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A low-loss CROW delay line with a weak inter-resonator coupling determined by the Kac matrix is dispersionless and can be easily impedance-matched by adjusting the coupling to the input/output waveguide.
Resonant narrowband out-coupler designs for laser systems leave a portion of the device exposed to damage and contamination. We present a fabrication method for full device encapsulation, resulting in a highly reflective, protected spectral filter.
High-Q performance in microcavities relies upon use of low absorption dielectrics and creation of smooth dielectric interfaces. For chip-compatible devices, silica has the lowest intrinsic material loss [1]. Microtoroid resonators combine this low material loss with a reflow technique in which surface tension is used to smooth lithographic and etch-related blemishes [2]. At the same time, reflow smoothing...
A chromatic dispersion tailored composite Si3N4-SiO2 waveguide microring resonator allows generating significantly broader Kerr optical frequency combs, as compared with an identical conventional Si3N4 microring resonator, under the same optical pumping conditions.
We investigate a nonlinear coupling effect which results from frequency comb-induced pump saturation in a silicon nitride microring cavity fabricated with both through-and drop-ports.
Noise properties of 40 GHz passively mode-locked quantum-dot lasers under optical self-feedback are investigated theoretically and experimentally, showing five different regimes. We identify a regime of resonant feedback yielding a record RF-line-width reduction by 99%.
Intensity stability with respect to pumping level and temperature is examined in electrically injected dual-λ lasers with separations between 8 and 63 nm that utilise different quantum dot states or quantum dot and quantum well states.
We demonstrate the effect of p-doping on threshold current density at low temperatures which shows distinctive behavior explained by spontaneous emission spectra taken at thresholds. Their full width half maximum accompanied with carrier distribution is higher in p-doped structure compare to undoped one.
The nanosecond lasing performance of core-shell and alloyed CdSe/ZnS colloidal quantum dots is reported. Low amplified spontaneous emission and laser oscillation thresholds of 0.55mJ/cm2 and 0.9mJ/cm2 are demonstrated for, respectively, thin-films and distributed-feedback cavity structures.
1310 nm-band wafer-fused VCSELs emitting in the coarse wavelength division multiplexing wavelength grid operate at 10 Gbps in the temperature range up to 70 °C at 7 mA bias current and operation voltage below 1.9 V. These devices can yield 4×10 Gbps 2 km links with power consumption of ∼1 W.
We demonstrate the transverse-mode control of 980nm VCSELs using highly angular dependent HCG mirrors. The fabricated a-Si HCG clearly shows the large angular dependence of reflectivity, which enables single transverse-mode operations of large-area VCSELs.
Polarization resolved optical spectral analysis of multimode, oxide-confined asymmetric VCSELs is presented. High-extinction-ratio polarization switching has been observed even in the multimode regime of these VCSELs. Furthermore, high-frequency polarization modulation of over a GHz with gated RF electrical modulation has been achieved.
Vertical cavity surface emitting lasers (VCSELs) are an important light source for applications in communication and appliances consumer use. However, the types of III-V semiconductor materials that can be used to manufacture monolithic VCSELs are limited to only few choices. Moreover, limitations of the device materials will also limit the functionality of VCSELs incorporated into microsystems. Various...
Beam steering with optical phased arrays is accomplished by introducing a relative phase shift between array elements [1]. This is typically achieved by altering the refractive index difference between elements, which alters the optical path length of incident radiation traveling through the elements. Beam steering with VCSEL arrays has also been shown to rely on such a refractive index variation...
We have developed an electrically driven photonic-crystal nanocavity laser with an ultra-low threshold current and a high temperature characteristic. Lasing is achieved under continuous-wave operation at high temperatures of up to 95°C.
We present the lowest energy per bit operation of a hybrid integrated light source on a silicon chip for optical interconnection considering wall-plug efficiency of a laser diode (LD). We investigated a multi-channel configuration for low power operation of light sources on a silicon substrate in a photonics-electronics convergence system. We confirmed that lower power consumption per channel can...
Modal gain characterization of mid-infrared semiconductor optical amplifiers intended for an active-passive integration platform is presented. Measured gain profiles reveal the peak values at around 2.07µm and 3dB bandwidth up to 27nm.
We present a class of fibers that exploit light propagation in higher-order modes, and hence decouple the dispersion-versus-mode-area trade-off encountered in conventional fibers. This enables exploiting the multitude of nonlinear optical effects afforded by fibers, at energy levels potentially approaching those of tunable solid-state lasers.
The doping or substitution of the typical matrix material silica in microstructured fibers (MOFs) enables the improvement of their optical performance and functionality. Cross sectional views of three MOFs discussed in this paper are exemplarily shown in Figure 1.
Molybdenum disulfide nano-sheets were all-optically deposited on a single mode fiber facet, and its process was monitored by a reflectometry method. Nonlinear response and power dependent transmission of prepared sample was observed by a 1552nm fiber laser.
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