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Wavelength-division multiplexing

About: Wavelength-division multiplexing is a research topic. Over the lifetime, 25059 publications have been published within this topic receiving 332027 citations. The topic is also known as: WDM.


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Patent
27 Sep 1995
TL;DR: In this paper, an optical transmitter consisting of a light source, a band-pass filter for filtering a light generated by the light source and a light splitting means for splitting a light output by the bandpass filter into at least two split lights is presented.
Abstract: An optical transmitter provided by the present invention comprises: a light source; a band-pass filter for filtering a light generated by the light source; a light splitting means for splitting a light output by the band-pass filter into at least two split lights; an optical receiving unit for converting one of the split lights into an electrical signal having a level proportional to the intensity of the split light; and a control means for receiving the electrical signal for use in controlling the wavelength of the light source so as to sustain the intensity of the split light at a fixed value. With the configuration described above, fluctuations in wavelength occurring on the transmitter side can be reduced. On the top of that, by applying this optical transmitter to a WDM system, a system cold start can be done with ease.

76 citations

Journal ArticleDOI
TL;DR: In this paper, a visible, surface-emitting, solid-state diode laser for InGaAs, InP, and GaAs geometries, as well as for several other devices, is described and demonstrated.
Abstract: Proof-of-concept devices to create surface-emitting visible lasers are described and demonstrated. A visible, surface-emitting, solid-state diode laser for InGaAs, InP, and GaAs geometries, as well as for several other devices, is discussed. The use of a multilayer system to enhance the waveguide harmonic mixing over a large bandwidth is demonstrated. The resulting surface-emitted light can then be used to measure frequency differences of multiple optical channels in a fiber communication system. It can also be used for nonblocking switching systems. Since phase is preserved by the harmonic mixing, the device is also usable in coherent communication schemes. Experimental measurements of harmonic generation coefficients for a large Al alloy content in AlGaAs are presented. >

76 citations

Journal ArticleDOI
TL;DR: In this paper, a multichannel, polarization-insensitive, optically transparent wavelength converter based on four-wave mixing in two semiconductor optical amplifiers in a polarization-diversity arrangement is presented.
Abstract: Multichannel wavelength converters may be important components in the cross-connects in future wavelength-division multiplexed (WDM) transport networks. We demonstrate a multichannel, polarization-insensitive, optically transparent wavelength converter, based on four-wave mixing in two semiconductor optical amplifiers in a polarization-diversity arrangement. Bit-error-rate (BER) measurements with four input 2.5-Gb/s WDM channels, spaced by 2 nm, show penalties for wavelength conversion less than 2.6 dB at 10/sup -9/ BER. Changes in the state of polarization of the input signals cause the output power to change by less than 1.2 dB, and the corresponding power penalties change by less than 0.9 dB.

75 citations

Journal ArticleDOI
TL;DR: In this paper, a new use of quantum boxes for wavelength-domain multiplication optical memory applications is proposed, based on photo-creation of electron-hole pairs and their spatial separation by carrier tunneling.
Abstract: A new use of quantum boxes for wavelength-domain-multiplication optical memory applications is proposed. Persistent spectral-hole burning mechanism based on photo-creation of electron-hole pairs and their spatial separation by carrier tunneling is described. We discuss the feasibility of its application to optical data storage with emphasis on the memory duration and the multiplexing factor, that is, the possible number of bits stored in a laser-beam spot following the discussion by Moerner and Levenson.

75 citations

Journal ArticleDOI
TL;DR: A novel technological approach to space division multiplexing (SDM) based on the use of multiple individual fibers embedded in a common polymer coating material is presented, which is referred to as Multi- Element Fiber (MEF).
Abstract: A novel technological approach to space division multiplexing (SDM) based on the use of multiple individual fibers embedded in a common polymer coating material is presented, which is referred to as Multi-Element Fiber (MEF). The approach ensures ultralow crosstalk between spatial channels and allows for cost-effective ways of realizing multi-spatial channel amplification and signal multiplexing/demultiplexing. Both the fabrication and characterization of a passive 3-element MEF for data transmission, and an active 5-element erbium/ytterbium doped MEF for cladding-pumped optical amplification that uses one of the elements as an integrated pump delivery fiber is reported. Finally, both components were combined to emulate an optical fiber network comprising SDM transmission lines and amplifiers, and illustrate the compatibility of the approach with existing installed single-mode WDM fiber systems.

75 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023343
2022689
2021479
2020626
2019693
2018725