, optical transceivers with (CSMA/CD) bus compatibility, and a total network system are also discussed.

Line signals in submarine digital telephone links using optical fibers

Abstract: Different kinds of digital signals can be used on optical submarine systems. In this paper, different solutions are given and discussed with respect to: codes and spectrum on line, scrambling patterns, frames, and sensibility against error bursts. It is shown that all these parameters have to be considered for the transmission quality.

Dialogue channels used for remote supervision and remote control of underwater plant in submarine digital telephone links using optical fibers

Abstract: In this paper, the need for supervisory on optical submarine systems is discussed. The requirements are presented in respect to the different means or channels which are available. A summary of supervisory systems which are currently used all over the world is given along with some additional comments.

Optical fiber communications link design in compliance with systems performance standards

Abstract: An engineering approach to the design of optical fiber communication links to meet mandated specifications for performance and interoperability is described. The report follows and expands upon technical guidance originally developed for MIL-STD-188-111, Subsystem Design and Engineering Standards for Common Long Haul and Tactical Fiber Optics Communications. The engineering approach should be useful in the implementation of other Government and voluntary standards under development.

Multiplexeurs Multiples a reseau Unique

Abstract: We show that several independant multiplexers can be grouped together in the same optical component. The multiplexing function is completed by a simple common optical element. These components called shared optical function components allow the reducing of the wavelength multiplexing cost.© (1984) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.