Search query: High Order Bragg grating

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abstract: Abstract In order to obtain narrow linewidth semiconductor laser around 1564 nm, we design a distributed Bragg reflector (DBR) laser with high order Bragg gratings (HOBGs) using butterfly encapsulation. The DBR laser is fabricated only by i line lithography technology with grating period of 4. 84 m m groove width of 1. 5 m m and grating length of 72 m m on a strip width of 4 m m The 1mm long devices achieved an output power of 9.9 mW and a side mode suppression ratio (SMSR) more than 30 dB without facet coating at an injection current of 80 mA. The lasers showed ultra narrow Lorentz linewidth of 70 kHz. This paper provides a simple method for large scale production of narrow linewidth semiconductor lasers.
author_names: Hong Chen

Peng Jia

Chao Chen

Li Qin

Yongyi Chen

Youwen Huang

Yongqiang Ning

Lijun Wang
title: Narrow linewidth DBR laser based on high order Bragg grating defined by i line lithography
venue: Optics Communications
year: 2019

abstract: We present a single mode, single polarization, distributed feedback liquid dye laser, based on a short high order Bragg grating defined in a single polymer layer between two glass substrates. In this device we obtain single mode operation in a multimode structure by means of transverse mode discrimination with antiguiding segments. The laser is fabricated using microfabrication technology, is pumped by a pulsed frequency doubled Nd:YAG laser, and emits narrow line width light in the chip plane at 577 nm. The output from the laser is coupled into integrated planar waveguides defined in the same polymer _lm. The laser device is thus well suited for integration, for example, into polymer based lab on a chip microsystems.
author_names: Soren Balslev

Anders Kristensen
title: Microfluidic single mode laser using high order Bragg grating and antiguiding segments.
venue: Optics express
year: 2005

abstract: A convenient method using a commercially available ruled grating for precise and overall diameter measurement of optical nanofibers (ONFs) is presented. We form a composite Bragg reflector with a micronscale period by dissolving aluminum coating, slicing the grating along ruling lines, and mounting it on an ONF. The resonant wavelengths of high order Bragg reflections possess fiber diameter dependence, enabling nondestructive measurement of the ONF diameter profile. This method provides an easy and economic diagnostic tool for wide varieties of ONF based applications.
author_names: Ming Zhu

Yaoke Wang

Yi-zhi Sun

Lijian Zhang

Wei Ding
title: Diameter measurement of optical nanofiber based on high order Bragg reflections using a ruled grating.
venue: Optics letters
year: 2018

abstract: Aiming for structural health monitoring applications in harsh environments, a high order sapphire fiber Bragg grating (HO SFBG) written with a femtosecond (fs) laser in a large diameter sapphire fiber is demonstrated. The radial refractive index modulation area induced by scanning exposure is greater than 60% of the fiber cross section area. The large mode overlapping area leads to a transmission resonance strength of approximately 3.0 dB. As demonstrated by numerical simulations of mode excitation and multimode resonance, each mode resonance is significantly superposed when the coupling coefficient is above 0.0005. A study of the high temperature and strain sensing characteristics of the HO SFBG shows that each high order resonance has different response characteristics. This type of large diameter SFBG has important application potential for high temperature smart materials with embedded fiber sensors.
author_names: Chao Chen

Xuan-yu Zhang

Yong-Sen Yu

Wei-Hua Wei

Qi Guo

Li Qin

Yongqiang Ning

Li-jun Wang

Hong-Bo Sun
title: Femtosecond Laser Inscribed High Order Bragg Gratings in Large Diameter Sapphire Fibers for High Temperature and Strain Sensing
venue: Journal of Lightwave Technology
year: 2018

abstract: In order to obtain narrow linewidth semiconductor laser around 1564 nm, we design a distributed Bragg reflector (DBR) laser based on surface etched high order Bragg gratings (SE HOBGs) To achieve C band Bragg resonance wavelength selection, the laser is designed as a grating period of 4.84 mm, an etched groove depth of 1.2 mm, a grating duty cycle of 69% a total grating length of 72 mm, and a ridge waveguide width of 4.0 mm. For the DBR laser with cavity length of 1 mm, the output power reaches to 9.9 mW/facet and a 1564 nm laser output with a side mode suppression ratio (SMSR) more than 30 dB at an injection current of 80 mA. We measured and analyzed the phase/frequency noise, linewidth characteristics and the relative intensity noise (RIN) characteristics of the laser in detail. The lasers showed narrow Lorentz linewidth of 70 kHz. This paper provides a simple method for large scale production of narrow linewidth semiconductor lasers.
author_names: Chao Chen

Peng Jia

Li Qin

Yongyi Chen

Hong Chen

Yongqiang Ning

Li-jun Wang
title: Noise and linewidth characterizations of DBR laser based on surface etched high order Bragg gratings
venue: Applied Optics and Photonics China
year: 2019

abstract: We demonstrate a single mode distributed feedback liquid dye laser, based on a short 133 'rd order Bragg grating defined in a single polymer layer between two glass substrates.
author_names: Soren Balslev

Anders Kristensen
title: High order Bragg grating microfluidic dye laser
venue: Conference on Lasers and Electro Optics, 2004. (CLEO)
year: 2004

abstract: A corrugated high order Bragg grating was fabricated on a silicon on insulator(SOI) ridge waveguide,with the width of 2 mm and the ridge height of 935 nm,by photolithography.The core thickness of the SOI wafers is 2 mm.The etching depth of the grating is 565 nm and 935 nm,respectively.The extinction ratio of the device is above 10 dB in the wavelength range 1 540~1 640 nm,demonstrating the filterability of high order Bragg grating on SOI ridge waveguides.Experimentally and theoretically,the coupling coefficient of high order Bragg grating was proved to increase with the etching depth and a higher grating loss would be coused by the increase of the periodicity of grating.
author_names: Zhao Chun-hua
title: Corrugated High order Bragg Grating on Silicon on insulator Ridge Waveguides Fabricated by Photolithography
year: 2009

abstract: An integrated passband optical filter based on a high order phase shifted Bragg grating (BG) realized in siliconon insulator technology is presented. Five half wave cavities are placed between six BG mirrors defined by laterally corrugating a strip silicon waveguide through electron beam lithographic process. The BG mirrors are dimensioned in order to provide the proper reflectivity at Bragg wavelength such to tailor the spectral transmission of the multi cavity filter. A passband window within a 1 THz stopband region having nearly Gaussian transfer function with a 3dB bandwidth of ~25 GHz, low insertion loss of less than 1 dB, minimum stopband attenuation of ~35 dB, and a passband to stopband transition bandwidth of ~30 GHz is observed. These features, which are unreported for such class of structures, illustrate the potentials of this approach for realizing FSR free bandpass optical filters with arbitrary bandwidth, strong out of band rejection, and fast roll off. Effects of waveguide corrugation depth on the stopband width has also been investigated.
author_names: Claudio Porzi

Antonella Bogoni
title: Integrated Passband Optical Filter with High Order Phase Shifted Bragg Grating in Silicon on Insulator Technology
year: 2018

abstract: An integrated high order phase shifted Bragg grating, comprising six quarter wave sections between Bragg grating mirrors in a laterally corrugated strip waveguide has been realized in silicon on insulator technology. A box like transmission window is created within the 10 nm wide grating reflection band, realizing a sharp bandpass optical filter with out of band rejection exceeding 40 dB and a steep roll off of ~300 dB/nm in the transition band. The sharp optical filter has been experimentally tested in microwave photonics (MWP) signal processing applications, namely spectral separation of an optical sideband comprising 1.25 Gb/s data from a 15 GHz spaced carrier, and sideband suppression for dispersion compensation in a radio over fiber link. The results of the characterizations indicate negligible power penalty in terms of bit error rate for the sideband separation and robust mitigation of dispersion induced transmission impairment. The device has an ultrasmall footprint of ~450 x 0.5 mm2, and can be monolithically integrated with germanium photodiodes or silicon modulators as well as other passive subsystems to implement advanced on chip MWP signal processing functionalities.
author_names: Claudio Porzi

Giovanni Serafino

Philippe Velha

Paolo Ghelfi

Antonella Bogoni
title: Integrated SOI High Order Phase Shifted Bragg Grating for Microwave Photonics Signal Processing
venue: Journal of Lightwave Technology
year: 2017

abstract: This paper presents a novel framework for probabilistic crack size quantification using fiber Bragg grating (FBG) sensors. The key idea is to use a high order extended finite element method (XFEM) together with a transfer (T) matrix method to analyze the reflection intensity spectra of FBG sensors, for various crack sizes. Compared with the standard FEM, the XFEM offers two superior capabilities: (i) a more accurate representation of fields in the vicinity of the crack tip singularity and (ii) alleviation of the need for costly re meshing as the crack size changes. Apart from the classical four term asymptotic enrichment functions in XFEM, we also propose to incorporate higher order functions, aiming to further improve the accuracy of strain fields upon which the reflection intensity spectra are based. The wavelength of the reflection intensity spectra is extracted as a damage sensitive quantity, and a baseline model with five parameters is established to quantify its correlation with the crack size. In order to test the feasibility of the predictive model, we design FBG sensor based experiments to detect fatigue crack growth in structures. Furthermore, a Bayesian method is proposed to update the parameters of the baseline model using only a few available experimental data points (wavelength versus crack size) measured by one of the FBG sensors and an optical microscope, respectively. Given the remaining data points of wavelengths, even measured by FBG sensors at different positions, the updated model is shown to give crack size predictions that match well with the experimental observations.
author_names: Jingjing He

Jinsong Yang

Yongxiang Wang

Haim Waisman

Weifang Zhang
title: Probabilistic Model Updating for Sizing of Hole Edge Crack Using Fiber Bragg Grating Sensors and the High Order Extended Finite Element Method
venue: Sensors
year: 2016