223880 ⎘
Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication; Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form Bidirectional amplification
Sub-classes:OPTICAL AMPLIFICATION APPARATUS, OPTICAL TRANSMISSION SYSTEM, AND OPTICAL AMPLIFICATION METHOD
#2FIBER OPTIC CABLE POWER IN REPEATERED SYSTEMS
#3OPTICAL RELAY DEVICE AND SIGNAL TRANSMISSION SYSTEM
#4MONITORING SIGNAL LIGHT OUTPUT APPARATUS, SUBMARINE APPARATUS, AND OPTICAL COMMUNICATION SYSTEM
#5TERRESTRIAL REPEATER AND OPTIMIZED REPEATER SPACING
#6Optically amplified repeater system and optical amplifier
#7Optical DWDM data and QKD transmission system
#8Symmetrical supervisory optical circuit for a bidirectional optical repeater
#9Forty channel optical communications module link extender related systems and methods
#10Supervisory signal paths for an optical transport system
#11Signal loopback circuit and signal loopback method
#12Dynamic control and modification of coaxial tap directionality
#13Fiber-to-the-premise optical communication system