Abstract
We describe a hybrid laser structure which consists of an amplifying III-V waveguide proximity-coupled to a passive Si waveguide. By operating near the synchronism point (where the phase velocities of the individual waveguides are equal), we can cause the optical power to be confined to any of the two waveguides. This is accomplished by control of waveguides' geometry. In the portion of the supermode resonator where amplification takes place, the mode is confined nearly completely to III-V guide thus realizing a near maximal gain. Near the output facet, the mode power is confined to the Si waveguide thus optimizing the output coupling. This is to be contrasted with approaches which depend on evanescent field penetration into the III-V medium to obtain gain.
Highlights
The realization of optical lasers utilizing silicon as the lasing medium remains an elusive holy grail in optical communication research
In what follows we propose a new hybrid Si/III-V laser guiding structure which is based on the supermodes of a two waveguide systems
We propose a supermode hybrid Si/III-V laser design
Summary
The realization of optical lasers utilizing silicon as the lasing medium remains an elusive holy grail in optical communication research. In what follows we propose a new hybrid Si/III-V laser guiding structure which is based on the supermodes of a two (coupled) waveguide systems This approach eliminates, in principle, the basic compromise inherent in the evanescent laser design since the full modal power, rather than the evanescent tail, is available for amplification. Following the modal field through one round trip, the mode starts propagating from left to right in the upper left III-V waveguide where it is amplified. It enters the adiabatic transformer section where the width of the Si waveguide increases so as to cause δ to change from δ0. The same geometry can be used to make an absorption modulator or a current controlled phase or amplitude modulator
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