Pub Date : 2016-10-01DOI: 10.3807/JOSK.2016.20.5.614
Jae Suk Yang, Jae-Hyeung Park, O. Beom-hoan, Se-Guen Park, S. G. Lee
In this paper, we propose a novel differential equation method for designing a total internal reflection (TIR) LED lens with double freeform surfaces. A complete set of simultaneous differential equations for the method is derived from the condition for minimizing the Fresnel loss, illumination models, Snell's Law of ray propagation, and a new constraint on the incident angle of a ray on the light-exiting surface of the lens. The last constraint is essential to complete the set of simultaneous differential equations. By adopting the TIR structure and applying the condition for minimizing the Fresnel loss, it is expected that the proposed TIR LED lens can have a high luminous flux efficiency, even though its beam-spread angle is narrow. To validate the proposed method, three TIR LED lenses with beam-spread angles of less than 22.6° have been designed, and their performances evaluated by ray tracing. Their luminous flux efficiencies could be obviously increased by at least 35% and 5%, compared to conventional LED lenses with a single freeform surface and with double freeform surfaces, respectively.
{"title":"Design Method for a Total Internal Reflection LED Lens with Double Freeform Surfaces for Narrow and Uniform Illumination","authors":"Jae Suk Yang, Jae-Hyeung Park, O. Beom-hoan, Se-Guen Park, S. G. Lee","doi":"10.3807/JOSK.2016.20.5.614","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.5.614","url":null,"abstract":"In this paper, we propose a novel differential equation method for\u0000 designing a total internal reflection (TIR) LED lens with double freeform\u0000 surfaces. A complete set of simultaneous differential equations for the\u0000 method is derived from the condition for minimizing the Fresnel loss,\u0000 illumination models, Snell's Law of ray propagation, and a new\u0000 constraint on the incident angle of a ray on the light-exiting surface of\u0000 the lens. The last constraint is essential to complete the set of\u0000 simultaneous differential equations. By adopting the TIR structure and\u0000 applying the condition for minimizing the Fresnel loss, it is expected\u0000 that the proposed TIR LED lens can have a high luminous flux efficiency,\u0000 even though its beam-spread angle is narrow. To validate the proposed\u0000 method, three TIR LED lenses with beam-spread angles of less than\u0000 22.6° have been designed, and their performances evaluated by ray\u0000 tracing. Their luminous flux efficiencies could be obviously increased by\u0000 at least 35% and 5%, compared to conventional LED lenses with a single\u0000 freeform surface and with double freeform surfaces,\u0000 respectively.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"614-622"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.3807/JOSK.2016.20.5.633
J. Ha, D. Kim, Dong Hyun Kim
In a dual lens stereoscopic camera, a convergence point determines the stereopsis effects of a video. When a user zooms an object, a convergence point is fixed since it is not coupled with a zoom function. Due to the fixed convergence point, it is possible for a zoom to cause the excessive binocular disparity resulting in visual discomfort. In this paper, to solve this problem, we build the relational model including all phenomena possible to arise and propose the adjustment methods of a convergence point by the positions of a focus, an object and a convergence point. We also evaluate the experiments measuring a binocular disparity and the subjective test to investigate the visual comfort. The results show that one of the proposed methods produced more comfortable 3D images to viewers than the others.
{"title":"Convergence Point Adjustment Improving Visual Discomfort for a Zoom on a Stereoscopic Camera","authors":"J. Ha, D. Kim, Dong Hyun Kim","doi":"10.3807/JOSK.2016.20.5.633","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.5.633","url":null,"abstract":"In a dual lens stereoscopic camera, a convergence point determines the stereopsis effects of a video. When a user zooms an object, a convergence point is fixed since it is not coupled with a zoom function. Due to the fixed convergence point, it is possible for a zoom to cause the excessive binocular disparity resulting in visual discomfort. In this paper, to solve this problem, we build the relational model including all phenomena possible to arise and propose the adjustment methods of a convergence point by the positions of a focus, an object and a convergence point. We also evaluate the experiments measuring a binocular disparity and the subjective test to investigate the visual comfort. The results show that one of the proposed methods produced more comfortable 3D images to viewers than the others.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"633-640"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70141359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.3807/JOSK.2016.20.5.557
Ling Liu, S. Xiao, Meihua Bi, Lu Zhang
In this paper, for the first time, the transmission performances of long-haul 100-Gb/s direct detection optical OFDM (DDO-OFDM) and coherent optical OFDM (CO-OFDM) wavelength division multiplexing (WDM) systems are compared by simulation. It provides specific guides for system parameter selection to get a high-performance and cost-effective OFDM WDM system. Specifically, the comparison involves three aspects: launched power is investigated to achieve better system performance; laser linewidth is numerically investigated to choose cost-effective laser; system dispersion tolerances with different laser linewidths are analyzed to further reveal the advantages and disadvantages of these two detecting methods, direct detection and coherent detection, in long-haul OFDM WDM system.
本文首次通过仿真比较了远距离100gb /s直接检测光OFDM (do -OFDM)和相干光OFDM (CO-OFDM)波分复用(WDM)系统的传输性能。为实现高性能、低成本的OFDM WDM系统提供了系统参数选择的具体指导。具体比较包括三个方面:对发射功率进行考察，以获得更好的系统性能;对激光线宽进行数值研究，以选择性价比高的激光器;分析了不同激光线宽下的系统色散容差，进一步揭示了直接检测和相干检测两种检测方法在远距离OFDM WDM系统中的优缺点。
{"title":"Comparison Study of Long-haul 100-Gb/s DDO-OFDM and CO-OFDM WDM Systems","authors":"Ling Liu, S. Xiao, Meihua Bi, Lu Zhang","doi":"10.3807/JOSK.2016.20.5.557","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.5.557","url":null,"abstract":"In this paper, for the first time, the transmission performances of\u0000 long-haul 100-Gb/s direct detection optical OFDM (DDO-OFDM) and coherent\u0000 optical OFDM (CO-OFDM) wavelength division multiplexing (WDM) systems are\u0000 compared by simulation. It provides specific guides for system parameter\u0000 selection to get a high-performance and cost-effective OFDM WDM system.\u0000 Specifically, the comparison involves three aspects: launched power is\u0000 investigated to achieve better system performance; laser linewidth is\u0000 numerically investigated to choose cost-effective laser; system dispersion\u0000 tolerances with different laser linewidths are analyzed to further reveal\u0000 the advantages and disadvantages of these two detecting methods, direct\u0000 detection and coherent detection, in long-haul OFDM WDM system.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"1 1","pages":"557-562"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140563","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.3807/JOSK.2016.20.5.567
Yong Soo Lee, Chung-Ghiu Lee, Yongmin Jung, M. Oh, Soeun Kim
We propose a highly birefringent and dispersion compensating photonic crystal fiber based on a double line defect core. Using a finite element method (FEM) with a perfectly matched layer (PML), it is demonstrated that it is possible to obtain broadband large negative dispersion of about -400 to -427 ps/(nm.km) covering all optical communication bands (from O to U band) and to achieve the dispersion coefficient of -425 ps/(nm.km) at 1.55μm. In addition, the highest birefringence of the proposed PCF at 1.55 μm is 1.92 x 10-2 and the value of birefringence from the wavelength of 1.26 to 1.8 μm (covering O to U bands) is about 1.8 x 10-2 to 1.92 x 10-2. It is confirmed that from the simulation results, the confinement loss of the proposed PCF is always less than 10-3 dB/km at 1.55 μm with seven fiber rings of air holes in the cladding.
{"title":"Highly Birefringent and Dispersion Compensating Photonic Crystal Fiber Based on Double Line Defect Core","authors":"Yong Soo Lee, Chung-Ghiu Lee, Yongmin Jung, M. Oh, Soeun Kim","doi":"10.3807/JOSK.2016.20.5.567","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.5.567","url":null,"abstract":"We propose a highly birefringent and dispersion compensating\u0000 photonic crystal fiber based on a double line defect core. Using a finite\u0000 element method (FEM) with a perfectly matched layer (PML), it is\u0000 demonstrated that it is possible to obtain broadband large negative\u0000 dispersion of about -400 to -427 ps/(nm.km) covering all optical\u0000 communication bands (from O to U band) and to achieve the dispersion\u0000 coefficient of -425 ps/(nm.km) at 1.55μm. In addition, the highest\u0000 birefringence of the proposed PCF at 1.55 μm is 1.92 x\u0000 10-2 and the value of birefringence from the wavelength of\u0000 1.26 to 1.8 μm (covering O to U bands) is about 1.8 x\u0000 10-2 to 1.92 x 10-2. It is confirmed that from\u0000 the simulation results, the confinement loss of the proposed PCF is always\u0000 less than 10-3 dB/km at 1.55 μm with seven fiber rings of\u0000 air holes in the cladding.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"567-574"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.3807/JOSK.2016.20.5.586
Kyong-Hwan Oh, Seongkwan Hong, O. Kwon
This paper proposes a luminance compensation method using optical sensors to achieve high luminance uniformity of active matrix organic light-emitting diode (AMOLED) displays. The proposed method compensates for the non-uniformity of luminance by capturing the luminance of entire pixels and extracting the characteristic parameters. Data modulation using the extracted characteristic parameters is performed to improve luminance uniformity. In addition, memory size is optimized by selecting an optimal bit depth of the extracted characteristic parameters according to the trade-off between the required memory size and luminance uniformity. To verify the proposed compensation method with the optimized memory size, a 40-inch 1920x1080 AMOLED display with a target maximum luminance of 350 cd/m2 is used. The proposed compensation method considering a 4σ range of luminance reduces luminance error from ± 38.64%, ± 36.32%, and ± 43.12% to ± 2.68%, ± 2.64%, and ± 2.76% for red, green, and blue colors, respectively. The optimal bit depth of each characteristic parameter is 6-bit and the total required memory size to achieve high luminance uniformity is 74.6 Mbits.
{"title":"A Luminance Compensation Method Using Optical Sensors with Optimized Memory Size for High Image Quality AMOLED Displays","authors":"Kyong-Hwan Oh, Seongkwan Hong, O. Kwon","doi":"10.3807/JOSK.2016.20.5.586","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.5.586","url":null,"abstract":"This paper proposes a luminance compensation method using optical sensors to achieve high luminance uniformity of active matrix organic light-emitting diode (AMOLED) displays. The proposed method compensates for the non-uniformity of luminance by capturing the luminance of entire pixels and extracting the characteristic parameters. Data modulation using the extracted characteristic parameters is performed to improve luminance uniformity. In addition, memory size is optimized by selecting an optimal bit depth of the extracted characteristic parameters according to the trade-off between the required memory size and luminance uniformity. To verify the proposed compensation method with the optimized memory size, a 40-inch 1920x1080 AMOLED display with a target maximum luminance of 350 cd/m2 is used. The proposed compensation method considering a 4σ range of luminance reduces luminance error from ± 38.64%, ± 36.32%, and ± 43.12% to ± 2.68%, ± 2.64%, and ± 2.76% for red, green, and blue colors, respectively. The optimal bit depth of each characteristic parameter is 6-bit and the total required memory size to achieve high luminance uniformity is 74.6 Mbits.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"586-592"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-10-01DOI: 10.3807/JOSK.2016.20.5.593
H. Moon, C. Lim
Operation properties, such as output power, beam radius, and crystal temperature rise were investigated in a diode-pumped edge-cooled monolithic Yb:YAG laser with ~ 4 W pumping level. The output power showed saturation behavior because of severe temperature rise and poor spatial overlapping between pump beam and lasing mode. Face cooling geometry by using a sapphire plate was also investigated. No apparent saturation behavior in output power was observed due to the reduced temperature rise, which could be attributed to efficient heat removal through the crystal-sapphire interface.
{"title":"Cooling Geometry Dependent Operation Properties in a Diode End-Pumped Monolithic Yb:YAG Laser","authors":"H. Moon, C. Lim","doi":"10.3807/JOSK.2016.20.5.593","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.5.593","url":null,"abstract":"Operation properties, such as output power, beam radius, and crystal temperature rise were investigated in a diode-pumped edge-cooled monolithic Yb:YAG laser with ~ 4 W pumping level. The output power showed saturation behavior because of severe temperature rise and poor spatial overlapping between pump beam and lasing mode. Face cooling geometry by using a sapphire plate was also investigated. No apparent saturation behavior in output power was observed due to the reduced temperature rise, which could be attributed to efficient heat removal through the crystal-sapphire interface.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"593-600"},"PeriodicalIF":0.0,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-25DOI: 10.3807/JOSK.2016.20.4.464
Hyuek-Jae Lee
All-optical non-return-to-zero (NRZ) -toreturn-to-zero (RZ) data-format conversion has been successfully demonstrated using a semiconductor optical amplifier in a fiber-loop mirror (so-called SOA-loop mirror) with a continuous-wave (CW) holding beam. The converted RZ signal after pulse compression has been used to create a 40 Gb/s OTDM (Optical Time Division Multiplexing) signal. Here is proposed an NRZ-to-RZ conversion method without any additional optical clocks, unlike conventional methods based on optical AND logic. In addition, it has the merit of operating at various bit-rate speeds without any controlling device. Moreover, it has a simple structure, and it can be used for all-optical bit-rate-flexible clock recovery.
{"title":"All-Optical Bit-Rate Flexible NRZ-to-RZ Conversion Using an SOA-Loop Mirror and a CW Holding Beam","authors":"Hyuek-Jae Lee","doi":"10.3807/JOSK.2016.20.4.464","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.4.464","url":null,"abstract":"All-optical non-return-to-zero (NRZ) -toreturn-to-zero (RZ) data-format conversion has been successfully demonstrated using a semiconductor optical amplifier in a fiber-loop mirror (so-called SOA-loop mirror) with a continuous-wave (CW) holding beam. The converted RZ signal after pulse compression has been used to create a 40 Gb/s OTDM (Optical Time Division Multiplexing) signal. Here is proposed an NRZ-to-RZ conversion method without any additional optical clocks, unlike conventional methods based on optical AND logic. In addition, it has the merit of operating at various bit-rate speeds without any controlling device. Moreover, it has a simple structure, and it can be used for all-optical bit-rate-flexible clock recovery.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"464-469"},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-25DOI: 10.3807/JOSK.2016.20.4.515
Leihong Zhang, Liangyu Dong, Z. Dawei, Xiumin Gao, Xiuhua Ma
Spectral reflectance is sparse in space, and while the traditional spectral-reconstruction algorithm does not make full use of this characteristic sparseness, the compressive sensing algorithm can make full use of it. In this paper, on the basis of analyzing compressive sensing based on the orthogonal matching pursuit algorithm, a new algorithm based on the Dice matching criterion is proposed. The Dice similarity coefficient is introduced, to calculate the correlation coefficient of the atoms and the residual error, and is used to select the atoms from a library. The accuracy of Spectral reconstruction based on the pseudo-inverse method, Wiener estimation method, OMP algorithm, and DOMP algorithm is compared by simulation on the MATLAB platform and experimental testing. The result is that spectral-reconstruction accuracy based on the DOMP algorithm is higher than for the other three methods. The root-mean-square error and color difference decreases with an increasing number of principal components. The reconstruction error decreases as the number of iterations increases. Spectral reconstruction based on the DOMP algorithm can improve the accuracy of color-information replication effectively, and high-accuracy color-information reproduction can be realized.
{"title":"Study of Spectral Reflectance Reconstruction Based on an Algorithm for Improved Orthogonal Matching Pursuit","authors":"Leihong Zhang, Liangyu Dong, Z. Dawei, Xiumin Gao, Xiuhua Ma","doi":"10.3807/JOSK.2016.20.4.515","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.4.515","url":null,"abstract":"Spectral reflectance is sparse in space, and while the traditional spectral-reconstruction algorithm does not make full use of this characteristic sparseness, the compressive sensing algorithm can make full use of it. In this paper, on the basis of analyzing compressive sensing based on the orthogonal matching pursuit algorithm, a new algorithm based on the Dice matching criterion is proposed. The Dice similarity coefficient is introduced, to calculate the correlation coefficient of the atoms and the residual error, and is used to select the atoms from a library. The accuracy of Spectral reconstruction based on the pseudo-inverse method, Wiener estimation method, OMP algorithm, and DOMP algorithm is compared by simulation on the MATLAB platform and experimental testing. The result is that spectral-reconstruction accuracy based on the DOMP algorithm is higher than for the other three methods. The root-mean-square error and color difference decreases with an increasing number of principal components. The reconstruction error decreases as the number of iterations increases. Spectral reconstruction based on the DOMP algorithm can improve the accuracy of color-information replication effectively, and high-accuracy color-information reproduction can be realized.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"515-523"},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-25DOI: 10.3807/JOSK.2016.20.4.500
Zhao Zhang, Z. Wan, Xian-sheng Li, Hong-xing Liu, Jing-xu Sun, Ze-xun Liu, Ya-min Wang, Jianwei Ren, J. Ren
Integrating spheres play a central role in the radiometric calibration of remote sensors. With the development of the wide field of view (FOV) remote sensors, aperture diameters of remote sensors are becoming larger and larger. To satisfy the radiometric calibration requirements of full FOV and full aperture, an 8000mm diameter large aperture integrating sphere uniform source with a variable exit port was designed and manufactured. This integrating sphere will be used for pre-launch test and radiometric calibration of remote satellites. In this paper, optical theories were used to design the output spectral radiance. The LightTools software based on ray-tracing simulation method was used to determine the best combination and distribution of inner light sources. A spectral experiment was made to verify the spectral radiance design. To reduce the influence of longtime power-on, a new characteristic measurement method was developed to obtain the radiation characteristic of the integrating sphere, which could greatly improve the measuring efficiency. This method could also be applied to measure other large aperture uniform sources. The obtained results indicate that the spatial uniformity is 98.35%, and the angular uniformity at center position is 98.78%.
{"title":"Design and Characteristic Measurement of 8000 mm Large Aperture Integrating Sphere","authors":"Zhao Zhang, Z. Wan, Xian-sheng Li, Hong-xing Liu, Jing-xu Sun, Ze-xun Liu, Ya-min Wang, Jianwei Ren, J. Ren","doi":"10.3807/JOSK.2016.20.4.500","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.4.500","url":null,"abstract":"Integrating spheres play a central role in the radiometric calibration of remote sensors. With the development of the wide field of view (FOV) remote sensors, aperture diameters of remote sensors are becoming larger and larger. To satisfy the radiometric calibration requirements of full FOV and full aperture, an 8000mm diameter large aperture integrating sphere uniform source with a variable exit port was designed and manufactured. This integrating sphere will be used for pre-launch test and radiometric calibration of remote satellites. In this paper, optical theories were used to design the output spectral radiance. The LightTools software based on ray-tracing simulation method was used to determine the best combination and distribution of inner light sources. A spectral experiment was made to verify the spectral radiance design. To reduce the influence of longtime power-on, a new characteristic measurement method was developed to obtain the radiation characteristic of the integrating sphere, which could greatly improve the measuring efficiency. This method could also be applied to measure other large aperture uniform sources. The obtained results indicate that the spatial uniformity is 98.35%, and the angular uniformity at center position is 98.78%.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"500-509"},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140757","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-08-25DOI: 10.3807/JOSK.2016.20.4.470
Huatao Zhu, Rong Wang, T. Pu, Tao Fang, P. Xiang, Huihui Zhu
In this paper, the effects of filter parameters on a supercontinuum-based all-optical thresholder are experimentally investigated. By tuning the filter parameters, the power transfer function and power transmission function are tailored. The experimental results show that a thresholder with short center wavelength has a better power function, and the slope in the middle level of the thresholder increases with increasing bandwidth. Through tuning the filter parameters, the thresholder can achieve a steplike power transfer function for optical thresholding, and a steplike power transmission function for optical self-switching. This makes the supercontinuum-based thresholder more flexible, and allows customization of performance to meet different demands in various applications.
{"title":"Effect of Filter Parameters on a Supercontinuum-Based All-Optical Tunable Thresholder","authors":"Huatao Zhu, Rong Wang, T. Pu, Tao Fang, P. Xiang, Huihui Zhu","doi":"10.3807/JOSK.2016.20.4.470","DOIUrl":"https://doi.org/10.3807/JOSK.2016.20.4.470","url":null,"abstract":"In this paper, the effects of filter parameters on a supercontinuum-based all-optical thresholder are experimentally investigated. By tuning the filter parameters, the power transfer function and power transmission function are tailored. The experimental results show that a thresholder with short center wavelength has a better power function, and the slope in the middle level of the thresholder increases with increasing bandwidth. Through tuning the filter parameters, the thresholder can achieve a steplike power transfer function for optical thresholding, and a steplike power transmission function for optical self-switching. This makes the supercontinuum-based thresholder more flexible, and allows customization of performance to meet different demands in various applications.","PeriodicalId":49986,"journal":{"name":"Journal of the Optical Society of Korea","volume":"20 1","pages":"470-475"},"PeriodicalIF":0.0,"publicationDate":"2016-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70140535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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