  Enhancing the modulation bandwidth (MBW) of semiconductor lasers has been the
challenge of research and technology to meet the need of high-speed photonic
applications. In this paper, we propose the design of vertical-cavity
surface-emitting laser integrated with multiple transverse coupled cavities
(MTCCs) as a promising device with ultra-high 3-dB bandwidth. The laser
features high modulation performance because of the accumulated strong coupling
of the slow-light feedback from the surrounding lateral TCCs into the VCSEL
cavity. Photon-photon resonance (PPR) is predicted to occur at ultra-high
frequencies exceeding 145 GHz due to the optical feedback from short TCCs,
which achieves 3-dB MBW reaching 170 GHz. The study is based on the modeling of
the VCSEL dynamics under multiple transverse slow-light feedback from the
surrounding TCCs. We show that the integration of the VCSEL with four or six
feedback cavities is advantageous over the TCC-VCSEL in achieving much higher
MBW enhancement under weaker coupling of slow-light into the VCSEL cavity. We
also characterize the noise properties of the promising MTCC-VCSEL in the
regime of ultra-high bandwidth in terms of the Fourier spectrum of the relative
intensity noise (RIN).
