Abstract
In this paper, ultrahigh-Q factor racetrack microring resonators (MRRs) are demonstrated based on silica planar lightwave circuits (PLCs) platform. A loaded ultrahigh-Q factor Qload of 1.83 × 106 is obtained. The MRRs are packaged with fiber-to-fiber loss of ~5 dB. A notch depth of 3 dB and ~137 pm FSR are observed. These MRRs show great potential in optical communications as filters. Moreover, the devices are suitable used in monolithic integration and hybrid integration with other devices, especially in external cavity lasers (ECLs) to realize ultranarrow linewidths.
Highlights
With the development of ultrahigh-speed optical interconnection, coherent optical communication [1,2,3], and coherent detection technology [4,5,6,7], more urgent requirements are put forward for the narrow linewidth, high power, and high stability of laser source
Silica planar lightwave circuits (PLCs) are attractive for external cavity lasers (ECLs) owing to its high mechanical strength, high thermal stability, low loss, and almost the same core geometry with fiber cores, which is suitable for an optical communication system
The microring resonators (MRRs) are well packaged with fiber-to-fiber loss of ~5 dB and can be used directly
Summary
With the development of ultrahigh-speed optical interconnection, coherent optical communication [1,2,3], and coherent detection technology [4,5,6,7], more urgent requirements are put forward for the narrow linewidth, high power, and high stability of laser source. Low bend loss means high Q factor, but small FSR will limit. Taking the balance between these parameters, we Photonics 2021, 8, 43 select m to be 9519 In this case, from Equation (4) we can estimate the ring radius R3 iosf 9. Loss of dB/cm is Figure 3 shows the relations between transmission efficiency and bend radius. Low bend loss means high Q factor, but small FSR will limit the applications—for example, the port number of wavelength division multiplex (WDM). Low bend loss means high Q factor, but small FSR will limit the applications—for example, the port number of wavelength division multiplex (WDM) systems and working range of sensors. Taking the balance between these parameters, we select m to be 9519 In this case, from Equation (4) we can estimate the ring radius R is 1600 μm, and FSR to be 161 pm.
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