Below you can find what I have managed to complie to be the companies involved in Optical communications. Let me know if I've missed any tickers:
|Layer|Category|Ticker|Company Name|
|:-|:-|:-|:-|
|IC Design & Manufacturing|ASIC & xPU Design|NVDA|NVIDIA|
|IC Design & Manufacturing|ASIC & xPU Design|MRVL|Marvell|
|IC Design & Manufacturing|ASIC & xPU Design|AVGO|Broadcom|
|IC Design & Manufacturing|ASIC & xPU Design|INTC|Intel|
|IC Design & Manufacturing|ASIC & xPU Design|AMD|Advanced Micro Devices|
|IC Design & Manufacturing|ASIC & xPU Design|CSCO|Cisco|
|IC Design & Manufacturing|Photonic IC Design|NVDA|NVIDIA|
|IC Design & Manufacturing|Photonic IC Design|MRVL|Marvell|
|IC Design & Manufacturing|Photonic IC Design|AVGO|Broadcom|
|IC Design & Manufacturing|Photonic IC Design|LITE|Lumentum|
|IC Design & Manufacturing|Photonic IC Design|COHR|Coherent|
|IC Design & Manufacturing|Electronic IC|NVDA|NVIDIA|
|IC Design & Manufacturing|Electronic IC|MRVL|Marvell|
|IC Design & Manufacturing|Electronic IC|LITE|Lumentum|
|IC Design & Manufacturing|Electronic IC|COHR|Coherent|
|IC Design & Manufacturing|Electronic IC|MTSI|MACOM Technology Solutions|
|IC Design & Manufacturing|Wafer Foundry|TSM|TSMC|
|IC Design & Manufacturing|Wafer Foundry|TSEM|Tower Semiconductor|
|IC Design & Manufacturing|Wafer Foundry|GFS|GlobalFoundries|
|IC Design & Manufacturing|Wafer Foundry|UMC|UMC|
|||||
|Materials|InP Substrate|AXTI|AXT Inc|
|Materials|InP Substrate|5016|JX Metals|
|Materials|InP Substrate|5802|Sumitomo Electric Industries|
|Materials|InP Epitaxial Wafer|IQE|IQE|
|Materials|InP Epitaxial Wafer|5802|Sumitomo Electric Industries|
|Materials|GaAs Substrate|AXTI|AXT Inc|
|Materials|GaAs Substrate|5802|Sumitomo Electric Industries|
|Materials|Copper Foil|5706|Mitsui Kinzoku|
|Materials|Copper Foil|5801|Furukawa Electric|
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|Optical Components|Laser/Light Source (VCSEL)|LITE|Lumentum|
|Optical Components|Laser/Light Source (VCSEL)|COHR|Coherent|
|Optical Components|Laser/Light Source (VCSEL)|AVGO|Broadcom|
|Optical Components|Laser/Light Source (VCSEL)|AAOI|Applied Optoelectronics|
|Optical Components|Laser/Light Source (VCSEL)|5802|Sumitomo Electric Industries|
|Optical Components|Laser/Light Source (VCSEL)|5801|Furukawa Electric|
|Optical Components|Laser/Light Source (VCSEL)|6503|Mitsubishi Electric|
|Optical Components|Laser/Light Source (EML)|LITE|Lumentum|
|Optical Components|Laser/Light Source (EML)|COHR|Coherent|
|Optical Components|Laser/Light Source (EML)|AVGO|Broadcom|
|Optical Components|Laser/Light Source (EML)|5802|Sumitomo Electric Industries|
|Optical Components|Laser/Light Source (EML)|5801|Furukawa Electric|
|Optical Components|Laser/Light Source (EML)|6503|Mitsubishi Electric|
|Optical Components|Optical Module Assembly & Integration|COHR|Coherent|
|Optical Components|Optical Module Assembly & Integration|LITE|Lumentum|
|Optical Components|Optical Module Assembly & Integration|CSCO|Cisco|
|Optical Components|Optical Module Assembly & Integration|MRVL|Marvell|
|Optical Components|Optical Module Assembly & Integration|FN|Fabrinet|
|Optical Components|Optical Module Assembly & Integration|NOK|Nokia|
|Optical Components|Optical Module Assembly & Integration|6166|Cambridge Industries|
|Optical Components|Fiber Array Unit|5802|Sumitomo Electric Industries|
|Optical Components|MPO Connector|GLW|Corning|
|Optical Components|MPO Connector|APH|Amphenol|
|Optical Components|MPO Connector|5802|Sumitomo Electric Industries|
|Optical Components|MPO Connector|5803|Fujikura|
|Optical Components|Coupler/Splitter|LITE|Lumentum|
|Optical Components|Coupler/Splitter|COHR|Coherent|
|Optical Components|Filter|LITE|Lumentum|
|Optical Components|Filter|COHR|Coherent|
|Optical Components|Filter|VIAV|Viavi Solutions|
|Optical Components|Filter|5802|Sumitomo Electric Industries|
|Optical Components|VSFF Connector|GLW|Corning|
|Optical Components|VSFF Connector|APH|Amphenol|
|Optical Components|VSFF Connector|5802|Sumitomo Electric Industries|
|Optical Components|VSFF Connector|5803|Fujikura|
|Optical Components|Wavelength Division Multiplexer|LITE|Lumentum|
|Optical Components|Wavelength Division Multiplexer|CIEN|Ciena|
|Optical Components|Optical Fiber|GLW|Corning|
|Optical Components|Optical Fiber|5801|Furukawa Electric|
|Optical Components|Optical Fiber|5802|Sumitomo Electric Industries|
|Optical Components|Optical Fiber|5803|Fujikura|
|Optical Components|Optical Fiber|6869|Yangtze Optical Fibre and Cable|
|Optical Components|Attenuator|LITE|Lumentum|
|Optical Components|MT Ferrule|5801|Furukawa Electric|
|Optical Components|MT Ferrule|5802|Sumitomo Electric Industries|
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|Packaging & Testing|Packaging & Testing Services|ASX|ASE Group|
|Packaging & Testing|Packaging & Testing Services|AMKR|Amkor Technology|
|Packaging & Testing|Packaging & Testing Services|FN|Fabrinet|
|Packaging & Testing|Packaging & Testing Services|JBL|Jabil|
|Packaging & Testing|Packaging Equipment|KLIC|Kulicke & Soffa|
|Packaging & Testing|Packaging Equipment|ASMPT|ASM Pacific Technology|
|Packaging & Testing|Packaging Equipment|6340|Shibuya Corporation|
|Packaging & Testing|Test Equipment|TER|Teradyne|
|Packaging & Testing|Test Equipment|KEYS|Keysight Technologies|
|Packaging & Testing|Test Equipment|FORM|FormFactor|
|Packaging & Testing|Test Equipment|ATEYY|Advantest (ADR)|
|Packaging & Testing|Test Equipment|8035|Tokyo Electron|