The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Leo J. Missaggia - One of the best experts on this subject based on the ideXlab platform.

  • Single-mode Optical Fiber Coupling of high-power tapered gain region devices
    IEEE Photonics Technology Letters, 1994
    Co-Authors: Jeffrey C Livas, E.s. Kintzer, J.n. Walpole, C.a. Wang, S.r. Chinn, Leo J. Missaggia
    Abstract:

    A simple method for collimating the Optical output of a tapered gain region amplifier or laser and Coupling to a single-mode Optical Fiber is described, along with a technique for quantitatively assessing the expected Coupling efficiency. By using a tapered laser, 840 mW at 980 mm was coupled into single-mode Fiber with 44% efficiency measured from Fiber input to available internal Fiber power, in excellent agreement with the 48% predicted. When transmission losses of the collimating optics are included, the power Coupling efficiency referred to the laser facet power is 32%.

Cheng-tang Pan - One of the best experts on this subject based on the ideXlab platform.

  • Fabrication of an eyeball-like spherical micro-lens array using extrusion for Optical Fiber Coupling
    Journal of Micromechanics and Microengineering, 2009
    Co-Authors: Sheng-chih Shen, Cheng-tang Pan, C. H. Chao, K. H. Liu, J.c. Huang
    Abstract:

    Batch fabrication of an eyeball-like spherical micro-lens array (ESMA) not only can reduce micro assembly cost, but also can replace conventional ball lenses or costly gradient refractive index without sacrificing performance. Compared to the conventional half-spherical micro-lenses, the ESMA is an eyeball-like spherical lens which can focus light in all directions, thus providing application flexibility for Optical purposes. The current ESMA is made of photoresist SU-8 using the extrusion process instead of the traditional thermal reflow process. For the process of an ESMA, this research develops a new process at ambient temperature by spin-coating SU-8 on a surface of a silicon wafer which serves as an extrusion plate and extruding it through a nozzle to form an ESMA. This nozzle consists of a nozzle orifice and nozzle cavity. The nozzle orifice is defined and made of SU-8 photoresist using ultra-violet lithography, which exhibits good mechanical property. The fabrication process of a nozzle cavity employs bulk micromachining to fabricate the cavities. Next, viscous SU-8 spun on the extrusion plate is extruded through the nozzle orifice to form an ESMA. Based on the effect of surface tension, by varying the amount of SU-8 on the plate extruded through different nozzle orifices, various diameters of ESMA can be fabricated. In this paper, a 4 × 4 ESMA with a numerical aperture of about 0.38 and diameters ranging from 60 to 550 µm is fabricated. Optical measurements indicate a diameter variance within 3% and the maximum Coupling efficiency is approximately 62% when the single mode Fiber is placed at a distance of 10 µm from the ESMA. The research has proved that the extrusion fabrication process of an ESMA is capable of enhancing the Coupling efficiency.

  • Fabrication of eyeball-like spherical micro-lens array for Optical Fiber Coupling
    Volume 3: ASME IEEE 2009 International Conference on Mechatronic and Embedded Systems and Applications; 20th Reliability Stress Analysis and Failure P, 2009
    Co-Authors: S. C. Shen, Cheng-tang Pan, Ruey Fang Shyu, C. H. Chao, J.c. Huang, C. Y. Yeh
    Abstract:

    Batch-fabrication of eyeball-like spherical micro-lens not only reduces micro assembly cost, but also replaces conventional ball-lenses or costly GRINs (Gradient Reflective Index) without sacrificing performance. Compared to the conventional micro-lenses made in a half-spherical geometry, the eyeball-like micro-lens is a sphere, which allows focusing light in all directions on the substrate surface, thus providing application flexibility for Optical applications. The current eyeball-like spherical micro-lens is made using photoresist SU-8. This work develops a batch process at low temperature by spin-coating SU-8 on a surface of silicon wafer. The SU-8 thick film is patterned by UV lithography to form an array of holes for holding eyeball-like spherical micro-lens. The fabrication process employs bulk micromachining to fabricate an array of nozzles on the silicon wafer. Next, this process pours viscous SU-8 into the cavity of silicon wafer and presses it through the nozzle before reflow. The eyeball-like spherical micro-balls form by balancing between surface tension and cohesion. Varying the amount of SU-8 pressed through the nozzle controls the diameter of the balls. This paper designs a pattern with a 3 × 3 lens-array with a numerical aperture of about 0.38. Diameters range from 60 to 500 um. Optical measurements indicate a diameter fluctuation within 3% and an Optical insertion loss is below 2.5dB with a wavelength of 635nm in a single-mode Fiber (SMF). Therefore the eyeball-like spherical micro-lens is capable of increasing Coupling efficiency.Copyright © 2009 by ASME

  • Batch Assembly Micro-Ball Lens Array for Si-Based Optical Coupling Platform in Free Space
    Optical Review, 2001
    Co-Authors: Sheng-chih Shen, Cheng-tang Pan, Hwai-pwu Chou, Min-chieh Chou
    Abstract:

    The paper presents novel concepts of batch fabrication of micro-ball lens array technology integrated on the silicon-based wafer which can improve the appropriate distance for Optical Fiber Coupling. The silicon-based Optical Coupling platform consists of a self-parking framework (including flat-topped mesa and intersection of two v-grooves) and micro-ball lens array for Optical Fiber Coupling purposes. The structure of Optical Coupling platform is able to improve the distance between Fiber and micro-ball lens and to increase Coupling efficiency. Optical measurement reveals an insertion loss below 2.5 dB with wavelength 635 nm in singlemode Fiber. The micro-ball lens array is batch fabricated by polymeric material and thick photoresist, and then bonded onto a flat-topped mesa that adjoins to the v-groove. The corner compensation offers a method to fabricate the flat-topped mesa in the intersection of two v-grooves. This fabrication process not only provides accurate Coupling distance between Fibers and micro-ball lens, but also reduces micro-assembly cost.

  • Batch assembly microball lens array for Si-based Optical Coupling platform in free space
    Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), 2001
    Co-Authors: Sheng-chih Shen, Cheng-tang Pan, Hwai-pwu Chou, Yu Hsi Chao, Kun Lung Lin, Yang Jauh Jung
    Abstract:

    The paper presents novel concepts of batch fabrication of micro-ball lens array technology integrated on the silicon based wafer by low temperature wafer bonding by which can improve appropriate distance of Optical Fiber Coupling. The silicon based Coupling platform consists of the self-parking framework, micro-ball lens array, and precision platform for Optical Fiber Coupling purpose. The structure of Optical platform is able to improve distance of between Fiber and micro-ball lens and increase Coupling efficiency. The micro- ball lens array is batch fabricated by polymeric material and melting photoresist through low temperature wafer bonding. Then batch assembly onto each other flat-topped mesa that adjoins to the v-groove. The corner compensation offers a method to fabricate self-parking framework and flat-topped mesa in the intersection of two v-grooves. This fabrication process not only provides accurate Coupling distance between Fibers and micro-ball lens but also reduces micro-assembly cost.

Sheng-chih Shen - One of the best experts on this subject based on the ideXlab platform.

  • Fabrication of an eyeball-like spherical micro-lens array using extrusion for Optical Fiber Coupling
    Journal of Micromechanics and Microengineering, 2009
    Co-Authors: Sheng-chih Shen, Cheng-tang Pan, C. H. Chao, K. H. Liu, J.c. Huang
    Abstract:

    Batch fabrication of an eyeball-like spherical micro-lens array (ESMA) not only can reduce micro assembly cost, but also can replace conventional ball lenses or costly gradient refractive index without sacrificing performance. Compared to the conventional half-spherical micro-lenses, the ESMA is an eyeball-like spherical lens which can focus light in all directions, thus providing application flexibility for Optical purposes. The current ESMA is made of photoresist SU-8 using the extrusion process instead of the traditional thermal reflow process. For the process of an ESMA, this research develops a new process at ambient temperature by spin-coating SU-8 on a surface of a silicon wafer which serves as an extrusion plate and extruding it through a nozzle to form an ESMA. This nozzle consists of a nozzle orifice and nozzle cavity. The nozzle orifice is defined and made of SU-8 photoresist using ultra-violet lithography, which exhibits good mechanical property. The fabrication process of a nozzle cavity employs bulk micromachining to fabricate the cavities. Next, viscous SU-8 spun on the extrusion plate is extruded through the nozzle orifice to form an ESMA. Based on the effect of surface tension, by varying the amount of SU-8 on the plate extruded through different nozzle orifices, various diameters of ESMA can be fabricated. In this paper, a 4 × 4 ESMA with a numerical aperture of about 0.38 and diameters ranging from 60 to 550 µm is fabricated. Optical measurements indicate a diameter variance within 3% and the maximum Coupling efficiency is approximately 62% when the single mode Fiber is placed at a distance of 10 µm from the ESMA. The research has proved that the extrusion fabrication process of an ESMA is capable of enhancing the Coupling efficiency.

  • Batch Assembly Micro-Ball Lens Array for Si-Based Optical Coupling Platform in Free Space
    Optical Review, 2001
    Co-Authors: Sheng-chih Shen, Cheng-tang Pan, Hwai-pwu Chou, Min-chieh Chou
    Abstract:

    The paper presents novel concepts of batch fabrication of micro-ball lens array technology integrated on the silicon-based wafer which can improve the appropriate distance for Optical Fiber Coupling. The silicon-based Optical Coupling platform consists of a self-parking framework (including flat-topped mesa and intersection of two v-grooves) and micro-ball lens array for Optical Fiber Coupling purposes. The structure of Optical Coupling platform is able to improve the distance between Fiber and micro-ball lens and to increase Coupling efficiency. Optical measurement reveals an insertion loss below 2.5 dB with wavelength 635 nm in singlemode Fiber. The micro-ball lens array is batch fabricated by polymeric material and thick photoresist, and then bonded onto a flat-topped mesa that adjoins to the v-groove. The corner compensation offers a method to fabricate the flat-topped mesa in the intersection of two v-grooves. This fabrication process not only provides accurate Coupling distance between Fibers and micro-ball lens, but also reduces micro-assembly cost.

  • Batch assembly microball lens array for Si-based Optical Coupling platform in free space
    Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), 2001
    Co-Authors: Sheng-chih Shen, Cheng-tang Pan, Hwai-pwu Chou, Yu Hsi Chao, Kun Lung Lin, Yang Jauh Jung
    Abstract:

    The paper presents novel concepts of batch fabrication of micro-ball lens array technology integrated on the silicon based wafer by low temperature wafer bonding by which can improve appropriate distance of Optical Fiber Coupling. The silicon based Coupling platform consists of the self-parking framework, micro-ball lens array, and precision platform for Optical Fiber Coupling purpose. The structure of Optical platform is able to improve distance of between Fiber and micro-ball lens and increase Coupling efficiency. The micro- ball lens array is batch fabricated by polymeric material and melting photoresist through low temperature wafer bonding. Then batch assembly onto each other flat-topped mesa that adjoins to the v-groove. The corner compensation offers a method to fabricate self-parking framework and flat-topped mesa in the intersection of two v-grooves. This fabrication process not only provides accurate Coupling distance between Fibers and micro-ball lens but also reduces micro-assembly cost.

Jeffrey C Livas - One of the best experts on this subject based on the ideXlab platform.

  • Single-mode Optical Fiber Coupling of high-power tapered gain region devices
    IEEE Photonics Technology Letters, 1994
    Co-Authors: Jeffrey C Livas, E.s. Kintzer, J.n. Walpole, C.a. Wang, S.r. Chinn, Leo J. Missaggia
    Abstract:

    A simple method for collimating the Optical output of a tapered gain region amplifier or laser and Coupling to a single-mode Optical Fiber is described, along with a technique for quantitatively assessing the expected Coupling efficiency. By using a tapered laser, 840 mW at 980 mm was coupled into single-mode Fiber with 44% efficiency measured from Fiber input to available internal Fiber power, in excellent agreement with the 48% predicted. When transmission losses of the collimating optics are included, the power Coupling efficiency referred to the laser facet power is 32%.

Tolga Tekin - One of the best experts on this subject based on the ideXlab platform.

  • silicon photonic circuits on cmos integration Fiber Optical Coupling and packaging
    IEEE Journal of Selected Topics in Quantum Electronics, 2011
    Co-Authors: Christophe Kopp, Stephane Bernabe, Badhise Ben Bakir, Jm Fedeli, Regis Orobtchouk, Franz Schrank, Henri Porte, Lars Zimmermann, Tolga Tekin
    Abstract:

    Silicon photonics is a new technology that should at least enable electronics and optics to be integrated on the same optoelectronic circuit chip, leading to the production of low-cost devices on silicon wafers by using standard processes from the microelectronics industry. In order to achieve real-low-cost devices, some challenges need to be taken up concerning the integration technological process of optics with electronics and the packaging of the chip. In this paper, we review recent progress in the packaging of silicon photonic circuits from on-CMOS wafer-level integration to the single-chip package and input/output interconnects. We focus on Optical Fiber-Coupling structures comparing edge and surface couplers. In the following, we detail Optical alignment tolerances for both Coupling architecture, discussing advantages and drawbacks from the packaging process point of view. Finally, we describe some achievements involving advanced-packaging techniques.