Single Optical Switch Research Articles

ALL-OPTICAL N-BIT BINARY TO TWO’S COMPLEMENT CONVERTER WITH THE HELP OF SEMICONDUCTOR OPTICAL AMPLIFIER-ASSISTED SAGNAC SWITCH

All-optical n-bit paired to 2’s complement converter has been planned with the assistance of Terahertz optical unbalanced demultiplexer (TOAD) switches. The paper depicts all-optical transformation conspire to utilize a bunch of every single optical switch. PC framework ordinarily utilizes 2’s complement for paired deduction and intelligent control. By embracing a definite mathematical reproduction the impact of these critical boundaries on the measurements that decide the nature of exchange is completely examined and diverse plan rules are extricated for their legitimate determination to guarantee ideal activity.

Full-Duplex Self-Recovery Optical Fibre Transport System Based on a Passive Single-Line Bidirectional Optical Add/Drop Multiplexer

A full-duplex self-recovery optical fibre transport system is proposed on the basis of a novel passive single-line bidirectional optical add/drop multiplexer (SBOADM). This system aims to achieve an access network with low complexity and network protection capability. Polarisation division multiplexing technique, optical double-frequency application and wavelength reuse method are also employed in the transport system to improve wavelength utilisation efficiency and achieve colourless optical network unit. When the network comprises a hybrid tree–ring topology, the downstream signals can be bidirectionally transmitted and the upstream signals can continuously be sent back to the central office in the reverse pathways due to the remarkable routing function of the SBOADM. Thus, no complicated optical multiplexer/de-multiplexer components or massive optical switches are required in the transport system. If a fibre link failure occurs in the ring topology, then the blocked network connections can be recovered by switching only a single optical switch preinstalled in the remote node. Simulation results show that the proposed architecture can recover the network function effectively and provide identical transmission performance to overcome the impact of a breakpoint in the network. The proposed transport system presents remarkable flexibility and convenience in expandability and breakpoint self-recovery.

Wavelength-Routing Capability of Reconfigurable Optical Add/Drop Multiplexers in Dynamic Optical Networks

According to their underlying switching technologies, reconfigurable optical add/drop multiplexers (ROADMs) can be classified into three categories: Category I consists of a single large optical switch; category II is composed of a number of small optical switches aligned in parallel; and category III has a single optical switch and only one wavelength being added/dropped. To evaluate the wavelength-routing capability of ROADMs of various categories in dynamic optical networks, a theoretical routing-power model is developed, taking into account different ROADM architectures and dynamic traffic. Numerical simulations show that different category ROADMs differ considerably in their wavelength-routing capabilities, which are significantly dependent upon dynamic traffic. It is also observed that among these three ROADM architectures, category I (III) ROADMs offer the greatest (lowest) wavelength-routing capability and the lowest (highest) susceptibility to dynamic traffic. In particular, to maximize the ROADM-based network flexibility and connectivity, a set of practically applicable criteria is identified on designing/choosing optimum ROADMs for given dynamic optical networks