共查询到20条相似文献,搜索用时 15 毫秒
1.
Ossieur P. Melange C. De Ridder T. Bauwelinck J. Baekelandt B. Xing-Zhi Qiu Vandewege J. 《Photonics Technology Letters, IEEE》2008,20(20):1706-1708
2.
《Selected Areas in Communications, IEEE Journal on》2005,23(8):1632-1642
In this paper, we address the design and management issues in routing a mixture of OC-192 and OC-768 streams in wavelength-routed optical networks. We assume that fiber links in the network are heterogeneous with respect to their transmission capability (i.e., links are designed to handle a given maximum bit-rate imposed by regenerator spacing).We investigate the issues of routing connection demands of various bit-rate requirements in such heterogeneous networks. In this environment, we introduce the routing of multirate traffic (RMT) problem. The RMT problem is informally defined as the process of finding the best routing which maximizes the total bandwidth carried in the network, for a set of sessions, within a given TDM equipment budget. We propose a two-phase optimization scheme (two-phase RMT). This scheme first obtains a basis solution used in routing 40-Gb/s traffic only on OC-768 capable links without the use of TDM equipment. In the second phase, an iterative routing, rerouting, and resource allocation step is used to optimize the total bandwidth carried in the network, while allowing 40-Gb/s traffic to be routed on OC-768 incapable links by the proper installation of TDM multiplexors and demultiplexers at some strategic locations in the network. Numerical results reveal the following:. 1) the two-phase RMT optimization algorithm provides substantial savings in terms of both the total TDM equipment installed and number of wavelengths used; 2) noticeable enhancements of the bandwidth utilization and the TDM budget are observed when the route-optimization takes into account the transmission quality of the links; and 3) the use of intermediate TDM multiplexing/demultiplexing functions provides substantial savings, in terms of the total number of channels, over the source-splitting scheme. 相似文献
3.
《Photonics Technology Letters, IEEE》2008,20(18):1545-1547
4.
《Advanced Packaging, IEEE Transactions on》2009,32(3):644-649
5.
Kang I. Rasras M. Dinu M. Cappuzzo M. Gomez L.T. Chen Y.F. Buhl L. Cabot S. Wong-Foy A. Patel S.S. Giles C.R. Dutta N. Jaques J. Piccirilli A. 《Photonics Technology Letters, IEEE》2008,20(12):1024-1026
We demonstrate all-optical recognition of a byte pattern embedded in phase-shift-keyed data streaming at 40 Gb/s. We use matched filtering to generate an autocorrelation pulse indicating the pattern matching. Matched filtering is implemented using a reconfigurable silica planar-lightwave-circuit optical delay-line filter. We show excellent discrimination against spurious patterns consistent with the theoretical predictions. 相似文献
6.
Bidirectional ROF Links Using Optically Up-Converted DPSK for Downstream and Remodulated OOK for Upstream 总被引:1,自引:0,他引:1
We propose a novel radio-over-fiber system to provide full-duplex services by using optical differential phase-shift keying modulation format at the central station for downstream and on-off keying remodulation of the downlink carrier at the base station (BS) for upstream. The optical carrier suppression modulation scheme is employed to simultaneously generate and up-convert 40-GHz optical millimeter wave. As the same optical carrier is used for both uplink and downlink, no additional light source is required at the BS, which greatly reduces the cost and simplifies the overall system. Simulations and experimental results show that the bidirectional 2.5-Gb/s data is successfully transmitted over 40-km single-mode fiber (SMF-28) with less than 2-dB power penalty 相似文献
7.
《Photonics Technology Letters, IEEE》2008,20(24):2081-2083
8.
《Lightwave Technology, Journal of》2010,28(4):494-501
9.
Coherent Optical 25.8-Gb/s OFDM Transmission Over 4160-km SSMF 总被引:1,自引:0,他引:1
Jansen S.L. Morita I. Schenk T.C.W. Takeda N. Tanaka H. 《Lightwave Technology, Journal of》2008,26(1):6-15
We discuss coherent optical orthogonal frequency division multiplexing (CO-OFDM) as a suitable modulation technique for long-haul transmission systems. Several design and implementation aspects of a CO-OFDM system are reviewed, but we especially focus on phase noise compensation. As conventional CO-OFDM transmission systems are very sensitive to laser phase noise a novel method to compensate for phase noise is introduced. With the help of this phase noise compensation method we show continuously detectable OFDM transmission at 25.8 Gb/s data rate (20 Gb/s after coding) over 4160-km SSMF without dispersion compensation. 相似文献
10.
This correspondence compares OOK and low-order PPM signaling formats in terms of bit error probabilities versus required signal counts per bit. The results show that QPPM requires 3 dB less signal than OOK, while BPPM requires the same or slightly more than OOK for the same performance. Optimum APD gain values are from 200 to 400. When using QPPM,k_{eff} = 0.006 , and optimum gain, 60 signal counts/bit are required at 500 Mbits/s for a 10-6bit error probability. 相似文献
11.
A signal remodulation scheme of 10-Gb/s differential phase-shift keying(DPSK) downstream and 10-Gb/s on-off keying(OOK) upstream using a semiconductor optical amplifier(SOA) and a Mach-Zehnder intensity modulator(MZ-IM) at the optical networking unit(ONU) side for wavelength division multiplexed passive optical network(WDM PON) is proposed.Simulation results indicate that error-free operation can be achieved in a 20-km transmission,and the receiver sensitivity of return-to-zero differential phase-shift keying(RZ-DPSK) is higher than nonreturn-to-zero differential phase-shift keying(NRZ-DPSK) in the proposed scheme. 相似文献
12.
《Lightwave Technology, Journal of》2009,27(3):253-265
13.
We report 40-Gb/s capability of 50-mum core plastic optical fiber using differential modal delay measurements and power penalty due to intersymbol interference computations. The results are explained via a comprehensive multimode fiber model that includes mode coupling (MC) and differential modal attenuation (DMA). We show that strong MC can enable 40-Gb/s transmission for reach in excess of 100 m even in the presence of irregularities in the refractive index profile that prevent 10-Gb/s performance without MC. Furthermore, we show that DMA effects are negligible and that the mode power distributions are not a good indicator of bandwidth. 相似文献
14.
Wavelength Remodulation Using DPSK Down-and-Upstream With High Extinction Ratio for 10-Gb/s DWDM-Passive Optical Networks 总被引:1,自引:0,他引:1
We propose and demonstrate a novel wavelength remodulation scheme using differential phase-shift keying (DPSK) modulation format in both downstream and upstream signals for ldquocolorlessrdquo dense wavelength-division-multiplexed (DWDM) passive optical networks (PONs). The scheme enables high extinction ratio in both downstream and upstream remodulated signals. Error-free operation was achieved in a 20-km-reach 10-Gb/s DWDM-PON without dispersion compensation. Timing misalignment tolerance between downstream and upstream remodulated signals and maximum launched optical power for the proposed scheme are studied. Comparison with other wavelength remodulation schemes for DWDM-PONs is also performed, showing the proposed scheme can be a potential candidate for next-generation wavelength reuse DWDM-PONs. 相似文献
15.
Heterodyne detection of 10-Gb/s nonreturn-to-zero (NRZ) on-off keying and NRZ differential phase-shift keying is demonstrated. The noise performance of the heterodyne receiver with and without the use of an optical preamplifier is experimentally investigated 相似文献
16.
40-Gb/s tandem electroabsorption modulator 总被引:3,自引:0,他引:3
Mason B. Ougazzaden A. Lentz C.W. Glogovsky K.G. Reynolds C.L. Przybylek G.J. Leibenguth R.E. Kercher T.L. Boardman J.W. Rader M.T. Geary J.M. Walters F.S. Peticolas L.J. Freund J.M. Chu S.N.G. Sirenko A. Jurchenko R.J. Hybertsen M.S. Ketelsen L.J.P. Raybon G. 《Photonics Technology Letters, IEEE》2002,14(1):27-29
In this letter, we have developed a tandem electroabsorption modulator with an integrated semiconductor optical amplifier that is capable of both nonreturn-to-zero and return-to-zero (RZ) data transmission at 40 Gb/s. The tandem modulator consists of a broad-band data encoder and a narrow-band pulse carver. The pulse carver is able to produce 5-ps pulses with more than 20 dB of extinction. The on-chip semiconductor optical amplifier provides up to 8.5 dB of fiber-to-fiber gain and enables the modulator to be operated with zero insertion loss. Devices have been realized with greater than 40-GHz bandwidth, and 13-dB dynamic extinction for a 2.5-V swing. For optimized designs bandwidths of nearly 60 GHz: have been realized. Using these devices penalty free RZ data transmission over a 100-kin dispersion compensated fiber link has been demonstrated with a received power sensitivity of -29 dBm 相似文献
17.
Contestabile G. Presi M. Proietti R. Ciaramella E. 《Photonics Technology Letters, IEEE》2008,20(13):1133-1135
We experimentally demonstrate a scheme for all-optical reshaping at 40 Gb/s that is wavelength preserving and transparent to both nonreturn-to-zero and return-to-zero on-off keying signals. Eye-diagram reshaping is confirmed by means of bit-error rate versus threshold measurements on both modulation formats. The scheme is based on cross-gain compression in an semiconductor optical amplifier (SOA) and uses two SOAs that are not in interferometric configuration. Due to its working principle, this method is polarization-independent and suitable, in principle, for higher bit rates. 相似文献
18.
Dong Gun Kam Joungho Kim 《Advanced Packaging, IEEE Transactions on》2008,31(2):258-266
A 40-Gb/s packaging solution that uses low-cost wire-bonded plastic ball grid array (WB-PBGA) technology is presented. Since such a high speed was beyond the reach of conventional package designs, a new design methodology was proposed-discontinuity cancellation in both signal-current and return-current paths. The 3-D structures of bonding wires, vias, solder ball pads, and power distribution networks were optimized for the discontinuity cancellation. Two versions of four-layer WB-PBGA packages were designed; one according to the proposed methodology and the other conventionally. The proposed design methodology was verified with full-wave simulation, passive bandwidth measurement, time domain reflectometry (TDR), eye diagram measurement, and jitter analysis. 相似文献
19.
《Lightwave Technology, Journal of》2009,27(3):168-176
20.
《Photonics Technology Letters, IEEE》2008,20(19):1597-1599