| 摘要(英) |
Wavelength-division multiplexer (WDM) is one of the most important technologies in the lightwave network systems, such as Fiber-to-the-home (FTTH) application [2-5]. Thin film filter (TFF) has been widely used in the passive optical network (PON) architecture, and its optical sub-assembly (OSA) is generally adopted as the TO-CAN [2-3] and planar lightwave circuits (PLC) type [4-5]. TFF based on TO-CAN OSA is the con-ventional type. However, it suffers from hard packaging tasks, whose alignment tolerance between LD, TFF, SMF, or ball lens should be achieved micro-scaled precision within such macro-sized device [2-3]. PLC-typed OSA can be further miniaturized and straightly become a platform of assembling drive IC, opto-electronic devices [4-5]. Suntae Jung et al. have developed hybrid integration technology via inserting a TFF in the trench with an adhesive . However, for reducing coupling efficiency between waveguide facets, the width of trench is only 20 μm. It is still a big task to insert such tiny film within this small trench.
In this paper, a monolithic integrated-WDM via sub-wavelength si grating filter, which is replaced the hybrid-integrated TFF, is proposed on SOI-based PLCs. As shown in Fig. 1-7, this Si-grating filter structure can be monolithically fabricated on the integrated PLC, and the separated length between waveguide facets can also be narrowed to sub-wavelength scaled by e-beam lithography process, which maintains the waveguide coupling efficiency.
In design consideration, this sub-wavelength si grating is formed as a guided-mode resonance (GMR) filter [16]. As satisfying the phase-matched condition, lightwave of the resonant wavelength would be extremely reflective, and the others would be trans-mitted. This sub-wavelength Si grating is very different from conventional free-space GMR filter because the incident lightwave emitted from rib waveguide is of finite-size and Gaussian-like profile, which is away from the free-space condition [16]. Fortunately,not only the sub-wavelength-scaled distance between waveguide facets maintains a finite-sized, however, planar wave-front of the waveguide field, but also the large dielectric constants of silicon, both of which make the resonant mode indeed locally exist in this si grating.
In this work, the 1310/1550 nm WDM filter via this monolithically integrated device is demonstrated numerically and experimentally. The stop- and pass-band of 1310 and 1550 nm, respectively, are broad of 60 and 40 nm within 0.5 dB variations. The fabrication process is also dis-cussed. |
| 參考文獻 |
[1]S.E. Miller, “Integrated optics: an introduction,”Bell System Technol. J., 48, 2059 (1969)
[2]M. Tamura, Taya-cho, Sakae-ku, and Yokohama, “Low Cost passive and active devices for FTTH systems, ” Proc. SPIE., Vol. 6014 , 60140K-1 (2005)
[3]H. J. Yoon, H. W. Cho, Y. U. Cho, and K. D. Kim, “Bi-directional small form pluggable optical transceiver using an integrated WDM optical subassembly,” Proc. SPIE., Vol. 6352, 63521O-1 (2006)
[4]H. Imam, J. P. Rasmussen, and M. Pearson, “Integrated bi-directional transceivers for Access applications based on a cost-effective PLC hybridized platform,” Proc. SPIE, Vol. 6124, 612412 (2006)
[5]T. Hashimoto, T. Kurosaki, M. Yanagisawa, Y. Suzuki, Y. Akahori, Y. Inoue,Y. Tohmori, K.Kato, Y. Yamada, N. Ishihara, and K. Kato, “A 1.3/1.55-μm Wavelength-Division Multiplexing Optical ModuleUsing a Planar Lightwave Circuit for Full Duplex Operation,” J. Lightwave Technol, VOL. 18, NO.11, 1541-1547(2000)
[6]K.Y. Kim, J.H. Song, S.Y. Kim, “Planar lightwave circuit having optical filter,” US Patent: 7,324,727
[7]T. E. Murphy, J. T. Hastings, and H. I. Smith, “Fabrication and Characterization of Narrow-Band Bragg-Reflection Filters in Silicon-on-Insulator Ridge Waveguides,” J. Lightwave Technol, VOL. 19, NO.12, 1938-1942 ( 2001)
[8]
M. LoCascio, C.T. Ballinger, D.P. Landry, “Planar lightwave Fabry-Perot filter.” US Patent: 7,200,302
[9]A. Balakrishnan, S. Bidnyk, M. Pearson, “Two-stage optical by-directional transceiver,” US Patent: 7,209,612
[10]R.W. Wood, “On a remarkable case of uneven distribution of light in a diffraction grating spectrum,” Philos. Mag. 4, 396 (1902)
[11]A. Hessel ,and A. A. Oliner, “A new theory of Wood’s anomalies on optical grating,” Appl. Opt. 10, 1275 (1965)
[12]R. Magnusson and S. S. Wang,“New principle for optical filters,” Appl. Phys. Lett., vol. 61, pp.1022-1024 (1992)
[13]S. S. Wang and R. Magnusson, “Theory and applications of guided-mode resonance filters,”Appl. Opt., vol. 32, no. 14, pp.2606-2613 (1993)
[14]D. L. Brundrett, E. N. Flytsis, T. K. Gaylord, and J. M. Bendickson, “Effects of modulation strength in fuided-mode resonant subwavelength fratings at normal incidence,” J. Opt. Soc. Am. A, Vol 17. 7, 1221 (1997)
[15]D. W. Peters, S. A. Kemme, and G.R. Hadley, “Effect of finite grating, waveguide width, and end-facet feometry on resonant subwavelength grating reflectivity,” J. Opt. Soc. Am. A, Vol 21. 6, 981(2004)
[16]
C. L. Hsu, M. L. Wu, Y. C. Liu, Y. C. Lee, and J. Y. C hang, “Flattened Broadband Notch Filters Using Guided-Mode Resonance Associated With Asymmetric Binary Gratings,” IEEE Photon. Technol. Lett., VOL. 18, NO.24, 2572 (2006)
[17]
S. S. Wang, R. Magnusson, J. S. Bagby, and M. G. Moharam, “Guided-mode resonances in planar dielectric-layerdiffraction gratings,” J. Opt. Soc. Am. A, vol. 18, 1470 (1990)
[18]
R. R. Boye, and R. K. Kostuk, “Investigation of the effect if finite grating size on the performance of guided-mode resonance filters,” Appl. Opt. 39, 3649 (2000)
[19]S. P. Pogossian, L. Vescan, and A. Vonsovici, “The Single-mode condition for semiconductor rib wavegude with large cross section,” J. Lightwave Technol, VOL. 16, NO.10, 1851 ( 1998)
[20]
A. Tavlove, “The finite-difference time-domain method, ” Computational Electrodynamics (1995)
[21]C.M. Wang, J.Y. Chang, C.L. Hsu, C.C. Lee and J.C. Yang, “Si-based guided-mode resonance filter on a micro-optical bench,” IEEE ELECTRONICS LETT., Vol. 40 ,No. 21, (2004) |
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