89114349 fiber loses
89114390 optical recievers and optical aplifiers
89114394 multi channel system in optical communication
89125356 fiber optic testing
89125365 fiber inspection & cleaning
90114301 fusion splicer, OTDR
90114306 optical fault locator mechanism
90114309 dispersion in single mode and multimode optical fiber
90114321 optical noise and sources of noise in optical systems
90114337 coherent optical systems
90125319 fiber loses
90125324 optical recievers and optical aplifiers
90125329 multi channel system in optical communication
90125344 fiber optic testing
90125350 fiber inspection & cleaning
90125355 fusion splicer, OTDR
90125356 optical fault locator mechanism
91214001 dispersion in single mode and multimode optical fiber