Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198190
Y. C. Sun, M. Shih
We report the results of the output characteristics of a circular ring laser diode with two Y-junction output couplers which forms a hybridization of a circular ring resonator and a linear U shape resonator. It shows that the ring laser has two emission characteristic spectrums, a single mode emission at 652.86nm and a multi-modes emission at around 652.24nm by injection current of 70mA. Results of light-injection current measurements are presented to reveal the mechanism of modes hopping of laser outputs due to interaction between these two resonators. It shows that this novel circular ring laser diode provides an alternative approach for optical signal modulation and its potential applications in multi-wavelength optical communication system.
{"title":"A circular ring laser diode with tow Y-junction couplers","authors":"Y. C. Sun, M. Shih","doi":"10.1109/WOCC.2012.6198190","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198190","url":null,"abstract":"We report the results of the output characteristics of a circular ring laser diode with two Y-junction output couplers which forms a hybridization of a circular ring resonator and a linear U shape resonator. It shows that the ring laser has two emission characteristic spectrums, a single mode emission at 652.86nm and a multi-modes emission at around 652.24nm by injection current of 70mA. Results of light-injection current measurements are presented to reveal the mechanism of modes hopping of laser outputs due to interaction between these two resonators. It shows that this novel circular ring laser diode provides an alternative approach for optical signal modulation and its potential applications in multi-wavelength optical communication system.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"57 26","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120885466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198160
G. B. Eslamlu, M. Sabaei, M. Fereydooni
We investigate the problem of finding an efficient topology for delay-constrained data in WSNs. Since topology control may increase the end-to-end delay, one of the criterion's that should be considered in topology control algorithms is restricting delay. Existing works utilized hop count measure for delay; yet hop count is not a suitable criterion for delay measurement because the delay is dependent on many factors such as propagation and contention delay. We introduced an appropriate measure for the end-to-end delay computation and present a novel delay-constraint topology control algorithm (NDTC). Results show NDTC satisfy the delay constraint with acceptable energy consumption.
{"title":"The novel delay-constraint topology control algorithm in WSNs","authors":"G. B. Eslamlu, M. Sabaei, M. Fereydooni","doi":"10.1109/WOCC.2012.6198160","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198160","url":null,"abstract":"We investigate the problem of finding an efficient topology for delay-constrained data in WSNs. Since topology control may increase the end-to-end delay, one of the criterion's that should be considered in topology control algorithms is restricting delay. Existing works utilized hop count measure for delay; yet hop count is not a suitable criterion for delay measurement because the delay is dependent on many factors such as propagation and contention delay. We introduced an appropriate measure for the end-to-end delay computation and present a novel delay-constraint topology control algorithm (NDTC). Results show NDTC satisfy the delay constraint with acceptable energy consumption.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116047262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198174
Tassamon Yipsirimetee, P. Kaewplung
This paper proposes an algorithm for the employment of dispersion-compensating units (DCUs) and for the employment of polarization-mode-dispersion compensators (PMDCs) on 40-Gbps-per-channel-based wavelength-routed optical fiber network. The algorithm can be used for both non-slope compensated (NS)-DCU and slope-compensated (SC)-DCU. We use the optical pan-European network (OPEN) as a sample network. By applying our algorithms, we show that only the NS-DCUs cannot be only used for the OPEN due to the over and under compensation. However, we demonstrate that the employment of only SC-DCUs, whose number is 108 units, is capable for achieving all the light paths using all wavelengths in c band to be well below dispersion limit. Moreover, in case of single link failure, OPEN with path protection requires 220 units SC-DCU. We also show the possibility of employing the combination of NS-DCUs and SC-DCUs in OPEN. In this case, the required total number of DCUs is only 67 units. For the employment of PMDC, it is not needed to be installed in OPEN. For the PMD compensation, we show that the OPEN does not need the PMD compensation. However, in case of extending the network in such a way that the longest shortest path becomes 2,852 km, 4 PMDCs are required.
{"title":"Optimal dispersion compensation and polarization-mode dispersion compensation in all-optical 40 Gbps-per-channel-based WDM wavelength-routed optical fiber networks","authors":"Tassamon Yipsirimetee, P. Kaewplung","doi":"10.1109/WOCC.2012.6198174","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198174","url":null,"abstract":"This paper proposes an algorithm for the employment of dispersion-compensating units (DCUs) and for the employment of polarization-mode-dispersion compensators (PMDCs) on 40-Gbps-per-channel-based wavelength-routed optical fiber network. The algorithm can be used for both non-slope compensated (NS)-DCU and slope-compensated (SC)-DCU. We use the optical pan-European network (OPEN) as a sample network. By applying our algorithms, we show that only the NS-DCUs cannot be only used for the OPEN due to the over and under compensation. However, we demonstrate that the employment of only SC-DCUs, whose number is 108 units, is capable for achieving all the light paths using all wavelengths in c band to be well below dispersion limit. Moreover, in case of single link failure, OPEN with path protection requires 220 units SC-DCU. We also show the possibility of employing the combination of NS-DCUs and SC-DCUs in OPEN. In this case, the required total number of DCUs is only 67 units. For the employment of PMDC, it is not needed to be installed in OPEN. For the PMD compensation, we show that the OPEN does not need the PMD compensation. However, in case of extending the network in such a way that the longest shortest path becomes 2,852 km, 4 PMDCs are required.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123380203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198144
C. Yeh, H. Chen, C. Chow
In this work, we propose a novel modulation of four-band OFDM channels within 10-GHz bandwidth in 40-Gb/s PON with 128 ONUs. Here, we first propose using multi-band OFDM modulation format applying in -0.7 chirp parameter Mach-Zehnder modulator (MZM) to improve and compensate the fiber dispersion and RF fading effects. Moreover, -0.37 dB power penalty at FEC level (BER of 3.8×10-3) is also observed after 20 km fiber transmission.
{"title":"Employing four-band OFDM signals for 40-Gb/s PON with 128 ONUs in single-Wavelength in 10-GHz bandwidth","authors":"C. Yeh, H. Chen, C. Chow","doi":"10.1109/WOCC.2012.6198144","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198144","url":null,"abstract":"In this work, we propose a novel modulation of four-band OFDM channels within 10-GHz bandwidth in 40-Gb/s PON with 128 ONUs. Here, we first propose using multi-band OFDM modulation format applying in -0.7 chirp parameter Mach-Zehnder modulator (MZM) to improve and compensate the fiber dispersion and RF fading effects. Moreover, -0.37 dB power penalty at FEC level (BER of 3.8×10-3) is also observed after 20 km fiber transmission.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121237490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198159
You-Hsien Lin, Ta Ko, Tsung-Yu Tsai, Shao-Ying Yeh, Terng-Yin Hsu
The complexity of beamforming, such as complexity complex weighting and combining process, are extremely important for implementation. This work presents a low complexity time-domain statistic noise suppression and hierarchical beam search algorithm to improve performance in receivers. For SIMO-OFDM systems, the complexity of the hierarchical beam search algorithm is O(n2log2n). This work proposes a simple hierarchical beam search to find the best steering vector. Through performance evaluation, the BER performance is significantly improved with about 3dB under 10^-5 BER in the case that L1=6 and L2=2 compared to that in the case L1=4 and L2=2. Besides, the BER performance is already quietly close to that achieved by the ideal beamform in the case of L1=6 and L2=4. This setting is a good choice which achieves a good tradeoff between the performance and the computational complexity. In addition, this algorithm is well-matched to different specifications.
{"title":"Design and analysis of low-complexity blind beam steering scheme for receive beamform","authors":"You-Hsien Lin, Ta Ko, Tsung-Yu Tsai, Shao-Ying Yeh, Terng-Yin Hsu","doi":"10.1109/WOCC.2012.6198159","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198159","url":null,"abstract":"The complexity of beamforming, such as complexity complex weighting and combining process, are extremely important for implementation. This work presents a low complexity time-domain statistic noise suppression and hierarchical beam search algorithm to improve performance in receivers. For SIMO-OFDM systems, the complexity of the hierarchical beam search algorithm is O(n2log2n). This work proposes a simple hierarchical beam search to find the best steering vector. Through performance evaluation, the BER performance is significantly improved with about 3dB under 10^-5 BER in the case that L1=6 and L2=2 compared to that in the case L1=4 and L2=2. Besides, the BER performance is already quietly close to that achieved by the ideal beamform in the case of L1=6 and L2=4. This setting is a good choice which achieves a good tradeoff between the performance and the computational complexity. In addition, this algorithm is well-matched to different specifications.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133197570","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198193
Chin-Cheng Hu, Chin-Wei Lin, Hsun-Cheng Lee, Ching-Sheu Wang
This paper describes an innovative scheme of optical UNI converter. The enhanced converter solves the UNI interworking problem between the two kinds of models for control plane, ITU-T ASON/OIF UNI [1][2] and IETF GMPLS.
{"title":"An innovative scheme for the UNI interworking of ASON and GMPLS","authors":"Chin-Cheng Hu, Chin-Wei Lin, Hsun-Cheng Lee, Ching-Sheu Wang","doi":"10.1109/WOCC.2012.6198193","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198193","url":null,"abstract":"This paper describes an innovative scheme of optical UNI converter. The enhanced converter solves the UNI interworking problem between the two kinds of models for control plane, ITU-T ASON/OIF UNI [1][2] and IETF GMPLS.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"324 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132035481","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198146
E. Wong
Efforts in reducing the power consumption of next-generation optical transceivers through the use of 10 Gb/s vertical cavity surface emitting lasers (VCSELs) in optical network units (ONUs) will be reviewed. Energy savings from a VCSEL ONU in power saving mode will be compared to an active distributed feedback laser based ONU, and will be analytically computed as a function of network parameters. Guidance on the specific power saving mode in order to maximise energy efficiency throughout the day will be outlined.
{"title":"Energy efficient passive optical networks with low power VCSELs","authors":"E. Wong","doi":"10.1109/WOCC.2012.6198146","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198146","url":null,"abstract":"Efforts in reducing the power consumption of next-generation optical transceivers through the use of 10 Gb/s vertical cavity surface emitting lasers (VCSELs) in optical network units (ONUs) will be reviewed. Energy savings from a VCSEL ONU in power saving mode will be compared to an active distributed feedback laser based ONU, and will be analytically computed as a function of network parameters. Guidance on the specific power saving mode in order to maximise energy efficiency throughout the day will be outlined.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115939852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198191
Ming-Fang Huang, N. Cvijetic, Ting Wang
In this paper, we discuss recent progress in orthogonal frequency division multiplexing (OFDM)-based passive optical networks (PON) in a wavelength-reused optical network unit (ONU). To fully regenerate the uplink OFDMA and avoid large bandwidth of analog-to-digital converters (ADCs), a coherent receiver with selected sub-band technique is demonstrated.
{"title":"Wavelength-reused ONUs for next-generation optical WDM/OFDMA-PON","authors":"Ming-Fang Huang, N. Cvijetic, Ting Wang","doi":"10.1109/WOCC.2012.6198191","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198191","url":null,"abstract":"In this paper, we discuss recent progress in orthogonal frequency division multiplexing (OFDM)-based passive optical networks (PON) in a wavelength-reused optical network unit (ONU). To fully regenerate the uplink OFDMA and avoid large bandwidth of analog-to-digital converters (ADCs), a coherent receiver with selected sub-band technique is demonstrated.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115645439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198155
B. Hariharan, Sreejith Kallummil, Sangeeth Kumar
Establishing emergency communication is an urgent task in disaster relief operations. To provide urgent communication facilities to rescue teams and victims without any interruption due to network failure is more complicated. This paper proposes a framework for seamless handoff between various available networks thereby facilitating emergency communication without any disruption .The system creates an overlay network using the smart phones and laptops and the available networks. Wi-Fi/Wi-MAX communication is used between the smart phones if there is no cellular coverage. Furthermore, cellular gateway is used as an alternative remote communication means when the expansion of local networks reaches a working cellular base station. A new efficient algorithm which provides an optimization of target selection, heterogeneous hand over decision and hand over triggering condition has been proposed for seamless heterogeneous handoff. The overall system architecture, the relevant network elements, and the methods of establishing and integrating them to be a mission system are described. The proposed system can help to reduce the handoff time, helps to save battery life, support more terminal types, and provide emergency management services.
{"title":"Power aware seamless emergency communication for heterogeneous wireless networks","authors":"B. Hariharan, Sreejith Kallummil, Sangeeth Kumar","doi":"10.1109/WOCC.2012.6198155","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198155","url":null,"abstract":"Establishing emergency communication is an urgent task in disaster relief operations. To provide urgent communication facilities to rescue teams and victims without any interruption due to network failure is more complicated. This paper proposes a framework for seamless handoff between various available networks thereby facilitating emergency communication without any disruption .The system creates an overlay network using the smart phones and laptops and the available networks. Wi-Fi/Wi-MAX communication is used between the smart phones if there is no cellular coverage. Furthermore, cellular gateway is used as an alternative remote communication means when the expansion of local networks reaches a working cellular base station. A new efficient algorithm which provides an optimization of target selection, heterogeneous hand over decision and hand over triggering condition has been proposed for seamless heterogeneous handoff. The overall system architecture, the relevant network elements, and the methods of establishing and integrating them to be a mission system are described. The proposed system can help to reduce the handoff time, helps to save battery life, support more terminal types, and provide emergency management services.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128521815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-04-19DOI: 10.1109/WOCC.2012.6198142
Liang Huang, T. Lee
The queueing behavior of Hybrid Automatic Repeat reQuest (ARQ) system over wireless channel is analyzed in this paper. The wireless channel is modeled as a two-state Markovian process. Arriving packets, which are saved in a first-in-first-out (FIFO) buffer before being transmitted over a wireless channel, may be blocked due to buffer overflow. We obtain the closed-form expressions of queueing state probabilities and queueing delay. For large buffer capacity, we derive a new coefficient of the exponential approximation for buffer overflow probability which fits the simulation results much better than before.
{"title":"Queueing behavior of Hybrid ARQ wireless system with finite buffer capacity","authors":"Liang Huang, T. Lee","doi":"10.1109/WOCC.2012.6198142","DOIUrl":"https://doi.org/10.1109/WOCC.2012.6198142","url":null,"abstract":"The queueing behavior of Hybrid Automatic Repeat reQuest (ARQ) system over wireless channel is analyzed in this paper. The wireless channel is modeled as a two-state Markovian process. Arriving packets, which are saved in a first-in-first-out (FIFO) buffer before being transmitted over a wireless channel, may be blocked due to buffer overflow. We obtain the closed-form expressions of queueing state probabilities and queueing delay. For large buffer capacity, we derive a new coefficient of the exponential approximation for buffer overflow probability which fits the simulation results much better than before.","PeriodicalId":118220,"journal":{"name":"2012 21st Annual Wireless and Optical Communications Conference (WOCC)","volume":"516 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123084133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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