Pavel Cheben - Academia.edu (original) (raw)
Papers by Pavel Cheben
Proceedings of …, 2005
We present recent advances in the development of a waveguide microspectrometer chip with high spe... more We present recent advances in the development of a waveguide microspectrometer chip with high spectral resolution in the near-infrared part of the spectrum. The microspectrometer is designed for a high index contrast silicon-on-insulator (SOI) platform, where high number of ...
Storage and Retrieval For Image and Video Databases, 2003
We discuss the challenges encountered when scaling down photonic waveguide devices, and demonstra... more We discuss the challenges encountered when scaling down photonic waveguide devices, and demonstrate possible solutions in silicon-on-insulator (SOI) platform. First, sources of waveguide birefringence such as waveguide geometry and stress in the waveguiding layer are discussed. Birefringence sensitivity to inaccuracy of waveguide dimensions is compared for different waveguide geometries, including trapezoidal and rectangular cross-sections. Results show that trapezoidal waveguides are more robust, which makes fabrication tolerances less stringent. Methods for minimizing the waveguide birefringence using stress induced by an over-cladding dielectric film, and by inducing form birefringence through deposition of thin layers of high and low refractive index materials, are discussed. Compact arrayed waveguide grating (AWG) devices are presented, with internal loss of -5.9 dB, crosstalk better than -20 dB, and polarization dependent wavelength shift of <0.05 nm. We discuss and quantify the sources of loss and crosstalk in our AWG devices, and review the methods we have developed for compensation of the polarization dependent wavelength shift, including etched compensator and silicon-oxide-silicon (SOS) compensator. The latter exploits form birefringence of a thin buried oxide layer sandwiched between silicon waveguide core and a silicon over-layer, and is simple to fabricate by standard oxide and amorphous silicon or polysilicon deposition techniques. The calculated loss penalty of the SOS compensator is less than 0.2 dB for both TE and TM polarization.
Diffusion study in tailored gratings recorded in photopolymer glass with high refractive index sp... more Diffusion study in tailored gratings recorded in photopolymer glass with high refractive index species. [Applied Physics Letters 91, 141115 (2007)]. Óscar Martínez-Matos, María L. Calvo, José A. Rodrigo, Pavel Cheben, Francisco del Monte. Abstract. ...
7Th Ieee International Conference on Group Iv Photonics, 2010
Journal of Applied Physics, Jan 15, 2013
ABSTRACT A novel formulation and synthesis method to overcome the thickness limitations in sample... more ABSTRACT A novel formulation and synthesis method to overcome the thickness limitations in samples of photopolymerizable glasses with high refractive index species is presented. The reported method allows the recording of volume holographic diffraction gratings in samples of ∼500 μm thickness with a high optical quality and low scattering. Holographic grating recording is performed in a single coherent light exposure step, resulting in volume gratings of high optical quality. A holographic notch filter implemented in a 500 μm thick photopolymerizable glass with a spectral bandwidth below 0.3 nm and an excellent filter extinction ratio of <−27 dB is also demonstrated.
Advances in Optical Technologies, 2008
Silicon photonic wire evanescent field (PWEF) waveguide sensors have a very high intrinsic respon... more Silicon photonic wire evanescent field (PWEF) waveguide sensors have a very high intrinsic response to molecular adsorption. This response arises from the high refractive index contrast and small size of these waveguides, which in combination cause much of the electric field to be localized to a thin layer adjacent to the waveguide surface. We describe the basic theory of PWEF
Photonics Packaging and Integration III, 2003
Optics Express, 2006
We propose a new method for mode conversion and coupling between an optical fiber and a sub-micro... more We propose a new method for mode conversion and coupling between an optical fiber and a sub-micrometer waveguide using a subwavelength grating (SWG) with a period less than the 1st order Bragg period. The coupler principle is based on gradual modification of the waveguide mode effective index by the SWG effect that at the same time frustrates diffraction and minimizes
2009 6th IEEE International Conference on Group IV Photonics, 2009
2007 9th International Conference on Transparent Optical Networks, 2007
We review recent advances in silicon photonic arrayed waveguide grating and sub-wavelength gratin... more We review recent advances in silicon photonic arrayed waveguide grating and sub-wavelength grating devices developed at the NRC Canada. We present three original microspectrometer concepts, namely a compact 50 channel AWG microspectrometer with a spectral resolution of 1 A and a total chip size of 8 x 8 mm", a Fourier- transform AWG with a markedly increased light gathering capability compared to conventional AWG devices, and an AWG with a resolution significantly increased by inserting a triangular photonic crystal waveguide region in the phased array. Various new sub-wavelength grating waveguide structures will also be presented, including monolithic fibre-chip couplers, anti-reflective waveguide facets and mirrors.
The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003
In this paper, the theoretical and experimental studies of SOI waveguide birefringence as control... more In this paper, the theoretical and experimental studies of SOI waveguide birefringence as controlled by cladding stress properties were reported. The experimental birefringence was obtained from array waveguide grating (AWG) demultiplexer Δλ measurements. A finite element simulator (FEMLAB), to analyse the stress and the corresponding birefringence in SOI ridge waveguides, was used.
NATO Science for Peace and Security Series, 2008
ABSTRACT This paper reviews theory and experiments on silicon photonic wire waveguide evanescent ... more ABSTRACT This paper reviews theory and experiments on silicon photonic wire waveguide evanescent field (PWEF) biosensors. Theoretical considerations and supporting calculations show that sensor response increases both with increasing core-cladding refractive index contrast, and with decreasing waveguide core thickness until a maximum sensor response is achieved. As a result, appropriately designed Si waveguide sensors can have the largest response to superstrate refractive index shifts, and also to surface molecular adsorption, of any commonly available waveguide system. Measurements of Si waveguide sensor response to fluid index change and biotin-avidin binding reactions confirm the predictions of theory.
2007 4th IEEE International Conference on Group IV Photonics, 2007
Proceedings of …, 2005
We present recent advances in the development of a waveguide microspectrometer chip with high spe... more We present recent advances in the development of a waveguide microspectrometer chip with high spectral resolution in the near-infrared part of the spectrum. The microspectrometer is designed for a high index contrast silicon-on-insulator (SOI) platform, where high number of ...
Storage and Retrieval For Image and Video Databases, 2003
We discuss the challenges encountered when scaling down photonic waveguide devices, and demonstra... more We discuss the challenges encountered when scaling down photonic waveguide devices, and demonstrate possible solutions in silicon-on-insulator (SOI) platform. First, sources of waveguide birefringence such as waveguide geometry and stress in the waveguiding layer are discussed. Birefringence sensitivity to inaccuracy of waveguide dimensions is compared for different waveguide geometries, including trapezoidal and rectangular cross-sections. Results show that trapezoidal waveguides are more robust, which makes fabrication tolerances less stringent. Methods for minimizing the waveguide birefringence using stress induced by an over-cladding dielectric film, and by inducing form birefringence through deposition of thin layers of high and low refractive index materials, are discussed. Compact arrayed waveguide grating (AWG) devices are presented, with internal loss of -5.9 dB, crosstalk better than -20 dB, and polarization dependent wavelength shift of <0.05 nm. We discuss and quantify the sources of loss and crosstalk in our AWG devices, and review the methods we have developed for compensation of the polarization dependent wavelength shift, including etched compensator and silicon-oxide-silicon (SOS) compensator. The latter exploits form birefringence of a thin buried oxide layer sandwiched between silicon waveguide core and a silicon over-layer, and is simple to fabricate by standard oxide and amorphous silicon or polysilicon deposition techniques. The calculated loss penalty of the SOS compensator is less than 0.2 dB for both TE and TM polarization.
Diffusion study in tailored gratings recorded in photopolymer glass with high refractive index sp... more Diffusion study in tailored gratings recorded in photopolymer glass with high refractive index species. [Applied Physics Letters 91, 141115 (2007)]. Óscar Martínez-Matos, María L. Calvo, José A. Rodrigo, Pavel Cheben, Francisco del Monte. Abstract. ...
7Th Ieee International Conference on Group Iv Photonics, 2010
Journal of Applied Physics, Jan 15, 2013
ABSTRACT A novel formulation and synthesis method to overcome the thickness limitations in sample... more ABSTRACT A novel formulation and synthesis method to overcome the thickness limitations in samples of photopolymerizable glasses with high refractive index species is presented. The reported method allows the recording of volume holographic diffraction gratings in samples of ∼500 μm thickness with a high optical quality and low scattering. Holographic grating recording is performed in a single coherent light exposure step, resulting in volume gratings of high optical quality. A holographic notch filter implemented in a 500 μm thick photopolymerizable glass with a spectral bandwidth below 0.3 nm and an excellent filter extinction ratio of <−27 dB is also demonstrated.
Advances in Optical Technologies, 2008
Silicon photonic wire evanescent field (PWEF) waveguide sensors have a very high intrinsic respon... more Silicon photonic wire evanescent field (PWEF) waveguide sensors have a very high intrinsic response to molecular adsorption. This response arises from the high refractive index contrast and small size of these waveguides, which in combination cause much of the electric field to be localized to a thin layer adjacent to the waveguide surface. We describe the basic theory of PWEF
Photonics Packaging and Integration III, 2003
Optics Express, 2006
We propose a new method for mode conversion and coupling between an optical fiber and a sub-micro... more We propose a new method for mode conversion and coupling between an optical fiber and a sub-micrometer waveguide using a subwavelength grating (SWG) with a period less than the 1st order Bragg period. The coupler principle is based on gradual modification of the waveguide mode effective index by the SWG effect that at the same time frustrates diffraction and minimizes
2009 6th IEEE International Conference on Group IV Photonics, 2009
2007 9th International Conference on Transparent Optical Networks, 2007
We review recent advances in silicon photonic arrayed waveguide grating and sub-wavelength gratin... more We review recent advances in silicon photonic arrayed waveguide grating and sub-wavelength grating devices developed at the NRC Canada. We present three original microspectrometer concepts, namely a compact 50 channel AWG microspectrometer with a spectral resolution of 1 A and a total chip size of 8 x 8 mm", a Fourier- transform AWG with a markedly increased light gathering capability compared to conventional AWG devices, and an AWG with a resolution significantly increased by inserting a triangular photonic crystal waveguide region in the phased array. Various new sub-wavelength grating waveguide structures will also be presented, including monolithic fibre-chip couplers, anti-reflective waveguide facets and mirrors.
The 16th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2003. LEOS 2003., 2003
In this paper, the theoretical and experimental studies of SOI waveguide birefringence as control... more In this paper, the theoretical and experimental studies of SOI waveguide birefringence as controlled by cladding stress properties were reported. The experimental birefringence was obtained from array waveguide grating (AWG) demultiplexer Δλ measurements. A finite element simulator (FEMLAB), to analyse the stress and the corresponding birefringence in SOI ridge waveguides, was used.
NATO Science for Peace and Security Series, 2008
ABSTRACT This paper reviews theory and experiments on silicon photonic wire waveguide evanescent ... more ABSTRACT This paper reviews theory and experiments on silicon photonic wire waveguide evanescent field (PWEF) biosensors. Theoretical considerations and supporting calculations show that sensor response increases both with increasing core-cladding refractive index contrast, and with decreasing waveguide core thickness until a maximum sensor response is achieved. As a result, appropriately designed Si waveguide sensors can have the largest response to superstrate refractive index shifts, and also to surface molecular adsorption, of any commonly available waveguide system. Measurements of Si waveguide sensor response to fluid index change and biotin-avidin binding reactions confirm the predictions of theory.
2007 4th IEEE International Conference on Group IV Photonics, 2007