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Kin Seng Chiang - One of the best experts on this subject based on the ideXlab platform.

  • Polarization‐insensitive Polymer Waveguide Bragg gratings
    Microwave and Optical Technology Letters, 2020
    Co-Authors: Sin Yip Cheng, Kin Seng Chiang, Hau Ping Chan
    Abstract:

    We report the design and fabrication of Bragg gratings in benzocyclobutene (BCB) channel Waveguides with emphasis on the demonstration of their polarization dependence. The effects of the stress-induced birefringence in the Waveguide on the polarization dependence of the Bragg gratings are characterized and discussed. Our results show the possibility of realizing tunable polarization-insensitive Bragg-grating filters with simple Polymer Waveguide structures. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 334–338, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21342

  • Buried graphene electrode heater for a Polymer Waveguide thermo-optic device
    Optics Letters, 2019
    Co-Authors: Xibin Wang, Zeshan Chang, Kin Seng Chiang
    Abstract:

    We propose the use of graphene as the electrode heater material for a Polymer Waveguide thermo-optic (TO) device. Because a graphene electrode can be buried in a Polymer Waveguide without introducing a significant loss to the transverse magnetic polarized light, we can do away with the buffer layer that is required in a conventional TO device to isolate the metal electrode heater from the Waveguide and, hence, reduce the driving electric power of the device. To demonstrate the principle, we fabricate and compare two Polymer Waveguide TO mode switches based on the configuration of a balanced Mach–Zehnder interferometer, which are identical except that one uses a buried graphene electrode and the other uses an aluminum electrode deposited on the Waveguide surface. Our experimental device that uses a graphene electrode has a switching power almost four times lower and also responds faster. The use of buried graphene electrodes is an effective approach to reducing the power consumption of TO devices.

  • All-Optical Control of Propagation Loss with a Graphene-Embedded Polymer Waveguide
    2018 Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR), 2018
    Co-Authors: Zeshan Chang, Kin Seng Chiang
    Abstract:

    We demonstrate, theoretically and experimentally, all-optical control of propagation loss with a graphene-embedded Polymer Waveguide. Using a 10-mm long Waveguide, we achieve 4.6-dB loss modulation for 1550-nm light with 12.4-dBm co-propagating 980-nm pump light.

  • Four-mode-selective photonic lantern based on two-layer Polymer Waveguide branches
    2016 21st OptoElectronics and Communications Conference (OECC) held jointly with 2016 International Conference on Photonics in Switching (PS), 2016
    Co-Authors: Yunfei Wu, Kin Seng Chiang
    Abstract:

    We design and fabricate a four-core photonic lantern with two-layer asymmetric Polymer Waveguide branches to spatially (de)multiplex the LP01, LP11a, LP11b, and LP21a modes. The device operates over the C+L band with negligible polarization dependence.

  • Mode (De)multiplexer Based on Polymer-Waveguide Asymmetric Y-Junction
    2016 Asia Communications and Photonics Conference (ACP), 2016
    Co-Authors: Jing Feng, Kaixin Chen, Jie Yun Wu, Kin Seng Chiang
    Abstract:

    We design a Polymer-Waveguide asymmetric Y-junction for (de)multiplexing LP01 and LP11a modes. Our fabricated device shows the optimal demultiplexed crosstalk of -22.2 dB at 1560 nm and the 10-dB bandwidth of ~40 nm.

Sangyung Shin - One of the best experts on this subject based on the ideXlab platform.

  • characteristics of Polymer Waveguide notch filters using thermooptic long period gratings
    IEEE Journal of Selected Topics in Quantum Electronics, 2005
    Co-Authors: Minsuk Kwon, Sangyung Shin
    Abstract:

    We demonstrate experimentally the feasibility of a Polymer Waveguide notch filter using a thermooptic long-period grating. This notch filter consists of a channel Waveguide, a cladding surrounding the channel, and buffer layers sandwiching the cladding. Periodic heaters formed on the upper buffer layer induce a long-period grating thermooptically. Thus, they generate temporarily a resonance band of notch type in the transmission spectrum of the filter. Using thermocurable Polymers, we have fabricated notch filters 1 and 2 that have different cladding thicknesses. Experimental results demonstrate two features of the notch filters. One feature is dynamical controllability of the attenuation of a resonance band. For TE mode, the maximum attenuation of notch filters 1 and 2 increases from 0 to 27 dB as the power applied to notch filters 1 and 2 increases from 0 to 851 and 1170 mW, respectively. The other feature is controllability of the direction and magnitude of the center wavelength shift occurring when the attenuation is tuned. The shift property depends on the cladding thickness. The measured characteristics of notch filters 1 and 2 are qualitatively in good agreement with our theoretical analysis. Using this feature, we may implement the notch filter whose attenuation is adjustable without center wavelength shift. This Polymer Waveguide notch filter may be used to implement a compact filter whose spectrum is dynamically tailored.

  • Polymer Waveguide notch filter using two stacked thermooptic long-period gratings
    IEEE Photonics Technology Letters, 2005
    Co-Authors: Minsuk Kwon, Sangyung Shin
    Abstract:

    A Polymer Waveguide notch filter using two stacked thermooptic long-period gratings is proposed. It is a long-period Waveguide grating whose transmission spectrum can be dynamically controlled. Thermooptic index perturbation, i.e., grating is temporarily induced by two groups of periodic heaters stacked vertically on the filter surface. The periods of the two groups are determined such that two different resonance bands are generated in the spectrum by the respective groups. Thus, the overall spectrum may be actively shaped by controlling the individual power applied to the two groups. Its feasibility is demonstrated experimentally by fabricating it with thermocurable Polymers.

  • Tunable Polymer Waveguide notch filter using a thermooptic long-period grating
    IEEE Photonics Technology Letters, 2005
    Co-Authors: Minsuk Kwon, Sangyung Shin
    Abstract:

    The feasibility of a Polymer Waveguide notch filter using a thermooptic long-period grating is demonstrated experimentally. It consists of a channel Waveguide, a cladding surrounding the channel, and buffer layers sandwiching the cladding. Periodic heaters, placed on the filter surface, induce thermooptically a long-period grating. The attenuation of the filter is controlled by adjusting the power applied to the periodic heaters. The filter is made of thermocurable Polymers by using conventional processes. For transverse-electric mode, its attenuation increases from 0 to 27 dB as the power applied to the periodic heaters increases from 0 to 851 mW. For the maximum attenuation spectrum, the 3-dB bandwidth of the attenuation band is 16 nm.

  • TE-TM mode converter in a poled-Polymer Waveguide
    IEEE Journal of Quantum Electronics, 1996
    Co-Authors: Wol-yon Hwang, Min-cheol Oh, Taehyoung Zyung, Sangyung Shin
    Abstract:

    A novel active TE-TM mode converter in a poled electrooptic Polymer Waveguide is demonstrated. The mode converter utilizes a 45/spl deg/-off poling configuration, which can be obtained by arranging upper- and lower-stripe poling electrodes with a proper lateral displacement. The mode-conversion properties and electrooptic effect are demonstrated by using a vector-beam propagation method in a buried channel-type Waveguide. Applications to integrated Polymer-Waveguide devices are also suggested.

  • Explicit vector beam propagation method for uniaxial poled Polymer Waveguide devices
    Proceedings of LEOS'94, 1994
    Co-Authors: Min-cheol Oh, Sangyung Shin, Wol-yon Hwang
    Abstract:

    For the design and the analysis of integrated optic devices, the beam propagation method (BPM) has been widely used. A vectorial BPM (VBPM) was also developed to simulate the polarization effects and to analyze Waveguide structures having large index discontinuities. Recently, the VBPM was extended to treat anisotropic medium by taking the tensorial character of the dielectric constant /spl epsiv/ into account. However, this method using implicit numerical analysis is very complex and needs long computing time. To handle three-dimensional uniaxial Waveguide devices that consist especially of a poled electro-optic (EO) Polymer Waveguide, we developed a new VBPM based on an explicit finite difference (EFD) algorithm. This method is straightforward and easy to program. A novel polarization converter that may be implemented by appropriate poling of the EO Polymer Waveguide is also proposed and analyzed.

Hau Ping Chan - One of the best experts on this subject based on the ideXlab platform.

  • Polarization‐insensitive Polymer Waveguide Bragg gratings
    Microwave and Optical Technology Letters, 2020
    Co-Authors: Sin Yip Cheng, Kin Seng Chiang, Hau Ping Chan
    Abstract:

    We report the design and fabrication of Bragg gratings in benzocyclobutene (BCB) channel Waveguides with emphasis on the demonstration of their polarization dependence. The effects of the stress-induced birefringence in the Waveguide on the polarization dependence of the Bragg gratings are characterized and discussed. Our results show the possibility of realizing tunable polarization-insensitive Bragg-grating filters with simple Polymer Waveguide structures. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 334–338, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21342

  • Bottom-Heating Approach for the Realization of Thermooptic Polymer Waveguide Devices
    IEEE Photonics Technology Letters, 2011
    Co-Authors: Kin Seng Chiang, Hau Ping Chan
    Abstract:

    We propose a bottom-heating approach to realizing a thermo-optically tunable Polymer Waveguide device, where the electrode heater is deposited at the bottom of the Waveguide through a hole-etched substrate. Compared with the conventional top-heating approach, the bottom-heating approach can provide more effective optical isolation from the electrode, reduce the risk of damaging the Polymer material in the fabrication process, and simplify electric wiring. We demonstrate the idea experimentally with an ultraviolet written long-period grating on a Polymer Waveguide fabricated by an imprinting technique, which incorporates a bottom electrode heater for phase-shift tuning. The grating requires an electric power of 1.74 mW to produce a -phase shift.

  • Broadband Multiport Dynamic Optical Power Distributor Based on Thermooptic Polymer Waveguide Vertical Couplers
    IEEE Photonics Technology Letters, 2008
    Co-Authors: Kaixin Chen, Kin Seng Chiang, Hau Ping Chan
    Abstract:

    We propose a broadband multiport dynamic optical power distributor, which consists of a series of asymmetric vertical optical Waveguide directional couplers with thermooptically tunable splitting ratios. To demonstrate the idea experimentally, we fabricated a five-port optical power distributor with four Polymer Waveguide vertical couplers. The fabricated device is 9 mm long and allows a practically arbitrary optical power distribution to be achieved with a maximum electric power consumption less than 50 mW in any of the couplers and a response time of ~1 ms. The device operates effectively in the whole C-band without significant variations in performance.

  • Polymer-Waveguide-based vertical coupler
    Optics Communications, 2006
    Co-Authors: Z.j. Cheng, Hau Ping Chan, Z.l. Peng, K.x. Chen, Chongxiu Yu
    Abstract:

    Abstract A 2 × 2 Polymer-Waveguide-based vertical coupler was designed and fabricated. The relationships between the coupling efficiency and the key optical design parameters of vertical coupler (such as the crossing angle, gap thickness between two Waveguide layers and the Waveguide dimensions) were investigated by using beam propagation method. Based on these simulations, a fully Polymer vertical coupler was demonstrated.

  • Polarization dependence in Polymer Waveguide directional couplers
    IEEE Photonics Technology Letters, 2005
    Co-Authors: Sin Yip Cheng, Kin Seng Chiang, Hau Ping Chan
    Abstract:

    We designed and fabricated benzocyclobutene-based Polymer Waveguide directional couplers and measured the polarization dependence of their splitting ratios. Wide-band polarization-insensitive operation and the possibility of using thermal tuning to maintain low polarization dependence were demonstrated.

Min-cheol Oh - One of the best experts on this subject based on the ideXlab platform.

Kaixin Chen - One of the best experts on this subject based on the ideXlab platform.