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(a) Top view image of the APSRL (Type B). (b) Layer structure of the cross section of APSRL across the active medium.
P-I characteristic of the APSRL device (B type). The insets show the optical spectra at pumping current 135 and 180 mA. The measured mode-spacing in left inset is 0.035 nm, which exactly corresponds to the spacing of the longitudinal cavity modes. We carried out the continuous wave operation at .
(a) rf spectrum data of self-beating of the laser output from the self-heterodyne interferometer measurement in case of A type (short blue dash line), B type (red long-dash line), and C type (black line). (b) The measured linewidth (closed circle) and theoretical expectation values (solid line) of APSRLs vs the length of the passive cavity waveguide.
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