Two novel compact BLCs were developed and proposed with compact size and improve the performance of dual-band branch-line couplers (BLCs). The developed model was reported to be a two-section stepped-impedance resonator which includes a highimpedance section accompanied by loaded double branches lines. The proposed model was shown to reduce the size of the dual-band BLC around 61% as well as a ...

We introduce a fiber ring optical resonator based on adiabatic fused-fiber grating couplers. The coupling of a through fiber to the resonator is controlled by the strength of the fiber Bragg gratings. By using two of these couplers and incorporating erbium-doped (ED) fiber in the ring, we control the internal loss of the ring by pumping the ED fiber. The transmission spectra of the through port...

In this paper, all-optical logical gates based on mismatched nonlinear two-core fiber couplers are proposed. In these devices, solitonlike logical input pulses are shown to avoid pulse breakup to perform logical operations. The mismatched two-core fiber couplers can be produced through slightly different cores embedded in the same cladding. In this situation, the two cores have different disper...

Couplers that link together two or more numerical simulations are well-known abstractions in the Earth System Modeling (ESM) community. In the past decade, reusable software assets have emerged to facilitate scientists in implementing couplers. While there is a large amount of overlap in the features supported by software coupling technologies, their implementations differ significantly in term...

The 50MeV, 100mA energy-recovery-linac (ERL) demonstration facility bERLinPro is currently undergoing construction at HZB. The high power injection system, that will deliver a beam at 6MeV, is split into a 1.4 cell SRF photo injector and three Cornell-style 2-cell boosters. The injector and two of the booster cavities will provide about 2MeV each and must handle up to 220 kW of beam loading. Ne...

This study presents design and optimization of compact efficient nanooptical couplers involving photonic crystals. Nanooptical that have single double input ports are designed to obtain transmission electromagnetic waves in desired directions. In addition, these cascaded by adding one after another realize systems. the all couplers, multilevel fast multipole algorithm, which is an full-wave sol...

Theoretical analysis and Computer simulations have proven to be cost-effective and powerful tools in scientific studies of materials, particularly at nano-scale where synthesis of nano-structures, interpretation of their observed character and exploration of new structures are not always straight forward. We present here fundamental principles of techniques used today for computational simulati...

The self-imaging property of a homogeneous multi-moded planar optical waveguide has been applied in the design optical couplers based on multimode Interference (MMI). Based on this design, the optical wavelength and dimensions tolerance for MMI-3dB couplers are investigated analytically. They are shown to be inversely proportional to the multimode section width. Among Symmetrical, paired, and g...

We demonstrate fully-etched fiber-waveguide grating couplers with sub-wavelength gratings showing high coupling efficiency as well as low back reflections for both transverse electric (TE) and transverse magnetic (TM) modes. The power reflection coefficients for the TE and TM modes have been significantly suppressed to -16.2 dB and -20.8 dB, respectively. Focusing grating lines have also been u...

We report on the design and fabrication of compact and potentially low-cost multimode fiber matched 1 x N and N x N couplers for LAN’s. The design utilizes the self-imaging effect and tapering of the Multi-Mode Interference (MMI) section. An extended mode propagation analysis and 3-D beam propagation method (BPM) were used to analyze and design these structures. The simulations show that the co...