Abstract: An optical transmitter generates symbols for transmission by applying a predetermined coding method to each of m-valued transmission symbols generated from transmission data, generates signal light by performing optical modulation on the basis of the symbols for transmission, and transmits the signal light. An optical receiver generates a series of digital signals from the received signal light, detects coded symbols by applying predetermined digital signal processing to the series of digital signals, decodes the m-valued transmission symbols from the detected coded symbols, and restores the transmission data from the decoded m-valued transmission symbols.

Abstract: An optical power supply converter (1) that photoelectrically converts light from optical fiber cables comprises a reflecting unit (3) including a concave reflecting mirror (6) made of a rotating paraboloid, a light receiving element (2) including a light receiving surface (2a) at the focus of the mirror (6) orthogonal to the rotation axis of the mirror (6), and a plurality of mounting portions (9) for mounting the emitting ends (OE) of the fiber cables. The seperation distance (s), the shift distance (h) and the divergence angle (?) are set appropriately so as to concentrate all reflected light on the light receiving surface (2a).

Abstract: A submarine optical communication system includes a first submarine device and a second submarine device. The first submarine device includes a first monitoring circuit for monitoring an operation state of the first submarine device and a first optical signal adjusting circuit for adjusting an intensity of an optical signal in a first wavelength band based on a first monitoring result obtained by the first monitoring circuit and outputting the adjusted optical signal as an optical signal including the first monitoring result. The second submarine device includes a second monitoring circuit for monitoring an operation state of the second submarine device and a second optical signal adjusting circuit for adjusting an intensity of an optical signal in a second wavelength band based on a second monitoring result obtained by the first monitoring circuit and outputting the adjusted optical signal as an optical signal including the second monitoring result.

Abstract: In one embodiment, a method includes receiving power delivered over a data fiber cable at an optical transceiver installed at a network communications device and transmitting data and the power from the optical transceiver to the network communications device. The network communications device is powered by the power received from the optical transceiver. An apparatus is also disclosed herein.

Abstract: An optical frequency control device includes: a detection circuit to receive first light including a first frequency, receive second light including a second frequency, modulate the first light with a local oscillation signal, and detect a differential beat signal between the frequency of sideband light included in the modulated first light and the second frequency; a light source control circuit to change the second frequency by frequency-dividing the differential beat signal with a first frequency division number, by frequency-dividing a reference signal with a second frequency division number, and by outputting a phase error signal indicating a phase difference between the frequency-divided differential beat signal and the frequency-divided reference signal; and a signal processing unit to set each of the first frequency division number and the second frequency division number according to the set value of a frequency difference between the first frequency and the second frequency.

Abstract: A communication system that includes a master communication device at a first location in a defined indoor area, a service communication device at a second location in the defined indoor area, and passive optical routing devices at a plurality of locations in the defined indoor area. The master communication device obtains a first signal from a data source or a modem and directs a first laser beam carrying the first signal in a downstream path to a service communication device directly or via the plurality of passive optical routing devices based on defined connectivity criterions. The service communication device demodulates the first signal from the first laser beam, distributes one or more wireless signals to end-user devices, and further obtains one or more second signals from end-user devices and re-transmits obtained signals over second laser beam in upstream path to master communication device directly or via the passive optical routing devices.

Abstract: Systems and methods are described for transmitting information optically. For instance, a system may include an optical source configured to generate a beam of light. The system may include at least one modulator configured to encode data on the beam of light to produce an encoded beam of light/encoded plurality of pulses. The system may include a spectrally-equalizing amplifier configured to receive the encoded beam of light/encoded plurality of pulses from the at least one modulator and both amplify and filter the encoded beam of light/encoded plurality of pulses to produce a filtered beam of light/filtered plurality of pulses, thereby spectrally equalizing a gain applied to the encoded beam of light. In some cases, the system may slice the beam of slight, to ensure a detector has impulsive detection. In some cases, the system may include a temperature controller to shift a distribution curve of wavelengths of the optical source.

Abstract: An optical network unit (ONU) receives an Ethernet packet sent by user device and slices the Ethernet packet based on information about a minimum transmission unit to generate a first Ethernet packet slice, where a length of the minimum transmission unit is an integer multiple of a length of the first Ethernet packet slice. The ONU encapsulates the Ethernet packet slice and a slice identifier into a GEM frame, wherein the slice identifier indicates that the length of the minimum transmission unit of the OTN is an integer multiple of the length of the Ethernet packet slice. The Ethernet packet slice does not need to be processed by a network processor or a traffic management module in transmission of the OLT, thereby reducing a delay of network transmission.

Abstract: Embodiments are disclosed for reduced lane utilization for an optical transceiver. An example optical transceiver apparatus includes at least one optical source and an optical connector. The at least one optical source is attached to a printed circuit board (PCB) and is configured to facilitate communication of optical signals. The PCB comprises an electrical connector electrically connected to the at least one optical source and is configured to facilitate communication of electrical signals. Furthermore, the PCB is attached to a mechanical structure. The optical connector is attached to the mechanical structure and is coupled to the at least one optical source via at least one optical fiber that facilitates transmission of the optical signals.

Abstract: The technology employs a state-based power control loop (PCL) architecture to maintain tracking and communication signal-to-noise ratios at suitable levels for optimal tracking performance and data throughput in a free-space optical communication system. Power for a link is adjustable to stay within a functional range of receiving sensors in order to provide continuous service to users. This avoids oversaturation and possible damage to the equipment. The approach can include decreasing or increasing the power to counteract a surge or drop while maintaining a near constant received power at a remote communication device. The system may receive power adjustment feedback from another communication terminal and perform state-based power control according to the received feedback. This can include re-initializing and reacquiring a link with the other communication terminal automatically after loss of power, without human intervention.

Abstract: A multi-channel light emitting module includes a base, at least one light emitting unit provided on the base, an optical modulation chip provided on the base, and an optical transmission component. The optical modulation chip includes an encapsulation structure and a thin film lithium niobate (LiNbOx) modulator provided in the encapsulation structure. The thin film LiNbOx modulator is optically coupled with the at least one light emitting unit, and the light emitting unit is provided outside the encapsulation structure. The optical transmission component is optically coupled with the thin film LiNbOx modulator.

Abstract: Methods and apparatus for a reconfigurable optical add-drop multiplexer (ROADM) cluster node are provided. In some embodiments, the ROADM cluster node includes a set of g line chassis for performing line functionality. In some embodiments, the ROADM cluster node further includes a set of h add-drop chassis for performing add-drop functionality. In some embodiments, each of the g line chassis includes a set of N line cards and a set of M interconnect cards. In some embodiments, the ROADM cluster node further includes a set of M interconnect chassis configured for interconnecting each line chassis to each other line chassis. In some embodiments, the set of M interconnect chassis is further configured for interconnecting each line chassis to each of the h add-drop chassis. In some embodiments, the ROADM cluster node separates the line functionality and add-drop functionality. In some embodiments, 1.15N?M?1.5N.

Abstract: Networks comprising multiple non-overlapping communication topologies are presented. The networks can include a fabric of interconnected network nodes capable of providing multiple communication paths among edge devices. A topology manager constructs communication topologies according to restriction criteria based on required security levels (e.g., top secret, secret, unclassified, etc.). Established topologies do not have overlapping networking infrastructure to within the bounds of the restriction criteria as allowed by the security levels.

Abstract: This application provides an example wireless center device and an example wireless device for delay measurement, and an example wireless communication system. The example wireless center device includes a delay measurement circuit, configured to obtain a first clock signal of the wireless center device, and a modem configured to send a first optical wave and a second optical wave to the wireless device through a fiber link, where the first optical wave carries the first clock signal, receive the second optical wave that is sent by the wireless device and that carries a second clock signal, receive a second sub optical wave reflected by the wireless device to obtain the second clock signal carried by the second optical wave and a first clock signal carried by the second sub optical wave, and send the second clock signal and the first clock signal to the delay measurement circuit.

Abstract: An interference cancellation system may include a radio frequency (RF) transmitter configured to generate an RF interference signal, and an RF receiver configured to receive an RF input signal that includes a signal of interest component and an RF interference signal component from the RF transmitter. The system may also include an electro-optical (EO) modulator configured to apply an interference cancellation phase shift to the RF interference signal, an optical-to-electrical (OE) converter, and an optical path between the EO modulator and OE converter. The system may also include an RF dispersive delay filter connected to the OE converter, and an RF coupler connected to the RF dispersive delay filter and the RF receiver to subtract the RF interference signal component from the RF input signal thereby producing the signal of interest component.

Abstract: Embodiments relate to a free space optical (FSO) terminal that transmits and receives optical beams. The FSO terminal includes a fore optic and a rotatable dispersive optical component. A receive (Rx) optical beam from the remote FSO communication terminal is received through the fore optic, and a transmit (Tx) optical beam is transmitted through the fore optic. The dispersive optical component is positioned along the optical paths of both the Rx and Tx optical beams. Since the Rx and Tx optical beams have different wavelengths and the dispersive optical component has a wavelength dependence, the dispersive optical component creates an angular separation between the Rx and Tx optical beams. The controller controls the rotational position of the dispersive optical component (and possibly also the wavelength of the Tx optical beam) to achieve a desired angular separation between the Rx and Tx optical beams.

Abstract: A power over fiber system includes a power sourcing equipment, a powered device, optical fiber cables, optical switches, a detector and a control device. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light into electric power. The optical fiber cables transmit the feed light. The optical switches selectively connect the optical fiber cables. The optical fiber cables and the optical switches can form at least two transmission routes of the feed light. The detector detects a poor transmission point on a transmission route among the transmission routes of the feed light. The control device controls the optical switches so as to form another transmission route among the transmission routes of the feed light in accordance with the poor transmission point, the transmission route bypassing the poor transmission point.

Abstract: A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable and a converter. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light into electric power. The optical fiber cable has one end connectable to the power sourcing equipment and another end connectable to the powered device to transmit the feed light. The converter converts a wavelength of the feed light.

Abstract: In some embodiments, an optical communication system may include an optical source, a modulator, and a photoreceiver. The optical source may be configured to generate a beam comprising a series of light pulses. The photoreceiver may have a detection window duration of 1 nanosecond or less. When a first pulse travels through a variably refractive medium, photons in the first pulse may be refracted to travel along different ray paths to arrive at the photoreceiver according to a temporal distribution curve. A full width at half maximum (FWHM) value of the temporal distribution curve may be greater than a coherence time value of the first pulse, and the detection window of the photoreceiver may be greater than the FWHM value of the temporal distribution curve.

Abstract: Aspects of the present disclosure describe distributed fiber optic sensor systems, methods, and structures that advantageously enable/provide for the proper placement/assignment of sensors in the DFOS network to provide for high reliability, fault tolerant operation that survives fiber failures.