Fu-Li Wang, Xiu-Wen Ma, Yong-Zhen Huang, Yue-De Yang, Jun-Yuan Han, Jin-Long Xiao. Relative intensity noise in high-speed hybrid square-rectangular lasers[J]. Photonics Research, 2018, 6(3): 193
- Photonics Research
- Vol. 6, Issue 3, 193 (2018)
Fig. 1. Schematic and microscopic image of an HSRL with BCB confinement layer. Square and rectangular sections are electrically isolated by a 20 μm isolation trench.
Fig. 2. (a) Output powers coupled into a tapered single-mode fiber versus I FP I SQ I FP = 48 mA I SQ = 10 mA a = 15 μm d = 2 μm L = 300 μm
Fig. 3. Lasing spectra versus different injection currents of (a) I FP I SQ = 10 mA I SQ I FP = 45 mA I FP I SQ = 10 mA I SQ I FP = 45 mA a = 15 μm d = 2 μm L = 300 μm
Fig. 4. Normalized RF spectrum of the delayed self-heterodyne interference signal of lasing mode and Lorentzian fit to the measurement data, for the HSRL as I SQ = 10 mA I FP = 50 mA
Fig. 5. Small signal modulation responses of the HSRL with a = 15 μm d = 2 μm L = 300 μm I FP = 15 I SQ = 10 mA I SQ = 5 I FP = 45 mA f R 2 I FP I SQ = 10 mA
Fig. 6. Experimental setup for measuring the relative intensity noise characteristics for the HSRL. SMF, single-mode fiber; PD, photodetector; DMM, digital multimeter; ESA, electrical spectrum analyzer.
Fig. 7. Measured laser RIN with the variation of (a) I FP I SQ = 10 mA I SQ I FP = 45 mA a = 15 μm d = 2 μm L = 300 μm
Fig. 8. (a) Resonance frequency versus square root of the injection current above threshold and (b) damping factor versus f R 2 I FP I SQ = 10 mA
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