| 11. |
- Li, Qiang, et al.
(författare)
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All-optical NRZ-to-AMI conversion using linear filtering effect of silicon microring resonator
- 2009
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Ingår i: Chinese optics letters. - : Shanghai Institute of Optics and Fine Mechanics. - 1671-7694. ; 7:1, s. 12-14
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally demonstrate 10-Cb/s format conversion from non-return-to-zero (NRZ) to alternate-mark-inversion (AMI) using the linear filtering effect of silicon microring resonator. Our discussion and analysis in simulation further show that a 10-Gb/s AMI signal with good quality can be obtained by a resonator with a notch depth larger than 25 dB when the 3-dB bandwidth is 0.4 nm.
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| 12. |
- Li, Qiang, et al.
(författare)
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Dense wavelength conversion and multicasting in a resonance-split silicon microring
- 2008
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Ingår i: Applied Physics Letters. - : AIP Publishing. - 0003-6951 .- 1077-3118. ; 93:8
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally demonstrate all-optical wavelength conversions in a 10 mu m radius resonance-split silicon microring resonator based on free carrier dispersion effect. The split resonance is caused by the mutual coupling between the two countertraveling modes inside the ring resonator. Dense wavelength conversions are performed at data rates from 500 Mbytes/s to 5 Gbytes/s and a dual-channel wavelength multicasting is realized at a data rate of 1.25 Gbytes/s. The resonance splitting phenomenon opens up opportunities to convert more closely spaced wavelengths, thus effectively increasing the system capacity.
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| 13. |
- Li, Qiang, et al.
(författare)
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Fast light in silicon ring resonator with resonance-splitting
- 2009
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Ingår i: Optics Express. - 1094-4087. ; 17:2, s. 933-940
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Tidskriftsartikel (refereegranskat)abstract
- We report experimental demonstration of fast light in an over-coupled ultra-compact silicon ring resonator with resonance-splitting. Strong mutual-coupling induced by the grating inside the ring leads to split resonances and accompanying large anomalous dispersion, thus providing a new approach to realizing fast light in the over-coupled region of the ring resonator. In the experiment, a maximum pulse advancement of 130 ps with low distortion is achieved for a 1-ns signal pulse in a 10-mu m-radius silicon ring resonator. The observed pulse advancement agrees well with the theoretical calculation based on coupled mode theory.
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| 14. |
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| 15. |
- Li, Qiang, et al.
(författare)
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System Performances of On-Chip Silicon Microring Delay Line for RZ, CSRZ, RZ-DB and RZ-AMI Signals
- 2008
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Ingår i: Journal of Lightwave Technology. - : Institute of Electrical and Electronics Engineers (IEEE). - 0733-8724 .- 1558-2213. ; 26:21-24, s. 3744-3751
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Tidskriftsartikel (refereegranskat)abstract
- We theoretically study the group-delay characteristics of a silicon microring resonator based on the coupled mode theory, and experimentally demonstrate error-free operations of an on-chip delay line using a silicon-on-insulator (SOI) microring resonator with a 20-mu m radius. Four signals of different modulation formats are examined at 5 Gb/s, including return-to-zero (RZ), carrier-suppressed return-to-zero (CSRZ), return-to-zero duobinary (RZ-DB), and return-to-zero alternate-mark-inversion (RZ-AMI). Bit error rate (BER) measurements show that the maximal delay times with error-free operations are 80,95, 110, and 65 ps, respectively, corresponding to a fractional group delay of similar to 0.4, similar to 0.5, similar to 0.55, and similar to 0.35. The differences in delay and signal degradations have been investigated based on the signal spectra and pattern dependences. Although the delays are demonstrated in a single ring resonator, the analysis is applicable in slow-light resonance structures such as all-pass filters (APF) and coupled resonator optical waveguides (CROW).
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| 16. |
- Li, Xiaohui, et al.
(författare)
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Concentric silicon micro-ring resonators with enhanced transmission notch depth
- 2008
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE.
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Konferensbidrag (refereegranskat)abstract
- In this work, we have analyzed, fabricated and demonstrated concentric micro-ring resonators in silicon-on-insulator (SOI) structure for enhanced transmission notches. The operation principles of the concentric ring resonators are studied by time-domain coupled-mode theory. Directional coupling between concentric rings offers another freedom in designing deep notch optical filters and ultra-sensitive biosensors. The finite-difference-time-domain (FDTD) simulations have shown the improvement of the notch depth, evenly distributed mode field and the effect of the resonance shift. The device is demonstrated in silicon-on-insulator structure. Transmission notch depth improvement of ~ 15dB is demonstrated for the 21-20.02-μm-radius double-ring structure comparing with the single 21-μm-radius ring.
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| 17. |
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| 18. |
- Liu, Fangfei, et al.
(författare)
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Compact optical temporal differentiator based on silicon microring resonator
- 2008
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Ingår i: Optics Express. - 1094-4087. ; 16:20, s. 15880-15886
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Tidskriftsartikel (refereegranskat)abstract
- We propose and experimentally demonstrate a temporal differentiator in optical field based on a silicon microring resonator with a radius of 40 mu m. The microring resonator operates near the critical coupling region, and can take the first order derivative of the optical field. It features compact size thus is suitable for integration with silicon-on-insulator (SOI) based optical and electronic devices. The performance of this optical differentiator is tested using signals with typical shapes such as Gaussian, sinusoidal and square-like pulses at data rates of 10 Gb/s and 5 Gb/s.
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| 19. |
- Liu, Fangfei, et al.
(författare)
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Optically Tunable Delay Line in Silicon Microring Resonator Based on Thermal Nonlinear Effect
- 2008
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Ingår i: IEEE Journal of Selected Topics in Quantum Electronics. - 1077-260X .- 1558-4542. ; 14:3, s. 706-712
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Tidskriftsartikel (refereegranskat)abstract
- We experimentally demonstrate optically tunable delay fine in a silicon microring resonator with a 20-mu m radius. The delay-tuning mechanism is based on the red shift of the resonance induced by thermal nonlinear effect. We investigate the delay performance of three modulation formats-non-return-to-zero (NRZ), return-to-zero (RZ), and differential phase-shift keying (DPSK) signals at different data rates. Tunable delay is achieved by controlling the power of the continuous-wave (CW) pump with very low tuning threshold, which could be used in microring-resonator-based slow-light structure.
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| 20. |
- Liu, F., et al.
(författare)
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Ultra-compact mode-split silicon microring resonator for format conversion from NRZ to FSK
- 2008
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Ingår i: Proceedings of SPIE - The International Society for Optical Engineering. - : SPIE.
-
Konferensbidrag (refereegranskat)abstract
- We propose and experimentally demonstrate all optical format conversion from non-return-to-zero (NRZ) format to frequency-shift-keying (FSK) format based on free carrier dispersion effect in a silicon mode-split microring resonator. The injection of the high-power NRZ signal generates free carriers leading to the blue shift of the spectrum when a '1' comes. Therefore, there is a selective filtering for the two probes with certain separation located at different position of the split mode according to the information carried by the NRZ signal. Then the NRZ signal is converted to the FSK format. The microring resonator features ultra-compact size with a radius of 10 urn thus is suitable for integration with silicon-on-insulator (SOI) based optical and electronic devices. The split mode can provide large and variable frequency deviation for the FSK signal. 1 Gb/s NRZ signal is successfully converted to FSK format with a frequency deviation of 40 GHz, which can find application for interconnection between a metropolitan area networks (MAN) and a passive optical network (PON) system.
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