《Table 1.Performance Comparison of Several Typical Integrated ODLs》

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《Integrated optical delay lines:a review and perspective[Invited]》

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In an integrated ODL incorporating dozens of optical components，the optical power monitoring in critical paths is necessary to get the optimal performance.In silicon ODLs，all-silicon optical power detectors based on surface-state or defect-state absorption can be integrated without perturbing the optical function or bringing extra loss to the device[127–129].In addition，the resonance wavelength can be stabilized by feedback control for silicon resonators with an in-resonator photodetector[130].