Microring Optical Phase-Shifters With Low Driving-Voltage, Low Insertion Loss, and Small Residual Amplitude Modulation

Rui Lin Chao, Zohauddin Ahmad, Jason Chen, Yinchieh Lai, Yung Hung, Jin Wei Shi

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Novel microring based optical phase-shifters on Siphotonic platforms for microwave photonic applications are demonstrated. By using an add-drop microring structure in combination with an additional multimode interferometer (MMI), pure phase modulation with an ultrahigh modulation efficiency can be realized. Comparison is made to the reference all-pass ring design with both the same radius (5 μm) and coupling coefficient (κ: ∼0.2). The demonstrated structure minimizes the residual amplitude modulation (0.9 vs. 1.8 dB) for nearly 2π phase shifting over a wide optical window (1520 to 1570 nm) at the expense of a larger insertion loss (0.06 dB) due to the additional MMI. The demonstrated phase shifter structure is implemented in a Mach- Zehnder interferometer (MZI) for further study of its dynamic and linearity performance. Under forward bias, it exhibits a low Vπ/Iπ(0.4 V/12.7 mA), fast rise-time (3 ns), low insertion loss (0.2 dB), low residue-amplitude-modulations (<0.9 dB), and can cover wide optical windows (1560-1568 nm) with a small footprint (37×37μm2). Themeasured spurious-free dynamic range (SFDR: 70-75 dB) of our novel phase shifter-based MZI is comparable to that of the traditional traveling-wave MZI (∼75 dB) under reverse bias and tested using the same setup.

Original languageEnglish
Pages (from-to)7740-7747
Number of pages8
JournalJournal of Lightwave Technology
Volume39
Issue number24
DOIs
StatePublished - 15 Dec 2021

Keywords

  • Optical phase shifter
  • silicon on insulator technology.

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