MODE CHARACTERISTIC COMPENSATOR, MULTIMODE AMPLIFICATION SYSTEM, AND MODE MULTIPLEX TRANSMISSION SYSTEM

• Main Authors: MORI TAKAYOSHI, SAITO KUNIMASA, FUJISAWA TAKESHI, IMADA RYOTA, NAKAJIMA KAZUHIDE, SAKAMOTO YASUSHI, SATO TAKANORI
• Format: Patent
• Language: English; Japanese
• Published: 27.10.2022
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSMISSION

To enable an intensity difference between modes to be compensated, even for four or more modes.SOLUTION: A mode characteristic compensator provided with a mode multiplex-demultiplex function for multiplexing four or more basic modes to a main waveguide in mutually different modes and demultiplexing the four or more modes of the main waveguide for each mode in the basic modes. includes a coupler for coupling basic modes propagating the main waveguide and a non-contact parallel waveguide to a higher order mode of the main waveguide and causing mode conversion to occur between itself and the main waveguide. Each of the couplers includes a plurality of coupling parts, and a delay-amount variable delay part for causing a propagation delay to occur between the parallel waveguide and the main waveguide. The delay amount of the delay part included with the coupler is predetermined so that the intensity difference between the modes outputted from the main waveguide is smaller than the intensity difference between the basic modes.SELECTED DRAWING: Figure 1 【課題】本開示は、４モード以上であっても、モード間の強度差を補償可能にすることを目的とする。【解決手段】本開示は、４以上の基本モードを互いに異なるモードで主導波路に合波し、前記主導波路の４以上のモードをモードごとに基本モードで分波するモード合分波機能を備えるモード特性補償器であって、前記主導波路と非接触の平行導波路を伝搬する基本モードを前記主導波路の高次モードに結合させ、前記主導波路との間でモード変換を発生させるカプラーを備え、前記カプラーは、それぞれ、複数の結合部と、前記主導波路との間で伝搬遅延差を生じさせる、遅延量の可変な遅延部と、を備え、前記主導波路から出力されるモード間の強度差が各基本モードの強度差よりも小さくなるように、前記カプラーに備わる遅延部の遅延量が定められている、モード特性補償器である。【選択図】図１