Optical Carrier transmission rates

About: Optical Carrier transmission rates is a research topic. Over the lifetime, 2463 publications have been published within this topic receiving 33293 citations.

A carrier-suppressed phase-modulated fiber optic link with IF downconversion of 30GHz 64-QAM signals

Abstract: We develop and demonstrate an efficient, simple fiber optic link for K-band through millimeter-wave signal relay and downconversion. The link uses optical phase modulation to simplify the transmitter and re-modulates the optical carrier with a local oscillator (LO) tone in the receiver, eliminating the need for a second frequency or phase-coherent optical heterodyne source. An optical notch filter in the receiver removes the carrier to allow direct detection of the intermediate frequency (IF). A 30 GHz signal is downconverted to a 140 MHz IF, with a measured noise figure (NF) of 32.5 dB, thirdorder spur-free dynamic range (SFDR) of 112 dB/Hz2/3, and only 3.5 dB RF conversion loss with 10mA of received DC photocurrent. A 10MBaud 64-QAM signal at 30 GHz is also passed through the link; the IF output has no measureable degradation in error vector magnitude (EVM) from the back-to-back, all-electrical case.

Method and system for bi-directional communication over a single optical fiber

Abstract: Gigabit Ethernet connectivity is realized using off-the-shelf GIGABIT INTERFACE CONVERTER transceivers, wave division multiplexer/demultiplexers, and a single optical fiber. Simultaneous and bi-directional optical communication over a single optical fiber connecting two or more nodes is achieved by using at least one GIGABIT INTERFACE CONVERTER transceiver having at least one optical signal output and an optical signal input that are of different wavelengths from each other.

Data transmission method in gigabit ethernet passive optical network

Abstract: Disclosed is a upstream data transmission method in a gigabit Ethernet-passive optical network (GE-PON) system. In the GE-PON system including an optical line termination having a scheduler and optical network units connected to the optical line termination, the optical line termination receives bandwidth allocation request signals from the optical network units at a start of a first cycle, allocates transmission bandwidths to the respective optical network units in accordance with the bandwidth allocation request signals, and transmits the allocated transmission bandwidths to the respective optical network units before a second cycle that follows the first cycle.

Optical local area network using a common optical carrier with separate user angle modulation

Abstract: The present invention relates to a multiple-user communication system wherein one carrier source is shared by a cascade of users of the system. More particularly, the present communication system uses a single carrier propagating along the system's transmissin medium onto which each user directly impresses the associated data or communication signal destined for another user preferably using either subcarrier angle modulation (phase or frequency) or TDM techniques for intensity or angle modulation. In the present system using subcarrier angle modulation, each user can either transmit or receive at a fixedly assigned or selectively assigned subcarrier channel, which is different from the subcarrier channel assigned to each of the other users. Where TDM techniques are used, the communication signal from a user can be directly impressed on the single carrier using intensity or phase modulation. With such communication system, amplifiers can be liberally used along the bus with no inter-modulation distortion since the amplifiers see a constant envelope signal. The use of ampmlifiers solves the problem of excessive signal loss incurred when multiple users tap into or out of, for example, an optical fiber bus.

Frequency-Tunable Microwave Generation Based on Time-Delayed Optical Combs

Abstract: A novel approach to generating a frequency-tunable microwave signal based on time-delayed optical combs is proposed and demonstrated. The fundamental principle is to generate multiple optical combs with identical comb profile, but with each optical comb carried by an optical carrier at a different wavelength. If the optical carriers are spaced with an identical wavelength spacing, the optical combs will be time delayed with an identical time delay after passing through a dispersive fiber. By applying these optical combs to a photodetector, microwave comb lines at the fundamental-order and higher order harmonic frequencies will be generated. For a well-designed time-delay structure, however, the desired microwave harmonic will have the highest output due to constructive interference, while the other harmonics will be suppressed. An analysis is performed, which is verified by a proof-of-concept experiment. A microwave signal that is tunable from 16.8 to 27 GHz is generated. The performance of the generated signal in terms of stability and phase noise is also evaluated.