Precise optical spectrum analysis with high resolution by an economical and reliable device is of much interest in optical science and technology. In this work, we propose a silicon-photonic integrated optical spectrum analyzer comprised of two cascaded filters. A first ring resonator stage selects multiple ultra-narrow spectral bands of equal spacing. The set of bands may be scanned across the spectrum of interest through thermal tuning. A second filter stage separates the multiple sampled bands into different output ports. The free spectral ranges of the two stages are matched. The spectrum is reconstructed using simple, low bandwidth photodiodes. In a proof of concept experiment, the proposed integrated optical spectrum analyzer shows a wide operational range with 128MHz resolution.
|Number of pages||4|
|Journal||IEEE Photonics Technology Letters|
|State||Published - 1 Sep 2020|
Bibliographical noteFunding Information:
Manuscript received June 15, 2020; revised July 14, 2020; accepted July 20, 2020. Date of publication July 23, 2020; date of current version August 3, 2020. This work was supported in part by the Deutsche Forschungsgemein-schaft (DFG, German Research Foundation) under Grant SCHN 716/15-2, Grant SCHN 716/20-1, Grant SCHN 716/21-1, SCHN 716/22-1, and Grant SCHN 716/23-1, in part by the Israel Science Foundation under Grant 1665/14, and in part by the Israel Innovation Authority through PETA CLOUD Consortium, MAGNET Program. (Corresponding author: Arijit Misra.) Arijit Misra, Stefan Preußler, and Thomas Schneider are with the THz Photonics Group, Technische Universität Braunschweig, 38106 Braunschweig, Germany (e-mail: firstname.lastname@example.org; stefan.preussler@ ihf.tu-bs.de; email@example.com).
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- Silicon photonics
- optical communication
- optical filter
- optical spectrum analyzer
- photonic integrated circuits
- ring resonators