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Ultra-Broadband Add-Drop Filter/Switch Circuit Using Subwavelength Grating Waveguides
R. Sumi, Ramesh K. Gupta, ,
Published in Institute of Electrical and Electronics Engineers Inc.
2018
Volume: 25
   
Issue: 3
Abstract
An ultrabroadband add-drop filter/switch circuit is designed and demonstrated by integrating a pair of subwavelength grating waveguides in a 2\times 2 Mach-Zehnder interferometer configuration using silicon photonics technology. The subwavelength grating is designed such that its stopband and passband are distinguished by a band-edge wavelength \lambda -{\text{edge}} \sim1565 nm, separating C and L bands. The stopband (\lambda < lambda {\text{edge}}) is filtered at the drop port of the device, whereas the passband ( \lambda >\lambda -{\text{edge}}) is extracted either in cross port or in bar port. The device is designed to operate only in TE polarization. Experimental results exhibit a nearly flat-Top band exceeding 40 nm for both stopband and passband. The stopband extinction at cross-and bar ports are measured to be > 35 dB with a band-edge roll-off exceeding 70 dB/nm. Wavelength independent directional coupler design and integrated optical microheaters at different locations of the Mach-Zehnder arms for thermo-optic phase detuning are the key for stopband filtering at the drop port and switching of passband between cross-and bar ports with flat top response. Though the insertion loss of fabricated subwavelength grating waveguides are negligibly small, the observed passband insertion loss is \sim 2 dB, which is mainly due to the combined excess loss of two directional couplers. Experimental results also reveal that the passband switching between cross-and bar ports of the device has been possible with an extinction of >15 dB by an electrical power consumption of P-\pi \sim 54 mW. A switching time of 5 \mus is estimated by analyzing the transient response of the device. The passband edge could also be detuned thermo-optically at a rate of 22 pm/mW. © 1995-2012 IEEE.
About the journal
JournalData powered by TypesetIEEE Journal of Selected Topics in Quantum Electronics
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
ISSN07921233
Open AccessNo
Concepts (24)
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    Bandpass filters
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    Diffraction gratings
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    Directional couplers
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    Drops
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    Insertion losses
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    Integrated optics
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    MACH-ZEHNDER INTERFEROMETERS
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    Optical resonators
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    Optical switches
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    Optical waveguides
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    Photonic devices
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    Photonics
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    Silicon
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    Silicon photonics
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    Timing circuits
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    Transient analysis
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    Ultra-wideband (uwb)
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    ADD DROP MULTIPLEXERS
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    BROAD-BAND FILTERS
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    OPTICAL DEVICE FABRICATION
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    PASS BANDS
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    Sub-wave length grating
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    Thermo-optic switch
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    Waveguide filters