A self-pulsating multisection distributed-feedback laser diode (DFB LD) can potentially realize all-optical clock extraction. This device generally consists of three sections, two DFB sections and one waveguide section. The most important variable in this device is detuning, which is the relative sp...
A self-pulsating multisection distributed-feedback laser diode (DFB LD) can potentially realize all-optical clock extraction. This device generally consists of three sections, two DFB sections and one waveguide section. The most important variable in this device is detuning, which is the relative spectral position between the stop bands of two DFB sections. We fabricated a novel structure in which two gratings were located one over and one under the active layers. Each grating structure was independently defined in processing so that detuning, which is the prerequisite for self-pulsation, could be easily controlled. Observing various self-pulsating phenomena in these devices under several detuning conditions, we characterized the phenomena as dispersive Q-switching, mode beating, and self-mode-locking.
A self-pulsating multisection distributed-feedback laser diode (DFB LD) can potentially realize all-optical clock extraction. This device generally consists of three sections, two DFB sections and one waveguide section. The most important variable in this device is detuning, which is the relative spectral position between the stop bands of two DFB sections. We fabricated a novel structure in which two gratings were located one over and one under the active layers. Each grating structure was independently defined in processing so that detuning, which is the prerequisite for self-pulsation, could be easily controlled. Observing various self-pulsating phenomena in these devices under several detuning conditions, we characterized the phenomena as dispersive Q-switching, mode beating, and self-mode-locking.
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제안 방법
Therefore, it is necessary to control these parameters independently in each section. In this paper, we suggest a novel multisection DFB LD structure in which the two gratings are located one over and one under the active layers and are transferred by the conventional holographic method and regrowth procedure.
대상 데이터
This method has various merits: a flexible fabricating process, low cost, and the capability of mass production. The prepared laser consisted of three sections, two DFB sections and a phase tuning section integrated between the two DFB sections. In the longer (shorter) DFB section, the grating structure was located under (above) the active layers.
성능/효과
However, the coupling efficiency between sections was critical. Our simulation results (Time Domain Model) showed that stable pulsation was possible only when the coupling efficiency was larger than 80%. We cleaved the devices with different cavity lengths and measured the reflection.
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