Studi Awal Fabrikasi Dan Karakterisasi Directional Coupler Konfigurasi 4x4 Berbahan Serat Optik Plastik Step Index Multimode Tipe FD-620-10 Menggunakan Metode Heating and Pressing

Fabrikasi directional coupler singlemode maupun multimode berbentuk pandu gelombang slab masih sangat sulit dilakukan dan membutuhkan peralatan yang rumit. Untuk mengatasi kendala tersebut telah dilakukan fabrikasi directional coupler dengan metode Fused Biconical Tapered (FBT), yaitu dengan menggabungkan sejumlah serat optik pada panjang kopling tertentu sehingga menjadi directional coupler dengan N-port (Sekartedjo dkk, 2007). Metode yang digunakanpun cukup sederhana yaitu dengan membagi daya (power divider) pada directional coupler. Akan tetapi, pada metode Fused Biconical Tapered (FBT) masih ditemui beberapa kendala yaitu, adanya daya yang bocor melalui celah-celah benang pada saat penggandengan serat optik, sehingga daya yang dihasilkan tidak terbagi secara merata. Oleh karena itu, dalam penelitian ini directional coupler difabrikasi menggunakan bahan serat optik plastik (POF) step index multimode tipe FD-620-10 dengan metode Heating and Pressing. Dari penelitian yang telah dilakukan didapatkan fabrikasi directional coupler konfigurasi 4x4 dari serat optik mode jamak dengan pendekatan metode heating and pressing dengan panjang kupasan 35 mm pada suhu 1200c dengan lama pemanasan cetakan pressing selama 30 menit. Hasil karakterisasi directional coupler, diperoleh nilai coupling ratio (CR) yang mendekati 0,25 yaitu berkisar antara 0,22-0,27. Sedangkan nilai excess loss pada port A1, B1, C1, dan D1 berturut-turut sebesar -4, -5.03, -5.91, dan -5.38

The nonlinear directional coupler. An analytic solution

Linear and nonlinear directional couplers are currently used in fiber optics communications. They may also play a role in multiphoton approaches to quantum information processing if accurate control is obtained over the phases and polarizations of the signals at the output of the coupler. With this motivation, the constants of motion of the coupler equation are used to obtain an explicit analytical solution for the nonlinear coupler.Comment: 6 pages Late

Integrated optical directional coupler biosensor

We present measurements on biomolecular binding reactions, using a new type of integrated optical biosensor based on a planar directional coupler structure. The device is fabricated by Ag+-Na+ ion-exchange in glass and definition of the sensing region is achieved by use of transparent fluoropolymer isolation layers formed by thermal evaporation. The suitability of the sensor for application to the detection of environmental pollutants is considered

Ultra-Broadband Directional Couplers Using Microstrip with Dielectric Overlay in Millimeter-Wave Band

Nowadays, millimeter-wave systems are being a key factor to develop wide band applications. In this paper, a directional coupler in millimeter-wave band using dielectric overlay is presented. This leads us to technology aspects, in directional coupler design, are key points to achieve the proper response of the circuit. The coupler proposed in this paper covers the 15-45 GHz band and its response has 15-dB coupling-level, 1-dB coupling-ripple and a reflection coefficient better than 10 dB

3D Directional Coupler for Impulse UWB: 3D Electromagnetic Simulation and Prototyping

The AWS Group developed a UWB radar and UWB transceiver for indoor people location and tracking. A radar concept has been developed. This paper will describe step by step the realization of a UWB directional coupler with a novel 3-D architecture. This paper gives a walkthrough of our design of the 3-D directional coupler

Nonlinear switching of low-index defect modes in photonic lattices

We address nonlinear signal switching between two low-index defect channels induced in periodic optical lattices. In contrast to conventional directional couplers, where the guiding mechanism is total internal reflection or refraction, in such Bragg-type coupler, the guidance is of a photonic-bandgap origin. The coupling length in the low-index coupler is controlled by the lattice parameters and by the channel spacing. In the nonlinear regime the Bragg-type coupler behaves as an all-optical switch, exhibiting a remarkable difference of switching power for focusing versus defocusing nonlinearity.Comment: 13 pages, 4 figures, to appear in Physical Review

Coupling tunable D-band directional coupler for millimeter-wave applications

A coupling tunable D-band directional coupler is designed based on a novel coupling grid structure proposed in this letter. The designed directional coupler has excellent performance with ultra-wideband. The coupling can be tuned from -28.2 dB to -33.2 dB at 140 GHz by changing the angle of the coupling grid, and the dynamic range of the coupling is about 5 dB. The return loss is smaller than -15 dB in the whole D-band from 110 GHz to 170 GHz. A 3-dB coupler use the similar coupling structure is also designed. The coupling is 3.3144 dB at the center frequency of 140 GHz.Comment: 2 pages, 6figure