A new miniaturized dual-mode microstrip bandpass filter is presented. The filter structure has been fractally generated based on the 4th iteration Minkowski-like pre-fractal geometry, using the conventional dual-mode square ring resonator as the initiator in the fractal generation process. It has been found that the presented filter possesses a size reduction of about 88% as compared with the d...

A quadband filter for 1.57 GHz GPS, 5.2 GHz WLAN and 3.5 GHz Worldwide Interoperability Microwave Access is designed and tested in this work. A compact Defected Ground Structure (DGS) quad-band microstrip Band Pass Filter, stub loaded Low Pass Filter, short circuited uniform impedance resonator and ring resonator are used to maintain the size and performance. Use of stub resonator at central po...

A stable dual-wavelength erbium-doped fiber (EDF) compound ring laser using a double-ring filter (DRF) is proposed and demonstrated experimentally. By using a ring filter incorporated within the ring cavity, the fiber laser can lase two wavelengths simultaneously. The dual-wavelength output exhibits a good performance having the optical side-mode suppression ratios (SMSRs) of 45.3 and 46.3 dB a...

A highly programmable optical filter architecture is designed and a unit cell building block is fabricated in InP-InGaAsP with tunable inter-ring couplers. Simulated and measured bandpass filter responses for the 3-ring structure are presented. ©2010 Optical Society of America OCIS codes: 230.5750 Resonators, 250.5300 Photonic integrated circuits

In this paper, Using a 2D photonic crystal and a novel square ring resonator,several compact and simple structures have been introduced in the present paper toconstruct optical add/drop filters and multi-channel filter. The difference structures hasbeen designed and simulated by using the proposed square ring resonator and differentdropping waveguides. To do analyses, th...

Abstract This paper proposes a tunable filter composed of semiconductor-insulator-semiconductor (SIS) waveguide with ring resonator at terahertz(THz) frequency. The two-dimensional study the proposed structure has been done using finite element method. It is observed that device can be used for filtering THz frequency within range 0.4 to 0.9 by varying structural parameters. simulated promising...