An optical isolator system comprises an electrical-to-optical converter apparatus for receiving an input electrical signal from a system of an aircraft and converting the input electrical signal into an optical signal which is representative of the input electrical signal. The optical isolator system further comprises an optical-to-electrical converter apparatus for receiving the optical signal from the electrical-to-optical converter apparatus, for converting the received optical signal into an output electrical signal which is representative of the received optical signal, and for transmitting the output electrical signal to a portable server for the wireless distribution of content such as visual content, web content, video content, audio content, games, services, information and/or advertising content to clients in the aircraft. Associated methods are also described.

An optical isolator system comprises an electrical-to-optical converter apparatus for receiving an input electrical signal from a system of an aircraft and converting the input electrical signal into an optical signal which is representative of the input electrical signal. The optical isolator system further comprises an optical-to-electrical converter apparatus for receiving the optical signal from the electrical-to-optical converter apparatus, for converting the received optical signal into an output electrical signal which is representative of the received optical signal, and for transmitting the output electrical signal to a portable server for the wireless distribution of content such as visual content, web content, video content, audio content, games, services, information and/or advertising content to clients in the aircraft. Associated methods are also described.

Methods, systems, and devices for network communications to reduce optical beat interference (OBI) in upstream communications are described. For example, a fiber node may provide a narrow band seed source to injection lock upstream laser diodes. Therefore, upstream communications from each injection locked laser diode may primarily include the wavelength associated with each seed source. The seed sources may be unique to each end device and configured to minimize OBI. That is, the upstream laser diodes may be generic, but the received seed source may enable upstream communications at varying wavelengths. The fiber node may provide each seed source by filtering (e.g., by a grating filter) a broadband light source.

This disclosure describes a wavelength division multiplexing passive optical network system (100) comprising an optical line terminal (180) for controlling transmission of data that are carried by optical signals across the optical network system along an upstream or downstream path; a signal modulating loop circuit including a circulator (110) connected to the optical line terminal (180) for determining the transmission paths of the optical signals; a splitter (120) connected to the circulator (110) for splitting the optical signals into a first portion of optical signals and a second portion of optical signals according to a predetermined ratio; an amplifier (160) connected to the splitter (120) for amplifying the second portion of optical signals; and a modulator (170) connected in between the amplifier (160) and the splitter (120) for modulating the amplified second portion of optical signals to be transmitted to the circulator (110); a converter (140) connected to the splitter (130) for converting the first portion of optical signals into electrical signals; and one or more optical network units (150) connected in between the converter (140) and modulator (170) for receiving the electrical signals from the converter (140), and transmitting electrical signals to the modulator (170) for converting the electrical signals into optical signals to be transmitted together with the amplified second portion of optical signals to the optical line terminal (180); wherein the circulator (110) directs the optical signals received from the modulator (170) to the splitter (120) for being transmitted back into the signal modulating loop circuit and/or towards the optical network units along the downstream path, or towards the optical line terminal along the upstream path.

This disclosure describes a wavelength division multiplexing passive optical network system (100) comprising an optical line terminal (180) for controlling transmission of data that are carried by optical signals across the optical network system along an upstream or downstream path; a signal modulating loop circuit including a circulator (110) connected to the optical line terminal (180) for determining the transmission paths of the optical signals; a splitter (120) connected to the circulator (110) for splitting the optical signals into a first portion of optical signals and a second portion of optical signals according to a predetermined ratio; an amplifier (160) connected to the splitter (120) for amplifying the second portion of optical signals; and a modulator (170) connected in between the amplifier (160) and the splitter (120) for modulating the amplified second portion of optical signals to be transmitted to the circulator (110); a converter (140) connected to the splitter (130) for converting the first portion of optical signals into electrical signals; and one or more optical network units (150) connected in between the converter (140) and modulator (170) for receiving the electrical signals from the converter (140), and transmitting electrical signals to the modulator (170) for converting the electrical signals into optical signals to be transmitted together with the amplified second portion of optical signals to the optical line terminal (180); wherein the circulator (110) directs the optical signals received from the modulator (170) to the splitter (120) for being transmitted back into the signal modulating loop circuit and/or towards the optical network units along the downstream path, or towards the optical line terminal along the upstream path.

An apparatus comprising a signal generator configured to produce a modulation signal, a filter coupled to the signal generator and configured to filter the modulation signal to produce a cancellation signal, and a reflective semiconductor optical amplifier (RSOA) coupled to the signal generator and the filter, wherein the RSOA is configured to generate an optical signal according to a difference between the modulation signal and the cancellation signal and transmit the optical signal towards a partial reflection mirror (PRM).

An apparatus comprising a signal generator configured to produce a modulation signal, a filter coupled to the signal generator and configured to filter the modulation signal to produce a cancellation signal, and a reflective semiconductor optical amplifier (RSOA) coupled to the signal generator and the filter, wherein the RSOA is configured to generate an optical signal according to a difference between the modulation signal and the cancellation signal and transmit the optical signal towards a partial reflection mirror (PRM).

A fiber-to-coax optical network unit for converting one or more Gigabit or Ethernet Passive Optical Network (GPON or EPON) fibers to one or more coaxial cable lines to connect a subscriber's premises to a Community Access Television (CATV) system.

An optical link including an optical computing device having an integrated computational element (ICE), and a method for using the device to perform a remote measurement of a characteristic of a sample with the optical computing device are provided. The optical computing device provides an optical computing signal proportional to a characteristic of a sample from an interacted light provided to the ICE. The device includes an optical transducer to provide a modulating signal based on the optical computing signal and a modulator to modulate a first portion of a transmission light in an optical waveguide based on the modulating signal.

An optical system and method for seeding an optical transmitter includes a first optical transmitter comprising a first reflective optical amplifier and a second optical transmitter comprising a second reflective optical amplifier. The second optical transmitter is optically coupled to the first optical transmitter. The optical system also includes an optical cavity for seeding the first reflective optical amplifier with a first optical seed signal. The optical cavity is formed between the first reflective optical amplifier of the first optical transmitter and the second reflective optical amplifier of the second optical transmitter. The first reflective optical amplifier is configured to transmit a first optical signal to the second reflective optical amplifier and the second reflective optical amplifier is configured to provide the first optical seed signal by reflecting a portion of the first optical signal back to the first reflective optical amplifier.