Modifiers matching coupler:

• mechanical,
• directional,
• optical,

Simple categories matching optical:

• assembly,
• property,
• observation,
• feature,
• instrument,
• material,
• force,
• part,
• quality,
• component,
• consideration,
• system,
• elements,
• waveguide,
• disease,
• measurement,
• radiation,
• device,
• texture,
• instrumentation,
• performance,
• data,
• catalyst,
• drive,
• application,
• equipment,
• marker,
• defect,
• error,
• communications,
• interference,
• surface,
• display,
• medium,
• figure,
• paraphernalia,
• devices,
• element,
• coupling,
• coating,
• aberration,
• distortion,
• resin,
• processing,
• reader,
• wave,
• function,
• attribute,
• command,
• perturbation,
• disorder,
• sensation,
• constant,
• block,
• effect,
• unit,
• interferometer,
• switch,
• fibre,
• penalty,
• fiber,
• pathology,
• quantity,
• imperfection,
• communication,
• coupler,
• process,
• irregularity,
• glass,
• windows,
• market,
• case,
• point,
• lense,
• lens,
• phenomenon,
• means,
• appliance,
• transformation,
• circuit,
• characteristic,
• layer,
• filter,
• munition,
• measure,
• state,
• apparatus,
• glasses,
• network,
• deflector,
• value,
• solution,
• sheet,
• object,
• base,
• artifact,
• structure,
• substance,
• disk,
• image,
• indicator,
• sensor,
• dielectric,
• section,
• impression,
• field,
• input,
• portion,
• signaling,
• interaction,
• procedure,
• entity,
• amplifier,
• correction,
• film,
• information,
• parameter,
• power,
• crystal,
• particle,
• implementation,
• detector,
• mode,
• pattern,
• hardware,
• reflector,
• scopes,
• shutter,
• disc,
• machine,
• condition,
• activity,
• article,
• product,
• energy,
• item,
• plate,
• module,
• magazine,
• contrivance,
• carrier,
• details,
• substrate,
• experiment,
• losses,
• concept,