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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 9 — May. 6, 2013
  • pp: 10903–10916

Efficient wavelength multiplexers based on asymmetric response filters

Mark T. Wade and Miloš A. Popović  »View Author Affiliations


Optics Express, Vol. 21, Issue 9, pp. 10903-10916 (2013)
http://dx.doi.org/10.1364/OE.21.010903


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Abstract

We propose integrated photonic wavelength multiplexers based on serially cascaded channel add-drop filters with an asymmetric frequency response. By utilizing the through-port rejection of the previous channel to advantage, the asymmetric response provides optimal rejection of the adjacent channels at each wavelength channel. We show theoretically the basic requirements to realize an asymmetric filter response, and propose and evaluate the possible implementations using coupled resonators. For one implementation, we provide detailed design formulas based on a coupled-mode theory model, and more generally we provide broad guidelines that enumerate all structures that can provide asymmetric passbands in the context of a pole-zero design approach to engineering the device response. Using second-order microring resonator filter stages as an example, we show that the asymmetric multiplexer can provide 2.4 times higher channel packing (bandwidth) density than a multiplexer using the same order stages (number of resonators) using conventional all-pole maximally-flat designs. We also address the sensitivities and constraints of various implementations of our proposed approach, as it affects their applicability to CMOS photonic interconnects.

© 2013 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(250.5300) Optoelectronics : Photonic integrated circuits
(130.7408) Integrated optics : Wavelength filtering devices

ToC Category:
Integrated Optics

History
Original Manuscript: February 27, 2013
Revised Manuscript: April 20, 2013
Manuscript Accepted: April 22, 2013
Published: April 26, 2013

Citation
Mark T. Wade and Miloš A. Popović, "Efficient wavelength multiplexers based on asymmetric response filters," Opt. Express 21, 10903-10916 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-9-10903


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