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In this paper we have investigated Broad Side Complementary Split Ring Resonator (BS-CSRR) loaded waveguide wide band band-pass filter. Three identical BS-CSRRs were inserted in the transverse plane of a standard waveguide at a distance of 9.023 mm. The proposed waveguide filter has been simulated using Ansoft HFSS (version 14). The proposed filter is compact and has wide bandwidth and acceptable...
In this paper a DP-QPSK modulation scheme has been used at 100 Gbps for the propagation length 500 km. To mitigate effects of Chromatic dispersion (CD) and Polarization mode dispersion (PMD), constant modulus algorithm (CMA) is used, while to compensate carrier phase estimation (CPE) a modified Viterbi-Viterbi algorithm is used by means of DSP at the receiver end. The comparison of constellation diagrams...
A single loop optoelectronic oscillator is synchronized in the optical domain by an external microwave signal. The system equation of such an oscillator has been derived. Normalized output voltage and frequency are calculated and the steady state output voltage as a function of time is studied. Theoretical results are presented in this short communication.
We numerically study the modulational instability (MI) gain at low input powers in a normal silicon-on-insulator (SOI) nanowaveguide. We find that, taking free carrier (FC)-effects in the MI gain analysis made the modulation unstable, due to an additional interaction of free carrier-induced dispersion and nonlinearity and hence made the normal SOI nanowaveguide suitable for nonlinear devices like...
Microwave photonic receiver for radar applications comprising a continuous wave laser together with amplitude modulators and narrow-band optical filters and converting radar signal to low (envelope) frequencies is considered. Possible characteristics of the receiver are estimated and different modes of its operation are discussed. It is shown that homodyne as well as heterodyne methods for transformation...
In the present paper, a compact L-band microstrip interdigital bandpass filter (BPF) with spurlines is designed. In the proposed microstrip interdigital BPF, spurious responses are suppressed and stopband attenuation is better than −14 dB everywhere upto 8 GHz excepting that near centre frequency of 4.87 GHz. The 3-dB bandwidth of the proposed BPF is 970 MHz (0.99 – 1.96 GHz) with a centre frequency...
A compact and wideband branch line coupler is designed that covers all the navigation bands starting form xx GHz to yy GHz. A single-section coupler with series stubs, half-wavelength at the mid-band frequency f0, is considered to obtain the wideband operation. Moreover, a hybrid approach, using both transmission line sections and lumped elements, is used for the size reduction without compromising...
This paper presents the simulation study of a castor leaf-shaped quasi-self-complementary antenna for broadband applications. The optimal design of proposed antenna provides −10 dB reflection coefficient bandwidth of 2–12 GHz. It is fed with 50 Ω coplanar waveguide (CPW) with in-built matching circuit. The antenna provides directive radiation pattern along with average gain value of 4.36 dB and more...
Wide range grade of pencils were used to draw on variety of sheet of papers. Raman spectroscopy and multimeter evaluate graphite structure and resistance of the area on the drawn paper before laser irradiation. The 10B grade of lead pencil draw on silver-halide print paper, and femtosecond laser was employed to irradiate the area of various papers drown by 10B lead pencil with varied scanning speed...
Recently developed technologies for 10G-class-PON and 40G-class-PON such as NG-PON2 in access networks are described, as well as a review of the current status. Key optical components for these systems are also presented. Further, the network evolution and technologies of metro-access networks for future mobile applications are discussed.
Fiber-optic techniques are very useful for Radar Applications. In this presentation a review of various opto-microwave techniques for radar applications will be given. Later we consider the analysis of Wavelength Division Multiplexed (WDM) networks for distribution of signals in a phased array Radar system. This also includes additional signal conditioning circuitry (electrical) for power equalization...
A technique for microwave frequency estimation with high accuracy based on Mach-Zehnder Modulator and Phase Modulator is proposed and demonstrated. In this proposed technique three dispersive fibers and two wavelengths are used to build power comparison factor. Wavelengths used are extracted from sidebands of MZM and then phase modulated with unknown frequency. Modulated signal is then passed through...
Electroplating on dielectric is used to realize continuous metallic side walls of a substrate integrated waveguide (SIW). Thus the complexity of fabricating chain of metallic via using precise mechanical or laser drilling used in conventional SIW fabrication is avoided. To show effectiveness of the procedure, a single cavity dual-mode bandpass filter is designed and fabricated. A modified corner cut...
The paper addresses both microwave and optical design of an electro-optic (E-O) polymer leaky waveguide deflector. The designed optical deflector should allow realizing an all-optical analog-to-digital converter (AOADC) operating over 44 giga-samples-per-second (GSPS) with a resolution of 6.5 bits and power consumption of only 4W. In order to make microwave access compatible with the waveguide topology,...
To get designing parameters of a frequency selective surface is very difficult and time consuming. This work suggests a method where different designing parameters with its respective resulting factors are kept in a data set from where accurate designing factors can be found for a desired frequency. Particle swarm optimization technique is suggested for proper searching. This algorithm can search...
In this work, we analyzed the effects of partial response coding (balance duobinary and dicode coding) in the presence of nonlinear effects. By simulation, we find that the balance duobinary coding is more affected by stimulus Raman scattering (SRS) by an amount of 0.5 dB as compare to dicode coding. So, dicode coding comparatively more tolerance to Raman cross talk in the video Overlay Passive Optical...
This paper proposes the design of a multiband absorber using EBG structures to absorb radiation in the X-band for stealth applications. It can also be used in the K and Ka bands for reduction of Electromagnetic Interference. The structure was created using Genetic Algorithm and the simulation was performed on Ansoft High Frequency Surface Solver (HFSS). The results indicate that the structure has...
A conductor-backed coplanar waveguide to microstrip via-hole less transition realized on a commercial BCB (Benzocyclobutene) polymer thin film is studied in this paper. By using thin substrates with a low-permittivity, the achieved experimental bandwidth covers the frequency band from 1 GHz to 69 GHz. This transition, using electromagnetic coupling between the bottom and top ground planes, is very...
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