Digitally tunable optical filters using arrayed-waveguide grating (AWG) multiplexers and optical switches

1997 ◽  
Vol 15 (2) ◽  
pp. 321-327 ◽  
Author(s):  
O. Ishida ◽  
H. Takahashi ◽  
Y. Inoue
Keyword(s):  
Optical Filters ◽  
Optical Switches ◽  
Arrayed Waveguide Grating ◽  
Waveguide Grating ◽  
Tunable Optical Filters ◽  
Arrayed Waveguide

scholarly journals Generalization of an Optical ASA Switch

2019 ◽  
Vol 9 (6) ◽  
pp. 1096
Author(s):  
Bey-Chi Lin
Keyword(s):  
Positive Integer ◽  
Optical Switches ◽  
Wavelength Converters ◽  
Arrayed Waveguide Grating ◽  
Waveguide Grating ◽  
Promising Technology ◽  
Wavelength Channel ◽  
Wavelength Router ◽  
Total Capacity ◽  
Arrayed Waveguide

An arrayed waveguide grating (AWG) is a kind of passive wavelength router, and it is the most promising technology for developing large optical switches. However, AWGs have poor scalability, and using small AWGs to construct a large switch has been done in many prior works. A novel AWG-based switch called ASA (AWG, Space switching, AWG) that does not use wavelength converters has been proposed. It can expand the switch size from N to N2 by using N × N AWGs. In this paper, we generalize the ASA switch by using only N × N AWGs, N × N space switches, and N wavelengths such that the switch size is expanded to Nt for any positive integer t. Since each port of an N × N AWG can transmit up to N wavelengths simultaneously, the total capacity of the generalized ASA switch is extended to be close to Nt+1 × the bandwidth of a wavelength channel, provided that the inputs which are located in the same port position of each input AWG are destined to distinct outputs.

Enhanced Design for AWG-Based Dynamic Reconfigurable Free-Spectral-Range Group Hopping Coder/Decoders to Protect against Eavesdropping

2015 ◽  
Vol 764-765 ◽  
pp. 1240-1244
Author(s):  
Yao Tang Chang ◽  
Chung Wei Tsailin
Keyword(s):  
Spectral Range ◽  
Code Division Multiple Access ◽  
Multiple Access ◽  
Free Spectral Range ◽  
Optical Switches ◽  
Arrayed Waveguide Grating ◽  
Waveguide Grating ◽  
Sequence Code ◽  
Code Division Multiple ◽  
Arrayed Waveguide

To further robust confidentiality protecting against eavesdropping over optical code-division multiple-access (OCDMA) networks, this study improves the robustness of the network toward eavesdropping for encryption/decryption mechanism by using a specified storage register controller controlling optical switches approach in which Free-spectral-range group hopping code is used to generate a specific signature address. This paper presents an enhanced security mechanism to protect spectral-amplitude-coding optical code-division multiple-access (SAC-OCDMA) networks against eavesdropping. This study proposes an alternative to huge code-space size techniques such as wavelength hopping and exchange-encode for network protection against eavesdropping by exploiting the cyclic properties of arrayed-waveguide-grating routers and maximal-length sequence code (M-sequence code). In addition, the network is protected using a wavelength hopping based on optical switches and exchange the encode assignment scheme implemented using the exchange switches before import to arrayed-waveguide-grating routers (AWG).In this scheme, eavesdropper is difficult to solute correct user data bit , whatever there is using brute-force searching or simple energy detector..

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.

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

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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