Passband flattening in waveguide grating devices using phase-dithering

2002 ◽  
Author(s):  
Jian-Jun He ◽  
Emil S. Koteles ◽  
Bedwyr Humphreys
Keyword(s):  
Waveguide Grating

8-wavelength photonic integrated 2 × 2 WDM cross-connect switch using 2 × N phased-array waveguide grating (PAWG) multi/demultiplexers

1997 ◽  
Vol 33 (7) ◽  
pp. 592 ◽  
Author(s):  
Haifeng Li ◽  
Chau-Han Lee ◽  
Wenhua Lin ◽  
S. Didde ◽  
Ying-Jui Chen ◽  
...  
Keyword(s):  
Phased Array ◽  
Waveguide Grating ◽  
Cross Connect ◽  
Array Waveguide Grating

scholarly journals Analysis of Dielectric Waveguide Grating and Fabry–Perot Modes in Elastic Grating in Optical Detection of Ultrasound

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4081
Author(s):  
Suejit Pechprasarn ◽  
Chayanisa Sukkasem ◽  
Phitsini Suvarnaphaet
Keyword(s):  
Optical Properties ◽  
Dielectric Waveguide ◽  
Figure Of Merit ◽  
Pressure Range ◽  
Optical Filter ◽  
Grating Period ◽  
Wave Mode ◽  
Waveguide Grating ◽  
Fabry Perot ◽  
Optical Grating

In our previous work, we have demonstrated that dielectric elastic grating can support Fabry–Perot modes and provide embedded optical interferometry to measure ultrasonic pressure. The Fabry–Perot modes inside the grating provide an enhancement in sensitivity and figure of merit compared to thin film-based Fabry–Perot structures. Here, in this paper, we propose a theoretical framework to explain that the elastic grating also supports dielectric waveguide grating mode, in which optical grating parameters control the excitation of the two modes. The optical properties of the two modes, including coupling conditions and loss mechanisms, are discussed. The proposed grating has the grating period in micron scale, which is shorter than the wavelength of the incident ultrasound leading to an ultrasonic scattering. The gap regions in the grating allow the elastic grating thickness to be compressed by the incident ultrasound and coupled to a surface acoustic wave mode. The thickness compression can be measured using an embedded interferometer through one of the optical guided modes. The dielectric waveguide grating is a narrow bandpass optical filter enabling an ultrasensitive mode to sense changes in optical displacement. This enhancement in mechanical and optical properties gives rise to a broader detectable pressure range and figure of merit in ultrasonic detection; the detectable pressure range and figure of merit can be enhanced by 2.7 times and 23 times, respectively, compared to conventional Fabry–Perot structures.

scholarly journals Optimal Design of an Ultrasmall SOI-Based 1 × 8 Flat-Top AWG by Using an MMI

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Hongqiang Li ◽  
Yaoting Bai ◽  
Xiaye Dong ◽  
Enbang Li ◽  
Yang Li ◽  
...  
Keyword(s):  
Insertion Loss ◽  
Spectral Response ◽  
Beam Propagation Method ◽  
Silicon On Insulator ◽  
Optimized Design ◽  
Arrayed Waveguide Grating ◽  
Channel Spacing ◽  
Waveguide Grating ◽  
Passband Width ◽  
Arrayed Waveguide

Four methods based on a multimode interference (MMI) structure are optimally designed to flatten the spectral response of silicon-on-insulator- (SOI-) based arrayed-waveguide grating (AWG) applied in a demodulation integration microsystem. In the design for each method, SOI is selected as the material, the beam propagation method is used, and the performances (including the 3 dB passband width, the crosstalk, and the insertion loss) of the flat-top AWG are studied. Moreover, the output spectrum responses of AWGs with or without a flattened structure are compared. The results show that low insertion loss, crosstalk, and a flat and efficient spectral response are simultaneously achieved for each kind of structure. By comparing the four designs, the design that combines a tapered MMI with tapered input/output waveguides, which has not been previously reported, was shown to yield better results than others. The optimized design reduced crosstalk to approximately −21.9 dB and had an insertion loss of −4.36 dB and a 3 dB passband width, that is, approximately 65% of the channel spacing.

Guided-mode resonance excitation of waveguide grating at oblique incidence in the non-subwavelength region

2012 ◽  
Vol 59 (10) ◽  
pp. 893-902
Author(s):  
Tian Sang ◽  
Shaohong Cai ◽  
Xun Zhou ◽  
Zhanshan Wang
Keyword(s):  
Oblique Incidence ◽  
Resonance Excitation ◽  
Waveguide Grating ◽  
Guided Mode ◽  
Guided Mode Resonance

A Wavelength Interleaved DWDM ROF System with 60GHz Optical OFDM Signal

2011 ◽  
Vol 130-134 ◽  
pp. 2245-2248
Author(s):  
Yong Hong Ma ◽  
Chong Xiang Zhang ◽  
Pan Zhang
Keyword(s):  
High Speed ◽  
Radio Over Fiber ◽  
Experimental Results ◽  
Arrayed Waveguide Grating ◽  
Waveguide Grating ◽  
Access System ◽  
Ofdm Signal ◽  
The Future ◽  
Optical Ofdm ◽  
Arrayed Waveguide

we demonstrate a wavelength interleaved DWDM Radio-over-Fiber (ROF) system for providing 1-Gb/s OFDM signal in downlink and 1-Gb/s OOK data in uplink simultaneously. In this scheme, we use only one arrayed waveguide grating device at the remote node to realize both the de-multiplexing and multiplexing functions. The experimental results demonstrate that this scheme is feasible to the future broadband high-speed OFDM-ROF access system.

A polymeric optical switch array based on arrayed waveguide grating structure

2007 ◽  
Vol 279 (1) ◽  
pp. 79-82 ◽  
Author(s):  
Guohua Hu ◽  
Yiping Cui ◽  
Binfeng Yun ◽  
Changgui Lu ◽  
Zhuyuan Wang
Keyword(s):  
Optical Switch ◽  
Arrayed Waveguide Grating ◽  
Waveguide Grating ◽  
Grating Structure ◽  
Arrayed Waveguide

Electro-optic polymer waveguide grating with fast tuning capability

2005 ◽  
Vol 44 (17) ◽  
pp. 3442 ◽  
Author(s):  
Yi-Ping Wang ◽  
Jian-Ping Chen ◽  
Xin-Wan Li ◽  
Jun-He Zhou ◽  
Hao Shen ◽  
...  
Keyword(s):  
Waveguide Grating ◽  
Polymer Waveguide ◽  
Electro Optic

Super-high- athermal arrayed waveguide grating with resin-filled trenches in slab region

2004 ◽  
Vol 40 (6) ◽  
pp. 374 ◽  
Author(s):  
K. Maru ◽  
K. Matsui ◽  
H. Ishikawa ◽  
Y. Abe ◽  
S. Kashimura ◽  
...  
Keyword(s):  
Arrayed Waveguide Grating ◽  
Waveguide Grating ◽  
Arrayed Waveguide
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