Novel architecture for design of planar lightwave interleavers

This paper reports a novel architecture for the design of dense wavelength-division multiplexing interleavers based on planar echelle gratings. Double astigmatic point design of the echelle grating is discussed. The important and inherent limitation of aberrations associated with the echelle grating...

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Bibliographic Details
Published in:Journal of lightwave technology 2005-03, Vol.23 (3), p.1435-1440
Main Authors: Bidnyk, S., Balakrishnan, A., Delage, A., Mae Gao, Krug, P.A., Muthukumaran, P., Pearson, M.
Format: Article
Language:English
Subjects:
Aberration
Applied sciences
Architecture
Arrayed waveguide gratings
Channels
Coding, codes
Design engineering
Echelle gratings
Exact sciences and technology
Gratings
Information, signal and communications theory
interleaver
Multiplexing
Nonuniformity
Optical devices
Optical fiber communications
Optical filters
Optical refraction
Optical telecommunications
Optical variables control
optical waveguide filters
Optical waveguide theory
Optical waveguides
Passband
Refractive index
Refractivity
Signal and communications theory
Telecommunications
Telecommunications and information theory
Wavelength division multiplexing
wavelength-division multiplexing (WDM)
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Summary:This paper reports a novel architecture for the design of dense wavelength-division multiplexing interleavers based on planar echelle gratings. Double astigmatic point design of the echelle grating is discussed. The important and inherent limitation of aberrations associated with the echelle grating has been eliminated by the introduction of aberration free elliptical facets. A mechanism for compensating the variations of the refractive index with wavelength is also described. The theoretical analysis was used to design and manufacture remarkably low footprint 50/100 and 100/200 GHz interleavers in silica-on-silicon with the waveguide refractive index contrast of 0.62%. The comparison between the theoretical and experimental results shows an excellent agreement. The fabricated devices based on the proposed approach showed low nonuniformity in insertion loss, high dynamic range, and precise channel periodicity over the entire C band.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2004.841430