L H Zhang, S Q Sun, M Li, N H Zhu. All-optical temporal fractional order differentiator using an in-fiber ellipsoidal air-microcavity[J]. J. Semicond., 2017, 38(12): 126001. doi: 10.1088/1674-4926/38/12/126001.
Abstract: An all-optical temporal fractional order differentiator with ultrabroad bandwidth (~1.6 THz) and extremely simple fabrication is proposed and experimentally demonstrated based on an in-fiber ellipsoidal air-microcavity. The ellipsoidal air-microcavity is fabricated by splicing a single mode fiber (SMF) and a photonic crystal fiber (PCF) together using a simple arc-discharging technology. By changing the arc-discharging times, the propagation loss can be adjusted and then the differentiation order is tuned. A nearly Gaussian-like optical pulse with 3 dB bandwidth of 8 nm is launched into the differentiator and a 0.65 order differentiation of the input pulse is achieved with a processing error of 2.55%.
Key words: optical signal processing, optical differentiator, in-fiber ellipsoidal air-microcavity
Abstract: An all-optical temporal fractional order differentiator with ultrabroad bandwidth (~1.6 THz) and extremely simple fabrication is proposed and experimentally demonstrated based on an in-fiber ellipsoidal air-microcavity. The ellipsoidal air-microcavity is fabricated by splicing a single mode fiber (SMF) and a photonic crystal fiber (PCF) together using a simple arc-discharging technology. By changing the arc-discharging times, the propagation loss can be adjusted and then the differentiation order is tuned. A nearly Gaussian-like optical pulse with 3 dB bandwidth of 8 nm is launched into the differentiator and a 0.65 order differentiation of the input pulse is achieved with a processing error of 2.55%.
Key words:
optical signal processing, optical differentiator, in-fiber ellipsoidal air-microcavity
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| [1] |
Caulfield H J, Dolev S. Why future supercomputing requires optics[J]. Nat Photonics, 2010, 4(5): 261. doi: 10.1038/nphoton.2010.94 |
| [2] |
Tucker R S. The role of optics in computing[J]. Nat Photonics, 2010, 4(7): 405. doi: 10.1038/nphoton.2010.162 |
| [3] |
Li F, Park Y, Azaña J. Complete temporal pulse characterization based on phase reconstruction using optical ultrafast differentiation[J]. Opt Lett, 2007, 32(22): 3364. doi: 10.1364/OL.32.003364 |
| [4] |
Yao J, Zeng F, Wang Q. Photonic generation of ultrawideband signals[J]. J Lightwave Technol, 2007, 25(11): 3219. doi: 10.1109/JLT.2007.906820 |
| [5] |
da Silva J A N, de Campos M L R. Spectrally efficient UWB pulse shaping with application in orthogonal PSM[J]. IEEE Trans Commun, 2007, 55(2): 313. doi: 10.1109/TCOMM.2006.887493 |
| [6] |
Park Y, Kulishov M, Slavík R. Picosecond and sub-picosecond flat-top pulse generation using uniform long-period fiber gratings[J]. Opt Express, 2006, 14(26): 12670. doi: 10.1364/OE.14.012670 |
| [7] |
Park Y, Azaña J, Slavík R. Ultrafast all-optical first- and higher-order differentiators based on interferometers[J]. Opt Lett, 2007, 32(6): 710. doi: 10.1364/OL.32.000710 |
| [8] |
Dong J, Zheng A, Gao D. High-order photonic differentiator employing on-chip cascaded microring resonators[J]. Opt Lett, 2013, 38(5): 628. doi: 10.1364/OL.38.000628 |
| [9] |
Rutkowska K A, Duchesne D, Strain M J. Ultrafast all-optical temporal differentiators based on CMOS-compatible integrated-waveguide Bragg grating[J]. Opt Express, 2011, 19(20): 19514. doi: 10.1364/OE.19.019514 |
| [10] |
Zhang W, Li W, Yao J. Optical differentiator based on an integrated sidewall phase-shifted Bragg grating[J]. IEEE Photonics Technol Lett, 2014, 26(23): 2383. doi: 10.1109/LPT.2014.2357418 |
| [11] |
Li M, Jeong H S, Azaña J. 25-terahertz-bandwidth all-optical temporal differentiator[J]. Opt Eexpress, 2012, 20(27): 28273. doi: 10.1364/OE.20.028273 |
| [12] |
Cuadrado-Laborde C, Andrés M V. In-fiber all-optical fractional differentiator[J]. Opt Lett, 2009, 34(6): 833. doi: 10.1364/OL.34.000833 |
| [13] |
Shahoei H, Xu D X, Schmid J H. Photonic fractional-order differentiator using an SOI microring resonator with an MMI coupler[J]. IEEE Photonics Technol Lett, 2013, 25(15): 1408. doi: 10.1109/LPT.2013.2266252 |
| [14] |
Shahoei H, Albert J, Yao J. Tunable fractional order temporal differentiator by optically pumping a tilted fiber Bragg grating[J]. IEEE Photonics Technol Lett, 2012, 24(9): 730. doi: 10.1109/LPT.2012.2187331 |
| [15] |
Wang T, Wang M, Ni H. Micro-Fabry-Perot interferometer with high contrast based on an in-fiber ellipsoidal cavity[J]. IEEE Photonics Technol Lett, 2012, 24(11): 948. doi: 10.1109/LPT.2012.2185841 |
| [16] |
Wang T, Wang M. Fabry-Pérot fiber sensor for simultaneous measurement of refractive index and temperature based on an in-fiber ellipsoidal cavity[J]. IEEE Photonics Technol Lett, 2012, 24(19): 1733. doi: 10.1109/LPT.2012.2212184 |
| [17] |
Lepetit L, Cheriaux G, Joffre M. Linear techniques of phase measurement by femtosecond spectral interferometry for applications in spectroscopy[J]. JOSA B, 1995, 12(12): 2467. doi: 10.1364/JOSAB.12.002467 |
| [18] |
Dorrer C, Belabas N, Likforman J P. Spectral resolution and sampling issues in Fourier-transform spectral interferometry[J]. JOSA B, 2000, 17(10): 1795. doi: 10.1364/JOSAB.17.001795 |
L H Zhang, S Q Sun, M Li, N H Zhu. All-optical temporal fractional order differentiator using an in-fiber ellipsoidal air-microcavity[J]. J. Semicond., 2017, 38(12): 126001. doi: 10.1088/1674-4926/38/12/126001.
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Manuscript received: 03 May 2017 Manuscript revised: 24 May 2017 Online: Uncorrected proof: 11 November 2017 Corrected proof: 15 November 2017 Published: 01 December 2017
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