Add-drop multiplexing by dispersion inverted interference coupling

• Published in: Journal of lightwave technology Vol. 20; no. 8; pp. 1585 - 1589
• Main Authors: Aslund, M., Poladian, L., Canning, J., de Sterke, C.M.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.08.2002; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Australia; Bragg gratings; Canning; Circuit properties; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Information, signal and communications theory; Integrated optics. Optical fibers and wave guides; Interference; Manufacturing; Multiplexing; Optical and optoelectronic circuits; Optical fiber couplers; Optical fiber devices; Optical interferometry; Optical waveguides; Signal and communications theory; Telecommunications and information theory; WDM networks; Optical telecommunication; Couplers; wavelength-division multiplexing; Bragg grating; Wavelength division multiplexing; Multimode waveguide; Optical coupler; Experimental result; multimode waveguides; Optical multiplexer; gratings; Optical waveguide; Modal dispersion
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2002.800355

We demonstrate experimentally a previously proposed add-drop multiplexer in a two-moded structure with a symmetric Bragg grating. The strong dispersion in the forward direction outside the reflective region of the grating is used to create a phase change for frequencies between the bandgaps of the supermodes of a twin core fiber. The phase change in transmission inverts the interference pattern at the end of the device. Signals within a narrow wavelength range couple out to one core; all other wavelengths couple out to the opposite core. Preliminary experimental results show a crosstalk ratio of 15 dB.