We demonstrate a high-performance optical arbitrary waveform shaper based on a single 10 GHz arrayed-waveguide grating with 64 loopback waveguides and integrated amplitude and phase modulators on each waveguide. The design is compact and self-aligning and allows for bidirectional operation. The device's complex transfer function is manipulated and measured over the full 640 GHz passband. To dem...

We show that the properties of the confined modes of a photonic band-gap ~PBG! waveguide can be calculated with good accuracy by replacing it with an effective corrugated waveguide that represents only the structure in the vicinity of the middle slab. Such a replacement is helpful in the design of the PBG waveguides as well as in the understanding and analysis of the coupling of different waveg...

A highly sensitive refractive index sensor based on grating-assisted strip waveguide directional coupler is proposed. The sensor is designed using two coupled asymmetric strip waveguides with a top-loaded grating structure in one of the waveguides. Maximum light couples from one waveguide to the other at the resonance wavelength, and the change in resonance wavelength with the change in refract...

We numerically and experimentally demonstrated highly directional emission from photonic crystals (PCs). Our structures comprise branched waveguide channels with a periodic doubling scheme. An incident electromagnetic wave can be first split into multiple beams using PC waveguide structures. The beams were then emitted at the output waveguide ports of the PC with the same phase, which resulted ...

The relationship between the design parameters and small molecule detection sensitivity of porous silicon waveguides is theoretically and experimentally analyzed. Perturbation theory calculations suggest that the sensitivity asymptotically approaches infinity as the porosity of the waveguide approaches a critical porosity for a given mode and the resonant coupling angle of light into the wavegu...

Monolithic integration of photonic crystal lasers and waveguides is proposed using quantum well intermixing. Coupling between a double-heterostructure nanocavity and a regular single-line-defect waveguide is optimized to have a high coupling efficiency (93%) and a high quality factor (6.8× 103) without fine-tuning of the lattice. The design is completed with a waveguide exit of robust direction...

The design of grating-assisted, channel waveguide, codirectional couplers is demonstrated using the Gel’fand-Levitan-Marchenko inverse scattering method. Weighted coupling coefficients are computed from rational function expressions for the desired wavelength response. Approximate formulas are derived which relate the waveguide and grating geometries to the computed coupling coefficients. The t...

In this letter, we find that gradient index metamaterials (GIMs) could be utilized to manipulate wave propagation in waveguides. Through manipulating the conversion between propagating wave and surface wave, we can design some interesting applications in waveguides, such as controlling transmission effect, realizing bending waveguide and achieving waveguide splitting effect. These devices not o...

Heterogeneously integrated III-V-on-silicon second-order distributed feedback lasers utilizing an ultra-thin DVS-BCB die-to-wafer bonding process are reported. A novel DFB laser design exploiting high confinement in the active waveguide is demonstrated. A 14 mW single-facet output power coupled to a silicon waveguide, 50 dB side-mode suppression ratio and continuous wave operation up to 60°C ar...

This paper addresses the use of an inharmonic digital waveguide (IDWG) filter as an efficient means to synthesize hand-bell sounds. The IDWG is obtained by inserting a second-order allpass filter to the feedback path of a waveguide string model. An automated iterative procedure for estimation of the allpass filter coefficients and the length of the delay line is proposed. Limitations of the dev...