Improving the self-imaging in multimode interference (MMI) couplers

• Autorzy: Yin R.
• Języki publikacji: EN

Abstrakty

EN

A new structure is firstly proposed to be used as the multimode interference (MMI) region in this paper. For comparison with conventional MMI region, two extra layers with thin thickness and lower index beside the core layer are introduced to increase the difference of propagation constant between the first two modes. Meanwhile, high order modes are not affected so much. Thus the propagation constant errors of the guided modes are decreased and better self-imaging is realized. The designing process is also given in this paper. This new structure can be applied to any kind of M×N MMI couplers. By incorporating this new structure, an MMI based power splitter is 1/6 shorter and contrast of MMI optical switch is 10 dB higher according to the results of exact mode analysis.

Słowa kluczowe

EN

integrated optics; multimode interference (MMI); self-imaging

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Optica Applicata
• Rocznik: 2011
• Tom: Vol. 41, nr 3
• Strony: 679--685
• Opis fizyczny: Bibliogr. 8 poz.

Twórcy

autor

Yin R.

• College of Information Science and Engineering, Shandong University, Jinan, Shandong, China 250100

Bibliografia

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• [3] PAIAM M.R., MACDONALD R.I., Polarisation-insensitive 980/1550 nm wavelength (de)multiplexer using MMI couplers, Electronics Letters 33(14), 1997, pp. 1219–1220.
• [4] LORENZO R.M., LLORENTE C., ABRIL E.J., LOPEZ M., Improved self-imaging characteristics in 1×N multimode couplers, IEE Proceedings Optoelectronics 145(1), 1998, pp. 65–69.
• [5] HUANG J.Z., SCARMOZZINO R., OSGOOD R.M., A new design approach to large input/output-number multimode interference couplers and its application to low-crosstalk WDM routers, IEEE Photonics Technology Letters 10(9), 1998, pp. 1292–1294.
• [6] YIN R., YANG J., JIANG X., LI J., WANG M., Improved approach to low-loss and high-uniformity MMI devices, Optics Communications 181(4–6), 2000, pp. 317–321.
• [7] YIN R., JIANG X., YANG J., WANG M., Structure with improved self-imaging in its graded-index multimode interference region, Journal of the Optical Society of America B 19(6), 2002, pp. 1301–1303.
• [8] THOEN E.R., MOLTER L.A., DONNELLY J.P., Exact modal analysis and optimization of N×N×1 casaded waveguide structures with multimode guiding sections, IEEE Journal of Quantum Electronics 33(8), 1997, pp. 1299–1307.