PVN-CAT-031-C-006-001-CNMDL

The objective of this project is to study techniques for controlling the duration of ultrashort (femtosecond) optical pulses by using the properties of dispersive and nonlinear media.RP 60/9

Prism coupling measurement of benzocyclobutene (BCB 4024-40) polymer for optical devices application

Prism coupling method is employed in the characterization process of BenzoCyclobutene (BCB 4024-40) polymer slab structure. This method is used to characterize the polymer refractive index, variation of film thickness with spin coating speed and average value of polymer loss. The information obtained is appreciably useful, particularly in the actual design of optical waveguides and devices based on BCB 4024-40 polymer material

Design of optical building blocks for photonic integration

We present a transfer matrix analysis of a 2-D filter to study its frequency response functions. The (M xN) array consists of N independent columns of micro-ring resonators side-coupled to two channel bus waveguides, with equal spacing between columns and each column consisting of M coupled resonators. We show that the bandgap of the 2-D structure is a superposition of the non-overlapping bandgap of the two 1-D arrays. This non-overlapping property can be used to realize the "near-ideal" filter with flat and sharp passband, negligible sidelobes in the stop bands, and linear phase response over 80% of the passband. The existence of defect mode in linear and lossless ring resonator arrays is also demonstrated. The defect can be introduced by removing one ring or by making one ring bigger or smaller. Defect states within the photonic bandgaps behave like either donor or acceptor modes similar to other photonic crystals. The results based on transfer matrix model shows reasonable agreement with finite difference time domain (FDTD) simulations

Prism coupling measurement of Benzocyclobutene (BCB 4024-40)polymer for optical devices application

Prism coupling method is employed in the characterization process of BenzoCyclobutene (BCB 4024-40) polymer slab structure. This method is used to characterize the polymer refractive index, variation of film thickness with spin coating speed and average value of polymer loss. The information obtained is appreciably useful, particularly in the actual design of optical waveguides and devices based on BCB 4024-40 polymer material

Design of Multimode Interference Optical Splitter Based on BenzoCyclobutene (BCB 4024-40) Polymer

1x2 and 1x3 planar optical splitter based on BenzoCyclobutene (BCB 4024-40) polymeric material are proposed. The design is based on symmetric interference mechanism and simulated using the combined technique of effective index method and commercial BPM-CAD software from Optiwave. A ridge waveguide of BCB 4024-40 on BK7 glass substrate is employed as the simulated structure. The simulation at 1550 nm optical wavelength shows an insertion loss of 2.75 dB and 4.73 dB for 1x2 and 1x3 splitter respectively. The uniformity is shown to be less than 0.5 dB. This provides useful idea on the applicability of BCB 4024-40 to be realized as an optical splitter

Optical waveguides in benzocyclobutene (BCB 4024–40) polymer

The fabrication and characterization processes of single mode optical waveguide based on photosensitive BenzoCyclobutene (BCB 4024–40) polymer are described. The polymer film thickness for various coating speed and refractive index are measured by the method of prism coupling. The waveguide is fabricated using the photolithography and chemical etching technique on BK7 glass substrate with a thin layer of SiO2 as cover. The waveguide loss is measured using the conventional cut back method which results on an average loss of 3.5 dB/cm

Box-like filter response of two-dimensional array of microring resonator fabricated in silicon-on-insulator technology

We show theoretically and demonstrate experimentally that box-like response can be obtained using 2D arrays of microring resonator. The box-like response is manifested from the complementary photonic bandgap properties of the column and row configurations. The observed sidelobe suppression is similar to 10dB, while the usable bandwidth can be as high as 500 to 750 GHz

Defect modes in microring resonator arrays fabricated in silicon-on-insulator technology

We show experimentatly the existence of defect modes in mutually coupled microring resonator array fabricated in silicon-on-insulator technology. The movements of donor-like and acceptor-like modes are demonstrated for various defect lengths and in a good agreement with earlier theoretical prediction

Polymeric Optical Splitter Based on Multimode Interference Mechanism

A 1x2 and 1x3 planar optical splitter based on BenzoCyclobutene (BCB 4024-40) polymeric material is proposed. The device is designed based on symmetric interference mechanism, utilizing a BK7 glass as a substrate and thin layer of SiO2 as a cover. Simulation results show that the splitting uniformity is better than 0.5 dB at 1550 nm optical wavelength