Wyniki wyszukiwania - BazTech

1

Projektowanie jednomodowych światłowodów telekomunikacyjnych dla czujników wykorzystujących magnetooptyczne zjawisko Faradaya

Torbus S. A., Dutkiewicz P.

Przegląd Elektrotechniczny

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2015

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R. 91, nr 2

118-122

PL

W pracy krótko scharakteryzowano jednomodowe światłowody telekomunikacyjne, które mogą być stosowane do budowy czujników wykorzystujących magnetooptyczne zjawisko Faradaya. Zaprezentowano wyniki badań symulacyjnych dotyczących projektowania światłowodów jednomodowych oraz sformułowano wnioski dla projektantów światłowodów, które wynikają z właściwości materiałowych rozpatrywanych szkieł tlenkowych – domieszkowania rdzenia GeO2 oraz właściwości propagacyjnych i geometrycznych – długości fali odcięcia i geometrii rdzenia.

EN

In this article are briefly characterized telecommunication single mode optical fibers, which may be used in the construction of the sensors using magneto-optical Faraday effect. In this paper are presented the results of simulation studies, which focused on designing of single mode optical fibers. In this study, the general conclusions regarding the material properties of oxide glass, the geometrical and propagation properties of optical fibers are formulated.

2

Performance analysis of optimized non-zero dispersion shifted fiber without amplification and without dispersion compensation for wavelength division multiplexing optical networks

Priya R., Sivanantharaja A., Selvendran S.

Optica Applicata

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2015

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Vol. 45, nr 4

473--490

EN

In this paper, we have analyzed the performance of our optimized non-zero dispersion shifted fiber with three different test fibers, namely, single mode fiber, conventional non-zero dispersion shifted fiber and dispersion shifted fiber. While comparing the performances of those fibers, our optimized non-zero dispersion shifted fiber has yielded a better quality factor of 5.24 at 2.5 Gbit/s for long haul fiber length of 120 km in the absence of amplification and dispersion compensation. In order to measure the nonlinear impairments of wavelength division multiplexing channel, the quality factor values are measured at the sample channel 193.1 THz for 150 km lengthed fiber with peak input power of 6 dBm. Due to a very large effective area of optimized non-zero dispersion shifted fiber, it delivers a better quality factor of 6.12 compared to the other test fibers. We have also carried out the analysis for higher bitrates and different modulation formats at the transmission end. More phase encoded modulations of carrier-suppressed return-to-zero–differentiated phase shift keying and carrier-suppressed return-to-zero–differential quadrature phase shift keying offered optimum performances for a distance of 120 km at 10 Gbit/s bitrate. By including optical amplifiers, we could achieve a record fiber transmission length of 4000 km at the bitrate of 2.5 Gbit/s which can help the future wavelength division multiplexing optical networks to a great extent.

3

An optimized design for non-zero dispersion shifted fiber with reduced nonlinear effects for future optical networks

Raja A S, Selvendran S, Priya R, Mahendran C

Optica Applicata

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2014

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Vol. 44, nr 4

503--519

EN

Accommodation of many channels in dense wavelength division multiplexing networks raises the average power density of the optical networks. This results in severe nonlinear effects in the optical networks. An optimized design of non-zero dispersion shifted fiber with an enormous effective area can overcome this nonlinear effect and also offer a minimum bending loss and splice loss for a dense wavelength division multiplexing system. In this paper, the alpha-peak profile is utilized for calculating electrical field distribution and designing the refractive index profile of the non-zero dispersion shifted fiber. This fiber has a high effective area of about 120 μm2. Conjointly, the accomplished fiber has a very low bending loss of 1.40×10–14 dB/km and reduced splice loss of 4.46×10–3 dB. Due to this high effective area, the dense wavelength division multiplexing network performance is upgraded by diminishing nonlinear effects. In addition, the newly designed fiber has also a very low dispersion slope (0.057 ps/nm2km). Thus, the proposed fiber is optimized to handle high bandwidth and multiple high bit-rate wavelength channels without nonlinear impairments in the 1.55 μm window long-haul dense wavelength division multiplexing systems.

4

Analysis of loss and single-modality of thermally diffused areas in spliced joints of single mode telecommunication fibers

Ratuszek M., Zakrzewski Z., Majewski J., Ratuszek M.

Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy

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2011

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z. 14

33-45

EN

In this work diffusion processes in thermally connected cylindrical fibers with weakly guiding and circular cross-section, that is telecommunication fibers, have been presented. There have been discussed diffusion distributions of the core dopant of fibers spliced in . Gaussian approximations of the core dopant concentration distribution and refractive index in the connecting area of single mode telecommunication fibers have been presented. Theoretical analysis of propagation and loss characteristics for thermally diffused expanded-core (TEC) of single mode telecommunication fibers has been performed, as well. It has been shown that because Gaussian profile approximates well diffusion distribution, this thermally diffused core area (splice) remains single-modal.

PL

W pracy przedstawiono procesy dyfuzji zachodzące w termicznie łączonych jedno-modowych włóknach o słabym prowadzeniu i przekroju kołowym, tj. jednomodowych światłowodach telekomunikacyjnych. Przeanalizowano dyfuzyjne rozkłady koncentracji domieszek rdzeniowych w tychże światłowodach spawanych w temperaturze . Zaprezentowano gaussowskie aproksymacje rozkładów koncentracji domieszek rdzeniowych oraz współczynnika załamania w obszarze łączenia włókien. Przeprowadzono teoretyczną analizę propagacji i tłumienia światła w termicznie rozdyfundowanych obszarach rdzeni (TEC) jednomodowych światłowodów telekomunikacyjnych. Wykazano, że ponieważ profil gaussowski dobrze aproksymuje rozkład dyfuzyjny domieszki rdzeniowej to rozdyfundowany obszar rdzenia (spawu) pozostaje jednomodowy po dyfuzji - procesie termicznego łączenia.

5

Loss analysis of single mode telecommunication fiber thermally-diffused core areas.

Ratuszek M.

Optica Applicata

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2007

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Vol. 37, nr 3

279-294

EN

In this work, diffusion processes in thermally connected cylindrical fibers with weakly guiding and circular cross-section, that is, telecommunication fibers, have been presented. There have been discussed diffusion distributions of the core dopant of fibers spliced at T 2000 deg. C. Gaussian approximations of the core dopant concentration distribution and refractive index in the connecting area of single mode telecommunication fibers have been presented. Theoretical analysis of propagation and loss characteristics for thermally-diffused expanded core (TEC) of single mode telecommunication fibers has been performed, as well. Consistence of theoretical calculation results with experimental data, achieved on the basis of connecting telecommunication fibers with significantly different parameters, has been proved.