The development of new Optical Coherence Tomography (OCT) techniques, such as swept-source OCT (SS-OCT), has increased the demand for ultra-fast, broadband and highly coherent swept sources. Among the existing technologies, Fourier Domain Mode-Locked Lasers rely on the periodic modulation of an intra-cavity filter in resonance with the cavity round-trip time [1] while the modulation of the cavity length of a single mode Vertical Cavity Surface Emitting Laser (VCSEL) can provide continuous tuning over 100’s of nm [2]. Multi-section semiconductor lasers, such as Sample-Grating Distributed Feedback (SG-DBR) Lasers have been used as widely tunable lasers in the telecom industry for many years and have, more recently, been considered for OCT applications [3]. One of the shortcomings of these lasers, when compared to VCSEL’s, is that they cannot have a continuous tuning of a single mode all across a wide spectrum required for OCT application as they exhibit many mode hops during a single sweep.

© 2019 IEEE

PDF Article


You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
Login to access OSA Member Subscription