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Optical communication

About: Optical communication is a research topic. Over the lifetime, 22297 publications have been published within this topic receiving 273235 citations. The topic is also known as: optical telecommunication.


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Patent
29 Oct 2003
TL;DR: In this article, the authors proposed a utility model for optical group filter for optical fiber communication, which consists of an optical splitter 2 and a collimator 9, which can be used for reducing the Michelson interference.
Abstract: The utility model belongs to an optical group filter for optical fiber communication, which comprises an optical splitter 2 and a collimator 9. Two cascade connection F-P resonant cavities composed of two groups of reflectors can generate the Michelson interference. The bandwidth is fully used for reducing the channel spacing. The utility model has the advantages of less distortion, good consistency, flat bandwidth and high isolation. The bandwidth can be selected according to needs of channel spacing. When the spacing of input light signals of multiple wavelength is 50GHz, the output to the spacing of two channels is 100GHz. One path of bandwidth is 60GHz, and the transmission rate is 40Gb/s. The other path of bandwidth is 40GHz, and the transmission rate is 10Gb/s. The channel with the bandwidth of 100GHz realizes the average rate of transmission of 50Gb/s; compared with the background technology, the average rate of transmission is improved by 10Gb/s. The utility model is used for a wavelength division multiplex system, an optical up/down path multiplexer, the intersecting interconnection of optics, and optical wave filtration in optical communication.

4 citations

Patent
04 Nov 2011
TL;DR: In this paper, an optical communication system connects a plurality of user-side optical line termination devices (hereinafter ONU) to a station-side OLT using a common optical fiber.
Abstract: PROBLEM TO BE SOLVED: To suppress power consumption while continuing communication.SOLUTION: An optical communication system connects a plurality of user-side optical line termination devices (hereinafter ONU) to a station-side optical line termination device (hereinafter OLT) using a common optical fiber. At least some of the plurality of ONUs each include a transmitter receiver which has a power-saving function of halting a transmission portion while supplying electric power to a reception portion, and a controller which transmits adaptation information on the power-saving function to the OLT through the transmitter receiver. The OLT includes a controller which generates transmission acknowledgement information on uplink communication based upon the adaptation information on the power-saving function, and a transmitter receiver which receives the adaptation information on the power-saving function and transmits the transmission acknowledgement information to the ONU.

4 citations

Journal Article
TL;DR: In this article, a photonic crystal fiber (PCF) with zero dispersion wavelength of 810 nm and a polarization-maintaining low-loss (1.3 dB/km) PCF is discussed.
Abstract: Recent progress on photonic crystal fibers (PCFs) is reviewed aiming at their application to optical communications. The technology needed to design and fabricate PCF is described and recent experimental results of a PCF with zero dispersion wavelength of 810 nm and a polarization-maintaining low-loss (1.3 dB/km) PCF are shown. The possibility of their application to optical communications is discussed.

4 citations

Patent
Kensuke Takahashi1
07 May 2015
TL;DR: In this paper, an optical amplifier, a light reception element, and a controller are configured to decrease a gain of the optical amplifier according to an optical signal power input to the optical amplifiers in response to a detection of a recovery of the light reception signal from an interruption of optical signal.
Abstract: Provided are an optical amplifier, a light reception element, and a controller configured to decrease a gain of the optical amplifier according to an optical signal power input to the optical amplifier in response to a detection of a recovery of the optical signal input to the optical amplifier from an interruption of the optical signal and to increase the gain of the optical amplifier so that an input optical power to the light reception element approaches a target value after the decreasing of the gain.

4 citations

Proceedings ArticleDOI
25 Jul 2005
TL;DR: In this article, the authors proposed a photon counting direct detection (PCD) method for photon starved optical communications links, as in deep space scenarios, where high bandwidth communications requires a corresponding high bandwidth detector with a high saturation fluence, especially in the presence of a large background noise flux, as is encountered during daytime optical link operations.
Abstract: Photon counting direct detection allows communications past the classical limit of 288 bits/photon, and is an attractive solution for photon starved optical communications links, as in deep space scenarios High bandwidth communications requires a corresponding high bandwidth detector with a high saturation fluence, especially in the presence of a large background noise flux, as is encountered during daytime optical link operations Traditional photon counting optical detectors, such as Geiger mode avalanche photodiodes and photomultiplier tubes, have been developed primarily for low rate / low flux applications such as fluorescence spectroscopy Ground based detectors have an additional requirement of large area since a single spatial mode transmit signal is scattered into many spatial modes by atmospheric turbulence, resulting in a solid angle times area (Lagrange) invariant that must be processed by the optical receiver train As there is a physical limit to the solid area (2/spl pi/ steradians for single side illumination), there is thereby a corresponding minimum detector area that is proportional to the number of spatial modes

4 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023141
2022319
2021592
2020872
20191,016
2018922