We report a dual-wavelength passive mode locking regime where picosecond pulses are generated from both ground (lambda = 1263 nm) and excited state transitions (lambda = 1180 nm), in a GaAs-based monolithic two-section quantum-dot laser. Moreover, these results are reproduced by numerical simulations which provide a better insight on the dual-wavelength mode-locked operation.

To accommodate fast growing mobile traffic, many network operators make efforts to increase the number of small cells especially in urban hot spot areas. 3rd Generation Partnership Project (3GPP), a global standard organization for wireless telecommunication, introduced dual connectivity, i.e., inter-eNB (evolved Node B) carrier aggregation for small cell deployment. With dual connectivity, a u...

Background: The Singh index is an inexpensive simple method to evaluate bone density, commonly used to assess osteoporosis is based on the radiological appearance of the trabecular bone structure of the proximal femur on a plain antero-posterior (AP) radiograph. The purpose of this study was to compare between Singh index and bone mineral density measurement using dual energy X-ray abs...

Dual-comb sources with equally spaced and low phase noise frequency lines are of great importance for high resolution spectroscopy metrology. In the terahertz range, electrically pumped semiconductor quantum cascade lasers (QCLs) suitable candidates comb dual-comb operation. For a single laser comb, repetition rate can be locked using microwave injection locking carrier to highly stable source....

background: blood is permanently exposed to oxidation stress and therefore has a high antioxidants capacity. many different factors increasing the demand for the antioxidant capacity can be observed in the stored blood of donors. consequently, damage to erythrocytes by free radicals may occur. so it is useful to control the alternation of anti-oxidant enzymes in stored blood at different days o...

Dual-wavelength dissipation soliton (DS) in the all-normal-dispersion ytterbium-doped fiber laser (YDFL) is reported. Using a phase-shift long period fiber grating (PS-LPFG) as an all-fiber format spectral filter in the laser cavity, self-starting dual-wavelength pulses are obtained by nonlinear polarization evolution (NPE). The mode-locking mechanism of the ANDi cavity with different central w...