arXiv subjects

Christopher R. Doerr

Publications and source records attributed to Christopher R. Doerr.

3 recordsLinked to original sources

arXiv2023

Custom Arrayed Waveguide Gratings with Improved Performance

Arrayed waveguide gratings (AWGs) are key optical components of various new applications in telecommunication, astrology, medical imaging, and spectroscopy. It is a very powerful integrated light dispersion technology with significant flexibility for tailoring its performance to the individual system needs of each application. There are several examples of custom AWG designs in the literature aiming for improved system performance. In this review, we will provide an overview of the available methods for improving the bandwidth, spectral resolution, and transmission function shape of AWGs. The working principle as well as the advantages and disadvantages of each method will be discussed.

physics.optics↗

arXiv2013

Comment on "Linear and passive silicon optical isolator" in Scientific Reports 2, 674

Wang et al. [1] demonstrated different power transmission coefficients for forward and backward propagation in simulation and experiment. From such a demonstration, the central claim of their paper is that "the spatial inversion symmetry breaking diode can construct an optical isolator in no conflict with any reciprocal principle". Their claim contradicts the Lorentz reciprocity theorem, from which it is well known that one cannot construct an isolator this way.

physics.optics↗

arXiv2011

Comment on "Nonreciprocal Light Propagation in a Silicon Photonic Circuit" in Science 333, 729-733 (2011)

In the recent article by Feng et al. [Science 333, 729-733 (2011)] a system is proposed with a periodic spatial modulation of refractive index and absorption. It is claimed that this system is nonreciprocal and can be used as an optical isolator. The authors use an unconventional definition of reciprocity and thus make wrong conclusions on the applicability of the described phenomena for optical isolators. (Submitted to Science on October 7, 2011)

physics.optics↗