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We investigate and demonstrate the thermal crosstalk problem in integrated photonic circuits with metal and silicon doped heaters. Further, we illustrate that due to the localized heating effect, integrated doped heaters are out-performed in terms of thermal crosstalk as compared to integrated metal heaters. To mitigate thermal crosstalk and enhance phase tuning efficiency further, a CMOS compatible air-filled trench region is realized between the doped heater and the adjacent element. The performances of three fundamental building blocks of integrated photonic circuits, namely, a PN phase shifter, an optical attenuator, and a ring resonator, are tested by full-wave thermal, charge, and optical simulations. Additionally, the impact of thermal crosstalk on the performance of integrated PN phase shifters and optical attenuators is examined thoroughly. The proposed low crosstalk thermal phase shifters might be very beneficial for densely routed complex integrated photonic circuits like photonic transceivers for data centers, optical phased array antennas, and photonic reservoirs. INDEX TERMS Silicon on insulator (SOI), thermal crosstalk, phase shifter, integrated doped heaters, integrated optical attenuator, thermal switch, ring resonator.

A compact spurious free, quad‐band, band‐pass filter (BPF) having independently controllable and widely spaced frequency bands is proposed. The design consists of a basic BPF to which the authors introduce transmission zeros (TZs) in the frequency response using T‐shaped stubs loaded with a modified ring resonator (MRR) thereby creating the four passbands. This design results in very high band‐to‐band isolation. The TZs are obtained by transversal signal path cancellation and also due to the loaded T‐shaped stubs. The BPF consists of a stepped impedance low‐pass filter which provides spurious free out of band characteristics up to 20GHz. By changing the tapping position of the MRR, the frequencies of the TZs can be adjusted to get the desired pass band characteristics. The proposed quad‐band filter provides low‐insertion loss (<1dB) at the four passbands centred at 2.4, 5.1, 7.7 and 10.1GHz. The simulation results of the filter are verified experimentally.

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