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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 3 — Feb. 1, 2014
  • pp: 701–703

Tunable nanophotonic delay lines using linearly chirped contradirectional couplers with uniform Bragg gratings

Wei Shi, Venkat Veerasubramanian, David Patel, and David V. Plant  »View Author Affiliations

Optics Letters, Vol. 39, Issue 3, pp. 701-703 (2014)

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We demonstrate an integrated tunable optical delay line in grating-assisted contradirectional couplers using a CMOS-compatible photonic technology. The input signal is delayed through dispersive Bragg gratings and distributedly coupled to the drop port of the coupler without backreflections. This add–drop design enables monolithic integration of grating-based delay lines without using optical circulators. The gratings are formed by slab perturbations in rib waveguides, with the index chirping realized by linearly tapering the rib widths. Both the pitch and size of the gratings are constant through the entire coupler, for a higher tolerance to fabrication errors. Continuous tuning of the optical group delay of up to 96 ps has been obtained, with a low insertion loss of less than 2 dB and a negative chromatic dispersion of 11ps/nm that allows for bit rates of up to almost 100Gb/s at the maximal delay. The device has a small footprint of 0.015mm2, and can be used for on-chip optical buffering, dispersion compensation, and pulse compression.

© 2014 Optical Society of America

OCIS Codes
(200.4490) Optics in computing : Optical buffers
(250.5300) Optoelectronics : Photonic integrated circuits
(130.2035) Integrated optics : Dispersion compensation devices

ToC Category:
Integrated Optics

Original Manuscript: August 21, 2013
Revised Manuscript: November 17, 2013
Manuscript Accepted: December 10, 2013
Published: January 30, 2014

Wei Shi, Venkat Veerasubramanian, David Patel, and David V. Plant, "Tunable nanophotonic delay lines using linearly chirped contradirectional couplers with uniform Bragg gratings," Opt. Lett. 39, 701-703 (2014)

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