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1
Content available Numerical analysis of planar multimode optical sensor with active nanolayer
Błahut Marek
Optica Applicata
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2020
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Vol. 50, nr 3
377--390
EN
In the paper, numerical studies of the model of an optical sensor, based on interference of modes in a planar one-dimensional step-index configuration, are presented. Calculations are performed using the method of mode field analysis. The structure consists of the single-mode input waveguide, the multimode waveguide that guides only a few modes and the single-mode output waveguide.The structure is covered by a nanometer active sensor layer of a high refractive index, which changes its optical properties in contact with the measured external surrounding. The refractive index variation of an active sensor layer affects the modal properties of the multimode waveguide and the output optical field distribution. By the proper selection of the active layer, the considered configuration can be used for gas detection.
2
Content available remote Model czujnika światłowodowego na bazie wielomodowych struktur interferencyjnych
Szewczuk A., Błahut M.
Prace Naukowe Politechniki Śląskiej. Elektryka
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2015
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z. 2
55--62
PL
W pracy został zaprezentowany model czujnika światłowodowego na bazie wielomodowych struktur interferencyjnych. Analizowano teoretycznie struktury o gradientowym profilu współczynnika załamania uzyskanym w procesie wymiany jonowej K-Na. Przeprowadzoną analizę wykonano opierając się na numerycznej metodzie propagacji światła BPM (ang. beam propagation method). Otrzymane wyniki wykazują, że zmiana parametrów pokrycia sekcji MMI prowadzi do zmiany natężenia sygnału wyjściowego.
EN
Model of sensor based on multimode interference structures is presented in the paper. The gradient index waveguide structures obtained in the K-Na ion-exchange process are analyzed theoretically. Analysis were carried out on the basis of a BPM method (beam propagation method). The obtained results show that changes of MMI section cladding parameters lead to changes in the output signal intensity.
3
Content available remote Design and performance analysis of InP/InGaAsP-MMI based 1310/1550-nm wavelength division demultiplexer with tapered waveguide geometry
Chack D., Kumar V., Raghuwanshi S. K.
Opto-Electronics Review
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2015
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Vol. 23, No. 4
271-277
EN
The design and performance analysis of a 1310/1550-nm wavelength division demultiplexer with tapered geometry based on InP/InGaAsP multimode interference (MMI) coupler has been carried out. Wavelength response of demultiplexer of conventional MMI and tapered input and tapered output (tapered I/O) waveguides geometry of the MMI have been discussed. The demultiplexing function has been first performed by choosing a suitable refractive index of the guiding region and geometrical parameters such as the width and length of MMI structure have been achieved. Access width of tapered I/O waveguides have been adjusted to give a low insertion loss (IL) and high extinction ratio (ER) for the considered wavelengths of 1310 nm and 1550 nm. The total size of the demultiplexer has been significantly reduced over the existing MMI devices. Numerical simulations with finite difference beam propagation method are applied to design and optimize the operation of the proposed demultiplexer.
4
Content available Polarization effects in K+–Na+ ion exchanged MMI structures with absorption cover
Szewczuk A., Blahut M.
Optica Applicata
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2013
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Vol. 43, nr 3
441--452
EN
The paper concerns the polarization effects in gradient index MMI sensor structures made by ion K+–Na+ exchange. It has been shown both experimentally and based on the numerical calculation that for the K+–Na+ ion exchanged MMI structures, propagation conditions of light in multimode section vary considerably for each polarization. There are presented the possibilities of using this effect in application to gas sensing. Analyzed sensor structures are covered by WO3 absorbing nanolayers. Numerical analyses of MMI sensor are performed and modal attenuation coefficients are determined. The comparison between operation characteristics obtained for the TE and TM polarization is presented.
5
Content available remote A proposal for 1×8 all-optical switch using multimode interference
Bahrami A., Rostami A.
Optica Applicata
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2011
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Vol. 41, nr 1
165--172
EN
We propose an eight-channel all-optical switch using a multimode interference phenomenon. This structure is based on the cooperation of self imaging and self guiding in nonlinear multimode interference. The switching operation is done with changing the intensity of the input signal. To the best of our knowledge, this is for the first time that a 1×8 all-optical switch is presented based on a continuous multimode interference region. Simulation results show low crosstalk and high efficiency in the output profiles. The mean values of the crosstalk and the insertion losses in eight states of the switching operation are -33.8 dB and -0.16 dB, respectively. Full-vectorial beam propagation method is used for the simulation of the device.
6
Content available remote Multimode interference wavequide structures made by ion exchange in glass and their applications in passive elements technology
Błahut M.
Opto-Electronics Review
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2001
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Vol. 9, No. 3
356-358
EN
In the paper we presented numerical studies of gradient index optical splitters made in a multimode inference technology by K+ - Na+ ion exchange process. The influence of geometrical parameters of multimode interference structure and technological process parameters is examined in numerical simulations and gradient index optical wavequide splitters are proposed for photonic applications.
7
Content available remote Multimode interference structures : new way of passive elements technology for photonics
Błahut M., Opilski A.
Opto-Electronics Review
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2001
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Vol. 9, No. 3
293-300
EN
The aim of this work is presentation of principles of work and properties of multimode interference (MMI) structures and their basic applications in optoelectronic circuits. We discuss the principles of simple, mirrored and multiple images formation paying attention to imaging quality, tolerance, losses, and power division in output signals. On the base of it, MMI applications in integrated optic systems - in splitters and couplers NxM technology, modulators and switches in Mach-Zehnder configuration and multiplexers are considered. The possibility of MMI production in gradient-index wavequides made by ion exchange in glass is also presented.
8
Content available remote Optical waveguide splitters based on multimode interference structures made by ion exchange in glass.
Blahut M.
Optica Applicata
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2000
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Vol. 30, nr 2-3
401-413
EN
In the paper, numerical studies of gradient index optical splitters made using a multimode interference technology are presented. Multimode interference structures produced in K/sup +/ to or from Na/sup +/ and Ag/sup +/ to or from Na/sup +/ ion exchange processes have been compared. The influence of geometrical parameters of multimode interference structure and technological process parameters is examined in numerical simulations. Based on the above, gradient index optical waveguide splitters and Mach-Zehnder interferometers in multimode interference configuration are proposed.
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