scispace - formally typeset
Search or ask a question
Topic

L band

About: L band is a research topic. Over the lifetime, 674 publications have been published within this topic receiving 4570 citations.


Papers
More filters
Patent
Naito Takao1, Naomasa Shimojoh1
10 Aug 2000
TL;DR: In this paper, an optical amplifier is provided for performing amplification of optical signals of two wavelength bands, where deterioration in the optical SN ratio relative to one wavelength band is reduced, with a simple construction which can deal with restrictions on installation space, power consumption and the like.
Abstract: An optical amplifier is provided for performing amplification of optical signals of two wavelength bands, where deterioration in the optical SN ratio relative to one wavelength band is reduced, with a simple construction which can deal with restrictions on installation space, power consumption and the like. To this end, the present optical amplifier has a C/L band optical amplifying section for amplifying respective optical signals of a C band and an L band, a demultiplexer for demultiplexing output light from the C/L band optical amplifying section into the C band and the L band, an L band optical amplifying section for amplifying L band optical signals which have been demultiplexed by the demultiplexer, and a multiplexer for multiplexing the C band optical signals which have been demultiplexed by the demultiplexer and the L band optical signals which have been amplified by the L band optical amplifying section. The construction is such that a part of excitation light of a 1480nm band used in the C/L band optical amplifying section is supplied via an input terminal to a Raman amplification producing medium of a transmission path, and Raman amplified L band optical signals are input to the C/L band optical amplifying section.

7 citations

Proceedings ArticleDOI
01 Jan 1984

6 citations

Proceedings ArticleDOI
03 Dec 2010
TL;DR: In this article, a wideband orthomode transducer (OMT) with an integrated directional coupler for radio astronomy applications in the frequency range 900 MHz to 1760 MHz is presented.
Abstract: The design of a wideband orthomode transducer (OMT) with an integrated directional coupler for radio astronomy applications in the frequency range 900 MHz to 1760 MHz is presented. The OMT has very low insertion and transmission losses, good isolation, and is of small size.

6 citations

Proceedings ArticleDOI
01 Sep 2017
TL;DR: In this paper, the software controlled and assisted radio commanding of VZLUSAT-1 nanosatellite during the QB50 scientific mission is described with the aim to increase data throughput during commanding Software controlled autonomous and software assisted semi-autonomous modes allow effective commanding of satellite while keeping the operator to the satellite condition and keeping the full control over the radio transmission as radio amateur regulation requires.
Abstract: Nano- and pico-satellites are currently used as low cost in-orbit-demonstrators of new technologies or for the university research These satellites are launched to the low Earth orbits and radio commanded from the ground control stations Most of them are equipped with narrow band transceivers working in UHF radio amateur frequency band, reaching only low data transmission rates Low Earth orbits also limits the number and duration of satellite passing in the range of ground control station One ground control station has approximately six satellite passes per day, each with duration only in few minutes This strictly limits the amount of transmitted data between satellite and ground control station In this paper the software controlled and assisted radio commanding of VZLUSAT-1 nanosatellite during the QB50 scientific mission is described Two basic modes of satellite radio commanding are described with the aim to increase data throughput during commanding Software controlled autonomous and software assisted semi-autonomous modes allow effective commanding of satellite while keeping the attention of satellite operator to the satellite condition and keeping the full control over the radio transmission as radio amateur regulation requires Also the critical operational limits of satellite electronics faces to cosmic vacuum and radiation environment have to be continuously monitored for safety satellite operation

6 citations

Network Information
Related Topics (5)
Radar
91.6K papers, 1M citations
89% related
Pixel
136.5K papers, 1.5M citations
83% related
Antenna (radio)
208K papers, 1.8M citations
76% related
Optical fiber
167K papers, 1.8M citations
76% related
Amplifier
163.9K papers, 1.3M citations
76% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20232
202222
202134
202036
201944
201838