Abstract
Athermal and flat-topped transmissions are the two main requirements for a silicon WDM filter. A Mach-Zehnder (MZ) filter which simultaneously satisfies these two requirements has been experimentally demonstrated in this paper. A combination of strip waveguide and hybrid strip-slot waveguide is introduced for athermalization, and two-stage interference is utilized for flat-topped transmission. The temperature dependent wavelength shift is measured to be ~-5 pm/K while the best 1 dB bandwidth is 5.5 nm with 14.7 nm free spectral range (FSR). The measured minimum insertion loss is only 0.4 dB with a device dimension of 170 μm × 580 μm. Moreover, Such a MZ filter is compatible with the state-of-art CMOS-fabrication process and its minimum feature size is as large as 200 nm.
Highlights
Silicon photonic wavelength division multiplexing (WDM) is widely anticipated to solve the bandwidth bottleneck problem in nowadays high-performance computing systems [1,2]
One main requirement of a WDM filter is the flat-topped transmission pass-bands and almost all kinds of silicon WDM filters have been modified to satisfy this requirement, such as cascade for ring resonators [3,4,5,6], multimode interference (MMI) assisted aperture for Arrayed Waveguide Gratings (AWGs) [7,8,9,10], multi-stage interference for Mach-Zehnder (MZ) filters [11,12,13,14]
According to Eq (1), we find that the flat-top feature of Ch.1 can be maintained by modifying the coupling coefficients as Eq (2) for the case of a ≠ 1
Summary
Silicon photonic wavelength division multiplexing (WDM) is widely anticipated to solve the bandwidth bottleneck problem in nowadays high-performance computing systems [1,2]. One main requirement of a WDM filter is the flat-topped transmission pass-bands and almost all kinds of silicon WDM filters have been modified to satisfy this requirement, such as cascade for ring resonators [3,4,5,6], multimode interference (MMI) assisted aperture for Arrayed Waveguide Gratings (AWGs) [7,8,9,10], multi-stage interference for Mach-Zehnder (MZ) filters [11,12,13,14] All of these methods are efficient in flatting the pass-bands. We have presented some preliminary results in the 13th International Conference on Group IV Photonics [26], while the complete simulation and measurement results are analyzed here
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