Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 38,
  • Issue 16,
  • pp. 4454-4461
  • (2020)

Integrated Arbitrary Filter With Spiral Gratings: Design and Characterization

Not Accessible

Your library or personal account may give you access

Abstract

We report the design and characterization of a high performance integrated arbitrary filter from 1450 to 1640 nm. The filter's target spectrum is chosen to suppress the night-sky OH emission lines, which is critical for ground-based astronomical telescopes. This type of filter is featured by its large spectral range, high rejection ratio, and narrow notch width. Traditionally it is only successfully accomplished with fiber Bragg gratings. The technique we demonstrate here is proven to be very efficient for on-chip platforms, which can bring many benefits for device footprint, performance, and cost. For the design part, two inverse scattering algorithms are compared, the frequency domain discrete layer-peeling (f-DLP) and the time domain discrete layer-peeling (t-DLP). f-DLP is found to be superior for the grating reconstruction in terms of accuracy and robustness. A method is proposed to resolve the non-uniformity issue caused by the non-zero layer size in the DLP algorithm. The designed 55-notch filter is 50-mm-long and implemented on a compact Si3N4/SiO2 spiral waveguide with a total length of 63 mm. Experimentally, we demonstrate that the device has a insertion loss as low as 2.5 dB, and that the waveguide propagation loss is as low as 0.10 dB/cm. We are also able to achieve uniform notch depths and 3-dB widths of about 28 dB and 0.22 nm, respectively.

PDF Article
More Like This
Integrated Bragg gratings in spiral waveguides

Alexandre D. Simard, Yves Painchaud, and Sophie LaRochelle
Opt. Express 21(7) 8953-8963 (2013)

Add–drop filter with complex waveguide Bragg grating and multimode interferometer operating on arbitrarily spaced channels

Shengjie Xie, Jiahao Zhan, Yiwen Hu, Yang Zhang, Sylvain Veilleux, Joss Bland-Hawthorn, and Mario Dagenais
Opt. Lett. 43(24) 6045-6048 (2018)

Design and characterization of whispering-gallery spiral waveguides

Tong Chen, Hansuek Lee, and Kerry J. Vahala
Opt. Express 22(5) 5196-5208 (2014)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved