An optical communication system includes: transmitting apparatuses that convert a first data signal into a plurality of optical-signal packet signals; optical couplers that combine optical-signal packet signals and split the combined optical-signal packet signals into a plurality of optical-signal transmission signals; receiving apparatuses that receive the optical-signal transmission signals and convert the optical-signal transmission signals into a second data signal and a controller that controls operation of the transmitting apparatuses and the receiving apparatuses. The transmitting apparatuses transmit the plurality of optical-signal packet signals, allocating communication resources thereto to prevent the transmitted optical-signal packet signals from colliding with the optical-signal packet signals transmitted from the other transmitting apparatuses. The receiving apparatuses convert the optical-signal transmission signals into electrical-signal transmission signals, select specified signal portions, and output the selected signal portions as the second data signal.

A system and related method for multiple-sensitivity optical phase modulation splits an optical carrier generated by a photonic source into at least two copies and directs the copies through an electro-optical (EO) phase modulator wherein the optical field associated with the optical carrier overlaps with a radio frequency (RF) electrical field associated with a radio frequency (RF) input signal, such that the EO modulator phase-modulates each optical copy according to the RF input signal of interest based on characteristics distinct to each optical copy (e.g., relative strength of, or proximity of the optical carrier to, the overlapping electrical field) that provide for phase modulation of each optical copy at a different sensitivity voltage. The variably modified optical copies are directed to a photonic processor for further signal processing in the optical domain.

Disclosed is an electronic device (1) for converting a wireless signal (2) in the mm-wave or sub-THz range into at least one modulated optical signal (16). The electronic device (1) comprises an antenna element (11) for converting the wireless signal (2) into a guided electrical signal (12), wherein the antenna element (11) is arranged on a printed circuit board (10b′) or on a first integrated chip (10′). The electronic device (1) comprises an electrical signal converter (13) for converting the at least one guided electrical signal (12) into a conditioned electrical signal (14), wherein the electrical signal converter (13) is arranged on a second integrated chip (10″). The electronic device (1) comprises a modulator (15) for converting the conditioned electrical signal (14) into the modulated optical signal (16), wherein the modulator (15) is arranged on a third integrated chip (10′″), and wherein the modulator (15) comprises a waveguide (151) and a cladding (152) comprising a first cladding portion (1521) having a conductive material at an interface with the waveguide (151) and a second cladding portion (1522) having a conductive material at an interface with the waveguide (151).

An optical frequency transfer device based on passive phase compensation and a transfer method are provided, where the device comprises a local side, a transfer link and a user side. Optical frequency transfer based on passive phase compensation is achieved by simple optical frequency mixing, microwave filtration, and frequency division processing in a passive phase compensation manner, and the device has simple system structure and high reliability.

An optoelectronic transmitter (10) includes an electro-optic modulator (12), digital driving circuitry (14), and feedback circuitry (30). The electro-optic modulator is configured to modulate an optical signal in response to an electrical drive signal. The digital driving circuitry is coupled to the electro-optical modulator and is configured to generate the electrical drive signal. The feedback circuitry is configured to measure a quantity indicative of a power level of the modulated optical signal produced by the electro-optic modulator, and to adapt a supply voltage to the digital driving circuitry in response to the measured quantity.

A distributed antenna system (DAS) for multi-carrier and multi-frequency band based on an O-RAN standard in an open radio access network (O-RAN)-based mobile communication network is provided. The DAS includes an O-RAN remote unit (RU) connected to a fronthaul network according to an O-RAN split option specification of base station transceiver systems (BTSs), and comprising a plurality of O-RAN RUs to accommodate a plurality of carriers and a plurality of frequency bands, and a channel combiner to which outputs of the plurality of O-RAN RUs are combined. The channel combiner is an analog combiner. The DAS further includes an optical distribution unit (ODU) connected to the analog combiner, and a radio unit (RU) connected to the ODU. The RU includes an optical receiving unit (ORU), a high power amplifier (HPA), a low noise amplifier (LNA), and a duplexer or filter.

Optical transmitters and receivers for improving synchronization of data transmitted over an optical network are described. The receiver can perform non-linear filtering as part of framer index estimation operations to improve the synchronization. The receiver can determine estimated positions of framer indices in data frames received from the transmitter. Next, using a non-linear filter, the receiver can remove estimated positions that are likely erroneous or are greater than a threshold away from the median or mode estimated framer index position. By removing the likely erroneous estimated positions, the receiver can then determine the estimated position of a framer index position for multiple frames with greater confidence.

The fiber optic communication system for vehicles is a system for extending communication capabilities for vehicles, such as ships and other watercraft, for example, through connection to an external wireless communication module using a fiber optic cable. The fiber optic communication system for vehicles includes a first fiber optic converter adapted to be carried by the vehicle and further adapted for electrical connection to at least one user device. The fiber optic communication system for vehicles further includes a second fiber optic converter adapted to be positioned remotely from the vehicle and the first fiber optic converter. At least one fiber optic cable optically couples the first fiber optic converter and the second fiber optic converter, and a wireless communication module is in electrical communication with the second fiber optic converter.

An optical detection device includes a photocurrent input terminal; a first branch connected to the photocurrent input terminal includes a plural of MOS transistors; a second branch connected to the photocurrent input terminal includes a plural of MOS transistors. The MOS transistors in the first branch and the MOS transistors in the second branch are arranged in a mirror image manner; a control module connected to the first branch and the second branch to turn on or off the MOS transistors in the second branch; a first auxiliary current input terminal connected to the first branch and a second auxiliary current input terminal connected to the first branch, which are used to compensate the current of the MOS transistors in the first branch; a first current output terminal connected to the first branch and the second branch.

An optical detection device includes a photocurrent input terminal; a first branch connected to the photocurrent input terminal includes a plural of MOS transistors; a second branch connected to the photocurrent input terminal includes a plural of MOS transistors. The MOS transistors in the first branch and the MOS transistors in the second branch are arranged in a mirror image manner; a control module connected to the first branch and the second branch to turn on or off the MOS transistors in the second branch; a first auxiliary current input terminal connected to the first branch and a second auxiliary current input terminal connected to the first branch, which are used to compensate the current of the MOS transistors in the first branch; a first current output terminal connected to the first branch and the second branch.