研究目的
To compare the self-injection-locking effects of a DFB-LD realized by two fiber ring resonators and an optical waveguide ring resonator, focusing on linewidth narrowing, mode hopping suppression, and phase noise.
研究成果
The study demonstrates that both the bandwidth and transmission of the resonance peak of the ring resonator affect the linewidth narrowing of the laser, with bandwidth playing a greater role. The optical waveguide ring resonator significantly suppresses mode hopping and is beneficial for phase noise reduction, offering advantages for practical applications and integration of self-injection-locked DFB-LDs.
研究不足
The study is limited by the sensitivity of optical fiber ring resonators to external environmental conditions like temperature and vibration, leading to frequent mode hopping. The optical waveguide ring resonator, while more stable, has a larger bandwidth which results in a less narrowed linewidth compared to fiber resonators.
1：Experimental Design and Method Selection:
The study compares the self-injection locking of a DFB-LD using two fiber ring resonators and an optical waveguide ring resonator. The methodology involves measuring the transmission spectra of the resonators and the linewidth narrowing, mode hopping, and phase noise of the locked laser.
2：Sample Selection and Data Sources:
The DFB-LD used is SC-Lightsource DFB-1550 with a linewidth of 1 MHz. The resonators include two optical fiber ring resonators and a silica optical waveguide ring resonator.
3：List of Experimental Equipment and Materials:
Equipment includes a tunable narrow linewidth fiber laser (Koheras E15), PIN photodetector, oscilloscope, optical circulator, couplers, isolator, acousto-optic frequency shifter (AOFS), and spectrum analyzer (Agilent E4403B).
4：Experimental Procedures and Operational Workflow:
The setup involves locking the DFB-LD through each resonator, measuring the transmission spectra, linewidth narrowing using delayed self-heterodyne detection, monitoring mode hopping, and measuring phase noise.
5：Data Analysis Methods:
The linewidth is measured using delayed self-heterodyne method, mode hopping is monitored via output optical powers at specific ports, and phase noise is measured using heterodyne method and signal source analyzer.
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