Fig. 2: Single-soliton/PSC spectra and their corresponding RF photonic filters.
From: Reconfigurable radiofrequency filters based on versatile soliton microcombs
Through deterministic accessing PSC states of different resonances, the RF filter passbands can be divided correspondingly. Left column: microcomb spectra (blue: experiment; red: sech2 fitting); right column: corresponding normalized RF filter responses (blue: experiment; red: simulation). a RF filter centered at 16.24 GHz based on single soliton from resonance of 1556.0 nm; b–d RF filters centered at 8.12, 5.42, and 4.06 GHz based on two , three , four times PSC, generated at resonances of 1556.0, 1554.3, and 1555.1 nm, respectively. The insets of left column illustrate soliton distribution inside the microresonator: a single-soliton; b–d equally spaced solitons (PSCs) with adjacent angles of 180°, 120°, and 90°, respectively (360°/N, N = 2, 3, 4).
