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Design of parabolic-shaped collimating lens.
Proposed tunable ECL monolithically integrated with parabolic-shaped collimating lens. (a) schematic diagram of tunable ECL, (b) magnified view of diffraction grating, and (c) mode coupling between the shallowly and the deeply etched waveguide.
Excess loss of parabolic-shaped collimating lens as a function of slab length.
cw curve of proposed tunable ECL monolithically integrated with parabolic-shaped collimating lens.
Superimposed output spectra. . The applied current of optical deflector corresponding to each spectrum is as follows: (1) , (2), (3) , (4) , (5) , (6) , (7) , (8) , (9) , (10) , (11) , (12) , and (13) . The current of phase control section was adjusted to achieve high SMSR.
Quasi-continuous wavelength tuning and SMSR vs current of phase control section. (, )
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