Novel compact polarization converters based on ultra short bends

Abstract

Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Dam, van, C., Spiekman, L. H., Ham, van, F. P. G. M., Groen, F. H., Tol, van der, J. J. G. M., Moerman, I., ... Smit, M. K. (1996). Novel compact polarization converters based on ultra short bends. IEEE Photonics Technology Letters, 8(10), 1346-1348. General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Modal behavior of single-line photonic crystal guiding structures on InP substrate

“…The scattering process at the bend is also responsible for this different behavior: the W3 PCW is a wide guide and even being excited on its fundamental mode, a large number of modes exist in the bend section. For some of these modes, polarization conversion occurs due to the continuity conditions, in the same way as it does in purely index-guided sharp bends [10]. In the case of the W1 PCW, we have already seen that a very reduced number of modes exist in the bend section (two in the u = 0.28 domain), so that polarization conversion is limited.…”

“…Polarisation conversion is a severe drawback of index-guided sharp bends [10], and will always limit the size reduction of photonic integrated circuits based on the classical index-contrast guiding mechanism. Here, we also present measurements on PCW W1-based sharp bends, which demonstrate that polarization conversion is suppressed to better than 17 dB.…”

Numerical Study on Fabrication Tolerance of Half-Ridge InP Polarization Converters

“…Various types of PCs have been demonstrated to date; those based on periodic loaded waveguides [5], microbended waveguides [6], adiabatic waveguides [7]- [10], and asymmetric waveguides [11]- [19]. The asymmetric PCs are suitable for monolithic integration with InP photonic devices as well as their short operating length and relatively small sensitivity against the deviation of the wavelength and the temperature.…”

Relaxed Dimensional Tolerance Whispering Gallery Microbends

“…This is readily achieved with deeply etched waveguides [13]- [16] and has been exploited in ultracompact arrayed waveguide gratings [17], [18]. Performance does, however, become increasingly sensitive to waveguide bend modal properties, fabrication tolerance, and polarization rotation, leading even to a body of research on polarization converters [19]- [21]. To reduce bend radii even further toward the micrometer level, researchers have considered high refractive index contrast in both vertical and horizontal waveguiding planes to also minimize substrate losses.…”