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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 14 — Jul. 15, 2013
  • pp: 17042–17052

High precision wavelength estimation method for integrated optics

R. M. Oldenbeuving, H. Song, G. Schitter, M. Verhaegen, E. J. Klein, C. J. Lee, H. L. Offerhaus, and K.-J. Boller  »View Author Affiliations


Optics Express, Vol. 21, Issue 14, pp. 17042-17052 (2013)
http://dx.doi.org/10.1364/OE.21.017042


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Abstract

A novel and simple approach to optical wavelength measurement is presented in this paper. The working principle is demonstrated using a tunable waveguide micro ring resonator and single photodiode. The initial calibration is done with a set of known wavelengths and resonator tunings. The combined spectral sensitivity function of the resonator and photodiode at each tuning voltage was modeled by a neural network. For determining the unknown wavelengths, the resonator was tuned with a set of heating voltages and the corresponding photodiode signals were collected. The unknown wavelength was estimated, based on the collected photodiode signals, the calibrated neural networks, and an optimization algorithm. The wavelength estimate method provides a high spectral precision of about 8 pm (5·10−6 at 1550 nm) in the wavelength range between 1549 nm to 1553 nm. A higher precision of 5 pm (3·10−6) is achieved in the range between 1550.3 nm to 1550.8 nm, which is a factor of five improved compared to a simple lookup of data. The importance of our approach is that it strongly simplifies the optical system and enables optical integration. The approach is also of general importance, because it may be applicable to all wavelength monitoring devices which show an adjustable wavelength response.

© 2013 OSA

OCIS Codes
(120.4140) Instrumentation, measurement, and metrology : Monochromators
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(130.3120) Integrated optics : Integrated optics devices
(140.4780) Lasers and laser optics : Optical resonators

ToC Category:
Integrated Optics

History
Original Manuscript: April 11, 2013
Revised Manuscript: May 27, 2013
Manuscript Accepted: June 3, 2013
Published: July 10, 2013

Citation
R. M. Oldenbeuving, H. Song, G. Schitter, M. Verhaegen, E. J. Klein, C. J. Lee, H. L. Offerhaus, and K.-J. Boller, "High precision wavelength estimation method for integrated optics," Opt. Express 21, 17042-17052 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-14-17042


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