Widely Tunable Wavelength-Selective Reflector Using Polymer Waveguide Double-Ring-Resonator Add/Drop Filter and Loop-back Mirror

Abstract

A wavelength-selective reflector, composed of a double-ring-resonator add/drop filter and a loop-back mirror at the drop port to be used for a hybrid-integrated tunable laser is designed and fabricated. High-index-contrast polymer waveguide is used to realize a compact device as small as 2 mm x 0.4 mm. The radii of the rings are slightly different from each other to obtain a wide wavelength tuning via a vernier effect. Peak reflectivity is measured to be 52% for TE mode and polarization-dependent wavelength shift is 0.95 nm. The tuning range is measured to be about 42 nm for applied current as small as 46 mA.

Widely tunable optical source hybrid‐integrated with wavelength‐selective double‐ring‐resonator reflector

“…A transfer matrix calculation shows that the tuning range gets narrow with increasing perimeter difference, while the selectivity becomes high with increasing perimeter difference and decreasing coupling ratios [11, 12]. The radii of the circular waveguides in two ring‐resonators are decided to be 150 μm and 156 μm, and coupling ratios of ring‐bus and ring‐ring couplers 0.4 and 0.09, respectively, to make a trade‐off between good selectivity and wide tuning range of 40 nm.…”

Single Mode Lasing in InGaAsP/InP Semiconductor Coupled Square Ring Cavities

“…Semiconductor ring cavities offer a large number of applications due to the compact geometry, no need of cleaving and the possibility of integration between active and passive devices [1][2][3][4][5][6][7][8][9][10]. Recently, devices with ring cavities have been widely studied and utilized in several different technologies at all levels of cost in fabrication [11][12][13][14][15][16][17][18][19].…”

Polymeric Waveguides with Bragg Gratings in the Middle of the Core Layer

“…Such problems can easily be eliminated with Bragg grating waveguides [7]. The Bragg grating waveguides achieved compactness, high performance, and cost-effectiveness, as well as integration with an optical add/drop multiplexer [8][9], an external cavity laser [10][11], an optical triplexer transceiver [12], and a dispersion compensator [13] in a wavelength division multiplexing (WDM) optical communication system.…”