Dr. Ziyang Zhang Profile

Dr. Ziyang Zhang

at Leibniz-Institut für Astrophysik Potsdam

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Author

Publications (13)

Proceedings Article | 10 July 2018 Presentation

FBG development for OH suppression at innoFSPEC Potsdam (Conference Presentation)

Martin Roth, Ziyang Zhang, Kalaga Madhav, Julia Fiebrandt

Proceedings Volume 10706, 1070605 (2018) https://doi.org/10.1117/12.2311787

KEYWORDS: Fiber Bragg gratings, Near infrared, Diffraction, Optical alignment, Control systems, Modulation, Algorithm development, Process control, Space telescopes, Telescopes

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The power of the next generation of telescopes that will rely largely on the combination of light-collecting area with excellent (ideally: diffraction limited) image quality. Therefore, the focus will heavily lean on adaptive optics and the near infrared wavelength regime. A severe limiting factor is the presence and strength of atmospheric OH emission lines in the NIR. OH suppression techniques involving fiber Bragg gratings (FBG) have been proposed, however as yet not fully demonstrated on sky. We are involved in the first generation FBG prototype development with partners in Australia, including the GNOSIS and PRAXIS on-sky experiments. Since the supply of suitable multi-notch filters is no longer available from industry, we have made an effort at innoFSPEC Potsdam to build a specialized laboratory for the development and manufacture of 2nd generation FBGs for OH suppression. Suppression of the strong NIR OH emission lines requires a single grating that reflects multiple wavelengths, spaced at non-periodic intervals, with flat-top profile and high suppression ratio. It has been shown that aperiodic fiber Bragg gratings (AFBGs) can provide such functions. However, the fabrication technology requires accurate optical alignment of several degrees of freedom as well as complex control of modulated beams to form a varying interference pattern. In our work, an algorithm is developed from the index profile of a multi-notch AFBG to the design of a complex phase-mask that can generate a matching UV diffraction pattern, which will in turn inscribe an single-mode fiber into the chosen AFBG. With such a phase mask, the fabrication of the AFBGs will be reduced to a simple UV-exposure process, i.e., the complex alignment and control processes of the interference pattern from modulated beams are avoided altogether. The resulting reliable and reproducible fabrication process will dramatically reduce of the cost of such filters. Packaging aspects for a complete sky emission filter system will also be discussed.

Proceedings Article | 10 July 2018 Paper

High-performance integrated photonic spectrometers based on arrayed waveguide gratings in silica

Ziyang Zhang, Andreas Stoll, Kalaga Madhav, Julia Fiebrandt, Vadim Makan, Kirill Makan, Kai Sun, Dele Zhu, Martin Roth

Proceedings Volume 10706, 107063C (2018) https://doi.org/10.1117/12.2311856

KEYWORDS: Waveguides, Spectrometers, Astronomy, Silica, Integrated photonics, Spectral resolution, Spectrographs, Polarization, Wave propagation, Wavefronts

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Proceedings Article | 20 October 2016 Paper

High performance gratings for DFB lasers fabricated by direct-write e-beam lithography

R. Steingrüber, Z. Zhang

Proceedings Volume 10032, 100320C (2016) https://doi.org/10.1117/12.2248862

KEYWORDS: Electron beam lithography, Laser applications, Semiconductor lasers, Scanning electron microscopy, Lithography, Polymethylmethacrylate, Telecommunications, Laser development, Optical design, Mirrors

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Proceedings Article | 1 May 2015 Paper

Passive and electro-optic polymer photonics and InP electronics integration

Z. Zhang, V. Katopodis, P. Groumas, A. Konczykowska, J. Dupuy, A. Beretta, A. Dede, E. Miller, J. Choi, P. Harati, F. Jorge, V. Nodjiadjim, R. Dinu, G. Cangini, A. Vannucci, D. Felipe, A. Maese-Novo, N. Keil, H. Bach, Martin Schell, H. Avramopoulos, Ch. Kouloumentas

Proceedings Volume 9516, 951603 (2015) https://doi.org/10.1117/12.2179221

KEYWORDS: Polymers, Modulators, Electronics, Waveguides, Transmitters, Modulation, Eye, Neodymium, Control systems, Ceramics

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Proceedings Article | 27 February 2015 Paper

Recent progress in InP/polymer-based devices for telecom and data center applications

Moritz Kleinert, Ziyang Zhang, David de Felipe, Crispin Zawadzki, Alejandro Maese Novo, Walter Brinker, Martin Möhrle, Norbert Keil

Proceedings Volume 9365, 93650R (2015) https://doi.org/10.1117/12.2077209

KEYWORDS: Waveguides, Polymers, Polymer multimode waveguides, Mirrors, Optical fibers, Dielectric polarization, Polarization, Integrated optics, Single mode fibers, Signal attenuation

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Proceedings Article | 22 May 2013 Paper

Low-loss silicon nitrite waveguides in polymer

Ziyang Zhang, Dongliang Liu, Norbert Keil, Norbert Grote

Proceedings Volume 8767, 87670U (2013) https://doi.org/10.1117/12.2017485

KEYWORDS: Waveguides, Polymers, Polymer multimode waveguides, Cladding, Silicon, Fiber Bragg gratings, Optical filters, Optical lithography, Single mode fibers, Dielectric polarization

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Proceedings Article | 7 May 2013 Paper

Thermo-optic simulations of silicon nitride / polymer hybrid waveguides

Anjin Liu, Ziyang Zhang, Dongliang Liu, Norbert Keil, Norbert Grote

Proceedings Volume 8781, 878105 (2013) https://doi.org/10.1117/12.2017466

KEYWORDS: Waveguides, Polymers, Thermal optics, Silicon, Polymer multimode waveguides, Refractive index, Birefringence, Thermography, Optical simulations, Finite element methods

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Proceedings Article | 28 November 2011 Paper

Quantifying direct DQPSK receiver with integrated photodiode array by assessing an adapted common-mode rejection ratio

J. Wang, M. Lauermann, C. Zawadzki, W. Brinker, Z. Zhang, D. de Felipe, N. Keil, N. Grote, M. Schell

Proceedings Volume 8308, 83080R (2011) https://doi.org/10.1117/12.904384

KEYWORDS: Receivers, Polymers, Palladium, Waveguides, Photodiodes, Hybrid optics, Photonic integrated circuits, Mirrors, Polymer multimode waveguides, Phase shift keying

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Proceedings Article | 2 December 2009 Paper

Signal processing in silicon waveguides

Yikai Su, Fangfei Liu, Qiang Li, Qingjiang Chang, Ziyang Zhang, Min Qiu

Proceedings Volume 7630, 763014 (2009) https://doi.org/10.1117/12.853348

KEYWORDS: Silicon, Resonators, Microrings, Frequency shift keying, Phase shifts, Waveguides, Signal processing, Picosecond phenomena, Modulation, Data conversion

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Proceedings Article | 18 November 2008 Paper

Ultra-compact mode-split silicon microring resonator for format conversion from NRZ to FSK

Fangfei Liu, Qiang Li, Ziyang Zhang, Min Qiu, Yikai Su

Proceedings Volume 7135, 713537 (2008) https://doi.org/10.1117/12.802850

KEYWORDS: Frequency shift keying, Microrings, Resonators, Silicon, Data conversion, Modulation, Scanning electron microscopy, Waveguides, Optical amplifiers, Dispersion

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Proceedings Article | 18 November 2008 Paper

Concentric silicon micro-ring resonators with enhanced transmission notch depth

Xiaohui Li, Ziyang Zhang, Qiang Li, Min Qiu, Yikai Su

Proceedings Volume 7135, 71350Q (2008) https://doi.org/10.1117/12.804230

KEYWORDS: Resonators, Waveguides, Silicon, Microrings, Optical filters, Finite-difference time-domain method, Biosensing, Solids, Optical design, Biosensors

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Proceedings Article | 19 November 2007 Paper

System performance of slow-light buffering and storage in silicon nano-waveguide

Yikai Su, Fangfei Liu, Qiang Li, Ziyang Zhang, Min Qiu

Proceedings Volume 6783, 67832P (2007) https://doi.org/10.1117/12.743020

KEYWORDS: Resonators, Microrings, Silicon, Waveguides, Thermal effects, Slow light, Scanning electron microscopy, Gold, Optical amplifiers, Computing systems

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Proceedings Article | 13 April 2005 Paper

High-Q microcavities in 2D photonic crystal slabs studied by FDTD techniques and Padé approximation

Min Qiu, Ziyang Zhang

Proceedings Volume 5733, (2005) https://doi.org/10.1117/12.589579

KEYWORDS: Photonic crystals, Finite-difference time-domain method, Optical microcavities, Silicon, Silica, Etching, Refractive index, Fourier transforms, Laser applications, Optical filters

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Showing 5 of 13 publications

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