Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 33, Issue 12, Pages 607-610Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2020.3041939
Keywords
Comb filters; Optical fiber filters; Couplers; Optical switches; Erbium; Couplings; Wavelength division multiplexing; Ring-resonators; tunable couplers; comb filter; interleaver; dense wavelength division multiplexing
Funding
- National Key Research and Development Program of China [2018YFC150370-3]
- Shanghai Academy of Spaceflight Technology [SAST2019-127, XM44]
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A switchable and flexible comb filter/interleaver based on ring-resonator technology was demonstrated, utilizing tunable couplers to change phase shifts and reconfigure filter performance parameters. This innovation holds potential application in dense wavelength division multiplexing optical communication systems.
We demonstrate a switchable and flexible comb filter/interleaver based on ring-resonator (RR) in which the directional couplers are replaced by tunable couplers. The tunable coupler is composed of an even-arm-length Mach-Zehnder interferometer (MZI) with a micro-heater embedded in one of the arms. For the sake of discussion, we convert the heating power of the micro-heater into a pure phase shift value independent of the waveguide material and size. By changing the phase shift value, the filter can be switched between comb filter and interleaver. Meanwhile, the insertion loss (IL), full width at half maximum (FWHM), extinction ratio (ER), and the shape of the response spectrum can also be reconfigured. The switchable and flexible comb filter/interleaver may provide a potential application in dense wavelength division multiplexing (DWDM) optical communication systems.
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