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Optical communications

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
398043000 MULTIPLEX 2154
398009000 DIAGNOSTIC TESTING 999
398140000 TRANSMITTER AND RECEIVER SYSTEM 526
398182000 TRANSMITTER 405
398202000 RECEIVER 327
398135000 OPTICAL TRANSCEIVER 307
398115000 HYBRID COMMUNICATION SYSTEM (E.G., OPTICAL AND RF) 277
398001000 FAULT RECOVERY 243
398118000 OPTICAL COMMUNICATION OVER FREEE SPACE 174
398106000 REMOTE CONTROL 92
398041000 DUPLEX 31
398173000 OPTICAL REPEATER SYSTEM 30
398104000 UNDERWATER 17
398132000 PHOTOPHONE 10
398039000 INTERFERENCE SIGNAL TRANSMISSION OR ELIMINATION (E.G., JAMMING OR ANTIJAMMING) 10
398040000 EAVESDROPPING 4
20090148159Method and Apparatus for Securing Fiber in an Optical Network - A method and apparatus for securing an optical communication link includes the step of identifying a profile of the link by measuring, at the transmitter, optical back-reflections from optical pulses forwarded to a receiver. The profile is stored at the transmitter. Periodically during operation, such as during key exchange, more optical pulses are forwarded to the receiver, and the back reflections are collected as periodic profiles. The periodic profiles are compared against the stored profiles. Eavesdroppers, such as those who cut the fiber, tap the fiber, or implement a man in the middle attack, may be easily identified because the losses caused by their interference with the fiber will be evident in the periodic profiles.06-11-2009
20110019997System for intercepting signals to be transmitted over a fiber optic network and associated method - A system is provided for intercepting signals transmitted between a target served by a fiber optic network and a subscriber. A network is described having a phone switch at a central office configured to receive signals for transmission to and from a target, such as the target of a criminal investigation. A signal received at the central office is assigned to an analog circuit, and a monitoring device configured to intercept and monitor the signal is installed along the analog circuit at a location that allows the monitoring of communications without notifying the target that he is under surveillance. After the signal has been monitored, it is converted to a digital signal for transmission. A method is also provided for intercepting a signal transmitted between the target served by a fiber optic network and a subscriber, such that a monitoring device may be installed without alerting the target.01-27-2011
20120121260SYSTEM FOR INTERCEPTING SIGNALS TO BE TRANSMITTED OVER A FIBER OPTIC NETWORK AND ASSOCIATED METHOD - A system is provided for intercepting signals transmitted between a target served by a fiber optic network and a subscriber. A network is described having a phone switch at a central office configured to receive signals for transmission to and from a target, such as the target of a criminal investigation. A signal received at the central office is assigned to an analog circuit, and a monitoring device configured to intercept and monitor the signal is installed along the analog circuit at a location that allows the monitoring of communications without notifying the target that he is under surveillance. After the signal has been monitored, it is converted to a digital signal for transmission. A method is also provided for intercepting a signal transmitted between the target served by a fiber optic network and a subscriber, such that a monitoring device may be installed without alerting the target.05-17-2012
20080298802OPTICAL SIGNAL MEASUREMENT DEVICE - A device connects to a male network connector of a network conduit, and connects to a female network connector of the network conduit. The female network connector is capable of communicating with the male network connector. The device also measures outputs of the male network connector and the female network connector.12-04-2008

Patent applications in all subclasses Optical communications