![]() ![]() These are not only bulky but also expensive and tend to introduce high optical losses. Richardson, “ First demonstration and detailed characterization of a multimode amplifier for space division multiplexed transmission systems,” Opt. de Waardt, “ 73.7 Tb/s (96 × 3 × 256-Gb/s) mode division multiplexed DP-16QAM transmission with inline MM-EDFA,” Opt. Lingle, “ Mode-division multiplexing over 96 km of few-mode fiber using coherent 6 × 6 MIMO processing,” J. Unlike widely used single-mode fiber systems, however, the essential components needed to build SDM systems or optical fiber sensor systems based on SDM fibers are still not commercially available and the basic prototype systems used in many experiments to date have been implemented only with the aid of bulky free-space optical components. More recently, SDM technologies are being investigated for many other applications such as (i) submarine networks to increase both single fiber capacity and energy efficiency, (ii) datacenter networks to reduce cable count and complexity whilst increasing data bandwidth, and (iii) optical fiber sensor systems to enable long distance distributed sensing or 3-dimensional shape sensing. utilizing few-mode fibers or multicore fibers (MCFs) supporting multiple spatial channels is currently under intense investigation as an efficient approach to overcome the current capacity limitations of high-speed long-haul transmission systems based on single mode optical fibers. Matsuo, “ Multicore fiber technology,” J. Winzer, “ Making spatial multiplexing a reality,” Nat. Nelson, “ Space-division multiplexing in optical fibres,” Nat. Therefore, optical isolators play an important role in optical fiber communication, optical information processing system, optical fiber sensing and precision optical measurement system.Space division multiplexing (SDM) 1–3 1. The power loss caused by Brillouin scattering can be reduced by installing optical isolators at intervals in coherent optical long distance optical fiber communication systems. Without optical isolator, backward-reflected light will enter the signal source (laser), causing violent fluctuations in the signal source. Installing optical isolators at both ends of doped fiber in fiber amplifier can improve the working stability of fiber amplifier. In high-speed direct modulation and direct detection optical fiber communication system, additional noise will be generated by backward transmission of light, degrading the system performance, which needs optical isolator to eliminate. The function of optical isolator is to prevent the bad influence of the backward-transmitted light on the light source and the optical system caused by various reasons.įor example, by installing an optical isolator between semiconductor laser source and optical transmission system will greatly reduce the adverse effect of reflected light on the stability of the spectral output power of the light source. The light reflected through optical fiber echo can be well isolated by the optical isolator, improving the transmission efficiency of light wave. Its function is to limit the direction of light, so that light can only be transmitted in single direction. An optical isolator is a passive device that allows light to pass in one direction and prevents light from passing in the opposite direction. ![]()
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