A fiber optic assembly for supporting optical connections in a fiber optic network employing parallel optical configurations is described. In one embodiment, the fiber optic assembly includes at least two live multi-fiber components and at least one tap multi-fiber component. Optical signals are routed from one live multi-fiber component to another in a parallel optical connection configuration, with each group of optical signals corresponding to a respective group of fiber positions on each live multi-fiber component. Each group of optical signals is also routed to one of the first and second groups of fiber positions of the at least one tap multi-fiber component in a parallel optical connection configuration. In this manner, fiber optic signals can be simultaneously provided and monitored within an active fiber optic network using a parallel optical configuration without the need for interrupting network operations.

A radio frequency (RF)/free space optical (FSO) hybrid transceiver includes at least one FSO sub-transceiver configured for emitting and receiving optical communication signals, and at least one RF sub-transceiver configured for emitting and receiving RF communication signals. The RF sub-transceiver and the FSO sub-transceiver cooperate to simultaneously emit and receive optical and RF communication signals at the RF/FSO hybrid transceiver. The RF/FSO hybrid transceiver may further include a processor for controlling the RF and FSO sub-transceivers, and for processing both the RF and optical communication signals. The RF/FSO hybrid transceiver may also include a splitter/combiner, delay systems, and mirrors configured to cooperate with the processor to produce a plurality of rays.

A radio frequency (RF)/free space optical (FSO) hybrid transceiver includes at least one FSO sub-transceiver configured for emitting and receiving optical communication signals, and at least one RF sub-transceiver configured for emitting and receiving RF communication signals. The RF sub-transceiver and the FSO sub-transceiver cooperate to simultaneously emit and receive optical and RF communication signals at the RF/FSO hybrid transceiver. The RF/FSO hybrid transceiver may further include a processor for controlling the RF and FSO sub-transceivers, and for processing both the RF and optical communication signals. The RF/FSO hybrid transceiver may also include a splitter/combiner, delay systems, and mirrors configured to cooperate with the processor to produce a plurality of rays.

Systems, methods, and non-transitory computer readable media are configured to determine an optical length of an event in a cable. A physical length of the event in the cable can be determined based on a correlation between optical lengths and physical lengths in the cable. A geographic location of the event can be provided based on the physical length of the event.

An excitation light source device includes: an excitation light source to generate the Raman excitation light; a light source controller to control an intensity of the Raman excitation light; an amplified spontaneous emission noise measurer to measure an intensity of amplified spontaneous emission noise caused by the Raman excitation light; and a transmission line abnormality analyzer to detect abnormality in the transmission line on a basis of a control state of the light source controller and a measurement result of the amplified spontaneous emission noise measurer. In a state where the abnormality is not detected, the light source controller controls the intensity of the Raman excitation light to gradually increase to a set value. In a state where the abnormality is detected, the light source controller controls the excitation light source to stop or reduce generation of the Raman excitation light.

An excitation light source device includes: an excitation light source to generate the Raman excitation light; a light source controller to control an intensity of the Raman excitation light; an amplified spontaneous emission noise measurer to measure an intensity of amplified spontaneous emission noise caused by the Raman excitation light; and a transmission line abnormality analyzer to detect abnormality in the transmission line on a basis of a control state of the light source controller and a measurement result of the amplified spontaneous emission noise measurer. In a state where the abnormality is not detected, the light source controller controls the intensity of the Raman excitation light to gradually increase to a set value. In a state where the abnormality is detected, the light source controller controls the excitation light source to stop or reduce generation of the Raman excitation light.

Systems and methods for collecting information regarding optical connections in an FDH are disclosed. An example FDH includes: a bulkhead having a plurality of passive optical couplers, each of the plurality of passive optical couplers having a respective first port adapted to receive an end of a respective first optical fiber, a respective second port adapted to receive an end of a respective second optical fiber, and a respective passive optical activity indicator configured to expose (i) a portion of first light propagating in the respective first optical fiber when the first optical fiber is received in the first port, and (ii) a portion of second light propagating in the respective second optical fiber when the second optical fiber is received in the second port; and an image sensor configured to capture one or more images of the respective passive optical activity indicators of the plurality of passive optical couplers.

An optical path for transmission of data from a source node to a destination node comprises an optical channel for parallel transmission of non overlapping carrier frequencies. The frequency separation of the carriers is lower than the baud rate. The optical path is configured by (a) determining a path OSNR (OSNR.sub.p ); (b) selecting a carrier bandwidth (BW) so that the channel bandwidth (BW.sub.T ) is less than or equal to a maximum path bandwidth available for transmission, wherein BW.sub.T≈BW.Math.C, wherein C is the number of carrier frequencies; (c) selecting a FEC code having a minimum overhead requirement; (d) determining a channel OSNR (OSNR.sub.T ) based on the currently selected BW and FEC code; (e) in response to determining that OSNR.sub.T is not less than or equal to OSNR.sub.p, reselecting new codes having increasing overhead requirements until OSNR.sub.T is less than OSNR.sub.p, and if this is not possible increasing BW.sub.T and returning to step (c); (h) configuring the path for transmission based on the finally selected BW.sub.Tand FEC code.

A system (20) for fiber-optic reflectometry includes an optical source (28, 40), a beat detection module (52, 56) and a processor (36). The optical source is configured to generate an optical interrogation signal that is transmitted into an optical fiber (24). The beat detection module is configured to receive from the optical fiber an optical backscattering signal in response to the optical interrogation signal, and to mix the optical backscattering signal with a reference replica of the optical interrogation signal using In-phase/Quadrature (I/Q) mixing, so as to produce a complex beat signal having In-phase (I) and Quadrature (Q) components. The processor is configured to sense one or more events affecting the optical fiber by analyzing the I and Q components of the complex beat signal.

A system (20) for fiber-optic reflectometry includes an optical source (28, 40), a beat detection module (52, 56) and a processor (36). The optical source is configured to generate an optical interrogation signal that is transmitted into an optical fiber (24). The beat detection module is configured to receive from the optical fiber an optical backscattering signal in response to the optical interrogation signal, and to mix the optical backscattering signal with a reference replica of the optical interrogation signal using In-phase/Quadrature (I/Q) mixing, so as to produce a complex beat signal having In-phase (I) and Quadrature (Q) components. The processor is configured to sense one or more events affecting the optical fiber by analyzing the I and Q components of the complex beat signal.