We both experimentally and numerically studied the ultra-compact wavelength conversion by using the four-wave mixing (FWM) process in Raman distributed-feedback (R-DFB) fiber lasers. The R-DFB fiber laser is formed in a 30 cm-long commercially available Ge/Si standard optical fiber. The internal generated R-DFB signal acts as the pump wave for the FWM process and is in the normal dispersion ran...

AbstructWe demonstrated the successful operation of longwavelength InGaAsP low threshold-current index-coupled and gain-coupled DFB lasers grown by chemical beam epitaxy (CBE). For index-coupled DFB lasers, buried-heterostructure six-QW DFB lasers (250 pm long and as-cleaved) operated at 1.55 Lrm with CW threshold currents 10-15 mA and slope efficiencies up to 0.35 mW/mA (both facets). A side-m...

In this paper, we present a SRAM-PCM hybrid cache design, along with a cache replacement policy, named dead fast block (DFB) to manage the hybrid cache. This design aims to leverage the best features of both SRAM and PCM devices. Compared to a PCM-only cache, the hybrid cache with DFB policy provides superior results on all relevant evaluation metrics, viz. cache lifetime, performance and energ...

This Letter reports on an optical pumping scheme, termed resonant pumping, for an erbium-doped distributed feedback (DFB) waveguide laser. The scheme uses two mirrors on either side of the DFB laser, forming a pump cavity that recirculates the unabsorbed pump light. Symmetric distributed Bragg reflectors are used as the mirrors and are designed by matching the external and internal quality fact...

Self-mixing interference (SMI) in terahertz quantum cascade lasers (THz QCLs) is one of the significant approaches for coherent THz imaging and sensing techniques. Here, output characteristics SMI distributed feedback (DFB) QCLs from index-to gain-coupling regimes are studied using coupled wave theory multi-mode rate equation method. A mode hopping phenomenon found to occur when DFB coupling fa...

Differential chemosensors have emerged as next-generation systems due to their simplicity and favourable responsive properties produce different signals upon selective binding of various analytes simultaneously. Nevertheless, given inadequate fluorescence response laborious synthetic procedures, only a few differential been developed so far. In this work, we employed single pot synthesis strate...

We report the demonstration of low order distributed feedback DFB optofluidic dye lasers with reduced threshold. The laser chips were realized in polydimethylsiloxane using replica molding with two masters. A comparison between first, second, and third order DFB dye lasers was performed, while the second order DFB dye laser exhibited the lowest pump threshold of 78 nJ/pulse. Compared to previou...

The wavelength tuning is an important issue for distributed feedback (DFB) lasers designs and applications. In this paper we have presented an algorithm to analyze the wavelength tuning characteristics of twosection index-coupled (TS-IC) DFB lasers in above threshold regime, by the means of the transfer matrix method (TMM), and the carrier rate equation. The versatility of the theoretical model...

Finding edges in digital images is an essential and important task in many imaging applications. This paper describes an edge detection using multi scale Directional Filter Bank (DFB). This method tries to solve two difficulties that edge finding algorithms must face: limited directions and combining the detected edges at different scales. The directional responses of DFB that represent the edg...

in this paper, based on the coupled-mode and carrier rate equations, a dynamic model and numerical analysis of a multi quantum well (mqw) chirped distributed feedback semiconductor optical amplifier (dfb-soa)  all-optical flip-flop is precisely derived. we have analyzed the effects of strains of qw and mqw and cross phase modulation (xpm) on the dynamic response, and rise and fall times of the ...