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Widely Tunable Coupled-ring Reflector Laser Diode Consisting of Square Ring Resonators
Suhyun Kim,변영태,Doo-Gun Kim,Nadir Dagli,정영철 한국광학회 2010 Current Optics and Photonics Vol.14 No.1
We design and fabricate a widely tunable laser diode made of InGaAsP-InP. The diode is monolithically integrated with a wavelength-selective coupled-ring reflector and semiconductor amplifiers. For realization of a compact size device, deeply etched multi-mode interference couplers and square ring resonators composed of total-internal-reflection mirrors are adopted and fabricated using a self-aligned process. It is demonstrated that the laser diode exhibits single mode operation and 16 nm tuning range with side-mode-suppression-ratio exceeding 20 dB.
Extremely small multimode-interference coupled triangular resonator with sharp angle of incidence
Kim, Doo Gun,Oh, Geum-Yoon,Choi, Woon-Kyung,Kim, Hyo Jin,Kim, Seon Hoon,Ki, Hyun Chul,Kim, Sang-Taek,Ko, Hang Ju,Kim, Tae Un,Yang, Myoung Hak,Kim, Hwe Jong,Yi, Jong Chang,Chung, Youngchul,Dagli, Nadir The Optical Society 2008 Optics express Vol.16 No.25
<P>Novel triangular ring resonators combining extremely small multimode-interference (MMI) coupler, low loss total internal reflection (TIR) mirrors, and semiconductor optical amplifiers are reported for the first time. The MMI length of 90 microm is among the shortest reported. The incidence angle of the TIR mirror inside the resonator is 22 degrees. A free-spectral range of approximately 2 nm is observed near 1550 nm along with an on-off ratio of 17 dB. The triangular resonators with a sharp angle are very attractive components due to their promise of compact size and high levels of integration. Therefore, large numbers of resonators can be integrated on a chip to increase functionality in future optical wavelength division multiplexing system.</P>