Shasha Liao, Junxian Wu. Silicon-Based Optical Flat-Top Filter with Ultrahigh Shape Factor[J]. Acta Optica Sinica, 2024, 44(7): 0723001
- Acta Optica Sinica
- Vol. 44, Issue 7, 0723001 (2024)
Fig. 1. Schematic of on-chip flat-top filter
Fig. 2. Simulated spectra of flat-top filter under different
Fig. 3. Top view and related structure parameters of on-chip flat-top filter
Fig. 4. Simulated spectra of flat-top filter under different g. (a) Output spectra of out1 port under different g; (b) spectra of the two output ports when g=0.25 μm; (c) enlarged view of the spectrum of out1 port
Fig. 5. Metallographic micrograph of proposed flat-top filter. (a) Whole filter; (b) symmetrical 2×2 MMI; (c) all-pass RMRR
Fig. 6. Experimental spectra of flat-top filter when there is no temperature change. (a) Spectra of the two output ports; (b) enlarged view of the spectrum of out1 port
Fig. 7. Relationship between voltage and temperature
Fig. 8. Output spectra of flat-top filter when heating temperature changes. (a) 0-6.31 ℃; (b) 6.31-18.53 ℃; (c) 18.53-36.81 ℃; (d) 36.81-54.49 ℃
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Table 1. Relationship between redshift of central wavelength and voltage
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