Thermally tunable quadruple Vernier racetrack resonators

Abstract

The spectral responses of series-coupled racetrack resonators exhibiting the Vernier effect have many attractive features as compared to the spectral responses of identical series-coupled racetrack resonators, such as free spectral range (FSR) extension and enhanced wavelength tunability. Here we present experimental results of a thermally tunable quadruple series-coupled silicon racetrack resonator exhibiting the Vernier effect. We thermally tune two of the four racetrack resonators to enable discrete switching of the major peak by 15.54 nm. Also, our device has an interstitial peak suppression of 35.4 dB, a 3 dB bandwidth of 0.45 nm, and an extended FSR of 37.66 nm.

Picosecond optically reconfigurable filters exploiting full free spectral range tuning of single ring and Vernier effect resonators

“…in sensing [33][34][35][36]. Towards telecommunication applications, the tuning of Vernier resonators working in the first regime of the Vernier effect has been demonstrated based on the thermo-optic effect [36][37][38][39][40] and by carrier injection [41]. As indicated in Fig.…”

AutomaticWavelength Tuning of Series-Coupled Vernier Racetrack Resonators on SOI

“…By coupling resonators that have different optical path lengths, the Vernier effect can be used to increase the freespectral-ranges (FSRs) and wavelength tuning ranges achievable in microring resonator-based devices [1]. Widely tunable lasers [2], wavelength selective switches [3], and reconfigurable filters [4,5], capable of meeting numerous telecom-grade filter specifications [1], have been demonstrated on silicon photonics platforms using the Vernier effect. Tunable Vernier devices allow one to adjust the performance of the devices to address variations in fabrication, operating temperatures, and wavelength of the input laser, as well as to completely reconfigure the devices to operate at various channel wavelengths [1,5].…”

“…Widely tunable lasers [2], wavelength selective switches [3], and reconfigurable filters [4,5], capable of meeting numerous telecom-grade filter specifications [1], have been demonstrated on silicon photonics platforms using the Vernier effect. Tunable Vernier devices allow one to adjust the performance of the devices to address variations in fabrication, operating temperatures, and wavelength of the input laser, as well as to completely reconfigure the devices to operate at various channel wavelengths [1,5]. Therefore, the ability to automatically tune these devices is an essential requirement for their practical deployment.…”

Dispersion of double-slot microring resonators in optical buffer

“…Optical microring has become a research hotspot as it is used to construct lasers, filters, modulators, switches and buffers, which is conducive to on-chip system integration [1][2][3][4][5][6]. Optical buffers based on microring resonators slow down the speed of light through making light transport back and forth in special resonator structure with good flexibility and tenability [7][8][9][10].…”

“…In single-ring optical buffer, the product of delay and the delay-bandwidth have an inherent theoretical upper limit [11]. To increase the delaybandwidth, multi rings are cascaded according to the Vernier effect [2,10,12], while the device footprint would be too large as the number of rings increases. In 2006, Poon et al made a 12-ring buffer with 110-140 ps delay and 60 μm ring radius [13].…”