Abstract
We numerically analyze a delay differential equation model of a short-cavity semiconductor laser with an intracavity frequency-swept filter and reveal a complex bifurcation structure responsible for the asymmetry of the output characteristics of this laser. We show that depending on the direction of the frequency sweep of a narrow-band filter, there exist two bursting cycles determined by different parts of a continuous-wave solutions branch.
Highlights
Optical Coherence Tomography (OCT) has enabled the fast and reliable visualization of various tissues for medical assessment [1]
Swept-Source OCT is a technology that relies on coherent lasers that can scan hundreds of nanometers in a few microseconds to enable real time videos and, as a result, has found a wide range of medical applications in areas such as ophthalmology or cardiology [2]
Vertical Cavity Surface Emitting Lasers (VCSELs) have a cavity length of a single optical wavelength and their tunability is achieved by a slight modification of the cavity length
Summary
Optical Coherence Tomography (OCT) has enabled the fast and reliable visualization of various tissues for medical assessment [1]. Swept-Source OCT is a technology that relies on coherent lasers that can scan hundreds of nanometers in a few microseconds to enable real time videos and, as a result, has found a wide range of medical applications in areas such as ophthalmology or cardiology [2]. To obtain such performance, researchers have developed novel frequency swept light sources, such as Fourier Domain Mode-Locked Lasers (FDML) [3], short external cavity lasers [4–7], Vertical Cavity Surface Emitting Lasers (VCSELs) with micro-electromechanical system (MEMS) driven filters [8–11], multi-section semiconductor lasers [12], and photonic integrated circuit devices [13]. We present a detailed bifurcation analysis of the model equations, discuss coexisting dynamical regimes such as longitudinal mode hopping, quasiperiodic pulsations and chaos, and compare the results with those obtained earlier [16] for a long cavity laser
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