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Silicon photonic Bragg-grating couplers for optical communications

Wei Shi, Venkat Veerasubramanian, David V. Plant, Nicolas A. F. Jaeger, Lukas Chrostowski, Atul K. Srivastava
2014 Next-Generation Optical Networks for Data Centers and Short-Reach Links  
These system-orientated devices indicate great potential for large-scale integration of Bragg-grating-defined functions using CMOS-compatible silicon photonics technology.  ...  By a coupler-chirped design with uniform Bragg gratings, we have recently achieved an on-chip, continuously tunable photonic delay line with low insertion loss.  ...  Replacing two-port Bragg gratings with contra-DCs allows direct integration (i.e., without using circulators) with other photonic devices such as lasers and modulators, as well as combining these functions  ... 
doi:10.1117/12.2044096 fatcat:vi2xgwjs3zg6bnzhvhikkxux5i

Tunable transmission filters based on corrugated sidewall Bragg gratings in polymer waveguides

Lin Zhu, Yanyi Huang, W.M.J. Green, A. Yariv
2005 (CLEO). Conference on Lasers and Electro-Optics, 2005.  
We fabricate different bandpass filters based on polymeric waveguide gratings by introducing phase shift defects and integrating with a 3 dB MMI coupler.  ...  We also use thermo-optic effects to dynamically tune the designed filter.  ...  One alternative solution is to introduce phase shift defects in Bragg gratings, and another is to integrate Bragg gratings on the arm of an optical coupler.  ... 
doi:10.1109/cleo.2005.201752 fatcat:doavk6627rg45iiqmxys3k6ure

Widely bandwidth-tunable silicon filter with an unlimited free-spectral range

Jonathan St-Yves, Hadi Bahrami, Philippe Jean, Sophie LaRochelle, Wei Shi
2015 Optics Letters  
This allows add-drop operation without the need of a circulator.  ...  We demonstrate an integrated band-pass filter with the bandwidth continuously tuned across 670 GHz (117-788 GHz) which, to the best of our knowledge, is the widest tuning span ever demonstrated on a silicon  ...  The authors thank Yun Wang and Lukas Chrostowski at the University of British Columbia for the fiber grating coupler design.  ... 
doi:10.1364/ol.40.005471 pmid:26625028 fatcat:7xxtrc7a7bbd5a4gtejpv3unse

Compact OCDMA encoders based on the antisymmetric waveguide Bragg grating

J.M. Castro, I. Djordjevic, L. Minkov, C.M. Greiner, D. Iazikov, T.W. Mossberg, D.F. Geraghty
2006 IEEE Photonics Technology Letters  
In this letter, we use silica-on-silicon antisymmetric waveguide Bragg grating devices to demonstrate compact and versatile OCDMA encoder/decoders.  ...  Optical code-division multiple-access (OCDMA) networks require simple encoders/decoders enabling the integration of optical devices for further development.  ...  Different types of OCDMA have been experimentally demonstrated using fiber Bragg gratings (FBGs) with optical circulators [2] and integrated optics [3] .  ... 
doi:10.1109/lpt.2006.872308 fatcat:l6d7k4y4ofarfo2i3smlcsqnee

Terahertz bandwidth photonic Hilbert transformers based on synthesized planar Bragg grating fabrication

Chaotan Sima, J. C. Gates, C. Holmes, P. L. Mennea, M. N. Zervas, P. G. R. Smith
2013 Optics Letters  
The integrated device is fabricated via a direct UV grating writing technique in a silica-on-silicon platform.  ...  By incorporating a flat-top reflector and Hilbert grating with a waveguide coupler an ultra wideband alloptical single-sideband filter is demonstrated.  ...  PHTs have also been integrated to implement ultra wideband all-optical SSB filters, without the need for optical circulators.  ... 
doi:10.1364/ol.38.003448 pmid:23988981 fatcat:wltw564qdbfqjkubpwv65sdk2a

Coherency-broken Bragg filters: surpassing on-chip rejection limitations [article]

D. Oser, F. Mazeas, X. Le Roux, D. Perez-Galacho, O. Alibart, S. Tanzilli, L. Labonte, D. Marris-Morini, L. Vivien, E. Cassan, C. Alonso-Ramos
2018 arXiv   pre-print
We exploit non-coherent interaction among modal-engineered waveguide Bragg gratings separated by single-mode waveguides to yield effective cascading, even in the presence of fabrication errors.  ...  Due to coherent interactions, unwanted phase-shifts result in detrimental destructive interferences that distort the filter response, whatever the chosen strategy (resonators, interferometers, Bragg filters  ...  This is the largest optical rejection ever reported for an all-passive silicon photonic wavelength filter.  ... 
arXiv:1806.08833v1 fatcat:ifceqxnlzrg6tettvht5z4mwoi

Silicon photonic grating-assisted, contra-directional couplers

Wei Shi, Xu Wang, Charlie Lin, Han Yun, Yang Liu, Tom Baehr-Jones, Michael Hochberg, Nicolas A. F. Jaeger, Lukas Chrostowski
2013 Optics Express  
These contra-DC devices enable on-chip integration of Bragg-grating-defined functions without using circulators and have great potential for applications such as wavelength-division multiplexing networks  ...  We demonstrate, in both theory and experiment, 4-port, electrically tunable photonic filters using silicon contra-directional couplers (contra-DCs) with uniform and phase-shifted waveguide Bragg gratings  ...  Replacing two-port Bragg gratings with contra-DCs allows direct integration (i.e., without using circulators) with other photonic devices such as lasers and modulators, as well as the combining of these  ... 
doi:10.1364/oe.21.003633 pmid:23481820 fatcat:776ix7xinfa2hehgux57sxsqva

Spectral phase encoders for optical CDMA using anti-symmetric gratings

J.M. Castro, D.F. Geraghty
2006 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference  
To simplify its implementation we propose novel and compact bipolar optical encoders based on the recently demonstrated anti-symmetric grating.  ...  Integrated encoders can be fabricated in silica-on-silicon using antisymmetric Bragg gratings [5] .  ...  These encoders consist on an array of N (code length) anti-symmetric Bragg gratings written in slots with separation L c .  ... 
doi:10.1109/ofc.2006.215546 fatcat:uig5dmhfnfemblnej4mqf2nve4

Subwavelength-grating contradirectional couplers for large stopband filters

Dominique Charron, Jonathan St-Yves, Omid Jafari, Sophie LaRochelle, Wei Shi
2018 Optics Letters  
Manipulating the coupling coefficient a t subwavelength scales provides an additional degree of freedom in designing integrated Bragg gratings.  ...  A four-port Bragg resonating filter m ade o f a p hase-shifted B ragg grating SWG contra-DC is also demonstrated for narrowband (near 100 GHz) filtering.  ...  This is to our knowledge the highest bandwidth achieved for an add-drop filter on a silicon chip.  ... 
doi:10.1364/ol.43.000895 pmid:29444021 fatcat:e4kvvhqdrzahpm7n6zxfjjzswq

Circulant preconditioning in the volume integral equation method for silicon photonics [article]

Samuel P. Groth, Athanasios G. Polimeridis, Alexandra Tambova, Jacob K. White
2019 arXiv   pre-print
Recently, the volume integral equation (VIE) approach has been proposed as an efficient simulation tool for silicon photonics applications [J. Lightw. Technol. 36, 3765 (2018)].  ...  For more complex photonics structures, such as Bragg gratings, directional couplers, and disk resonators, we generalize our preconditioning strategy via geometrical partitioning (leading to a block-diagonal  ...  Bragg grating -modifying circulant preconditioning for inhomogeneous structures A geometry of practical interest in silicon photonics is that of a Bragg grating.  ... 
arXiv:1903.07884v1 fatcat:oaydoqfm4zazxgljhnuy24qmcy

Chip-scale dispersion engineering using chirped vertical gratings

D. T. H. Tan, K. Ikeda, R. E. Saperstein, B. Slutsky, Y. Fainman
2008 Optics Letters  
A strongly coupled, chirped Bragg grating made by sinusoidally modulating the sidewalls of a silicon waveguide is designed, fabricated, and experimentally characterized.  ...  In this Letter, we present the design, fabrication, and experimental validation of a novel compact GVD device implemented with a sidewall-modulated chirped Bragg grating (CBG) in a silicon waveguide.  ...  As an example, a 300 nm by 500 nm silicon waveguide exhibits GVD of 1100 ps/ nm/ km [20] .  ... 
doi:10.1364/ol.33.003013 pmid:19079525 fatcat:sk476ndo3rflrakitgm6b4kau4

Polymeric multi-channel bandpass filters in phase-shifted Bragg waveguide gratings by direct electron beam writing

Lin Zhu, Yanyi Huang, William M. J. Green, Amnon Yariv
2004 Optics Express  
We apply direct electron beam writing to fabricate corrugated sidewall Bragg gratings in polymer waveguides and demonstrate multichannel passband filters based on a phase-shifted design.  ...  In order to reduce the system cost, bandpass transmission filters using phase shifts in Bragg gratings have been proposed since they can eliminate the need for a circulator.  ...  Wang reported the fabrication of a very narrow band phase-shifted Bragg grating filter, using a 457nm Ar + laser to post process the uniform waveguide gratings through the photobleaching effect [5] .  ... 
doi:10.1364/opex.12.006372 pmid:19488284 fatcat:h5wzcrizofarjbmebksryoys5m

Hybrid integrated tunable optical transmitter subsystem on a chip

Louay A. Eldada, Alexander Newburgh, Junichiro Fujita, Antonije M. Radojevic, Reinald Gerhardt, David J. Robbins, Ghassan E. Jabbour
2002 Silicon-based and Hybrid Optoelectronics IV  
This subsystem on a chip includes a laser chip coupled to a thermo-optically tunable planar polymeric filter resulting in a tunable external cavity laser; an integrated magneto-optic isolator consisting  ...  Although today lasers and modulators could be integrated together on a single chip, an integrated component of this type would not be useful because the absence of an isolator between the two elements  ...  Thermo-Optic Tunable Filters Tunable filters can be based on Bragg gratings, diffraction gratings, arrayed waveguide gratings (AWG's), microring resonators, or photonic crystals.  ... 
doi:10.1117/12.463843 fatcat:sgfjoi7gpzg2ravsb737fjma2e

Tunable nanophotonic delay lines using linearly chirped contradirectional couplers with uniform Bragg gratings

Wei Shi, Venkat Veerasubramanian, David Patel, David V. Plant
2014 Optics Letters  
This add-drop design enables monolithic integration of grating-based delay lines without using optical circulators.  ...  We demonstrate an integrated tunable optical delay line in grating-assisted contradirectional couplers using a CMOS-compatible photonic technology.  ...  Chirped waveguide Bragg gratings have low losses (<10 dB∕ns) [6] , and thus are attractive for photonic integrated circuits without optical amplification.  ... 
doi:10.1364/ol.39.000701 pmid:24487903 fatcat:uqg5g5wx3vf7rbchosuowe4c54

The evolution of passive devices in WDM networks

A. Janssen
2001 IEEE Transactions on Advanced Packaging  
The increasing demands for lower costs and functionality are the motivation toward integration, automated assembly and versatility of technology. Index Terms-Wavelength division multiplexing.  ...  Fig. 4 shows an example of the performance of a flattened 100 GHz Bragg grating filter.  ...  Many technologies have been explored including multilayer dielectrics, fiber Bragg gratings, waveguide phasors implemented in silica/silicon, glass on silicon, polymer on silicon, InP waveguide phasors  ... 
doi:10.1109/6040.982849 fatcat:qx733ia6onf65ippdmyttoxhh4
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