{"title":"Erbium doped fiber amplifier in WDM systems using different glass hosts","authors":"M. M. Keshk, M. Aly, A. Okaz, A.M. El-Rashedy","doi":"10.1109/PAIA.2005.205056","DOIUrl":"https://doi.org/10.1109/PAIA.2005.205056","url":null,"abstract":"Mulitchannel erbium-doped fiber amplifiers (EDFAs) are analyzed based on the rate equations with an analytical approximation model. Forward pumping is considered tacking both amplified spontaneous emissions (ASE) scattering loss into account. The output signal power is calculated for ten multiplexed channels along the fiber. The optimum amplifier length which corresponds to the maximum output signal power is then studied showing how it is affected by pump power and input signal power. Finally, the amplifier gain at the optimum length is calculated for each channel. This procedure is repeated for eight different glass hosts, namely; alumino-germanosilicate, bismuth, LiNbO/sub 3/, tellurite, sodium niobium phosphate, oxyfluoride silicate, Al/sub 2/O/sub 3/ and fluoride phosphate gasses.","PeriodicalId":430511,"journal":{"name":"2005 Fifth Workshop on Photonics and its Applications","volume":"842 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133904661","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}
E. El-Badawy, A.E.-N.A. Mohammed, F. El-Halafawy, Y.S. El-Attar
{"title":"Ultra-multiplexing transmission in high-speed optical land cables with reduction of four-wave mixing","authors":"E. El-Badawy, A.E.-N.A. Mohammed, F. El-Halafawy, Y.S. El-Attar","doi":"10.1109/PAIA.2005.205054","DOIUrl":"https://doi.org/10.1109/PAIA.2005.205054","url":null,"abstract":"Ultra-high speed optical land cables of ultra-product (capacity*repeater spacing) in advanced optical communication systems are electro-optically designed over wide ranges of the affecting parameters. Reduction of four-wave mixing is processed. Soliton transmission technique is employed through two ultra multiplexing techniques (200 links (UW-SDM) plus 4000 channels (UW-WDM) over optical window of special interest from 1.45 mum up to 1.65 mum. The employed optical window of 200 nm is suggested due to the maximum ability of amplifiers. The chromatic dispersion is squeezed at any desired value. Different links in such cable are designed at different thermal fields. The spaced multiplexed links are equally distributed over minor inner cores in the major cable. Each link has its design parameters (the percentage of germania, the relative refractive index difference, and the central wavelength of sub-optical window). It is found that the maximization of the product of transmitted bit rate and the repeater spacing assures the need of ultra-multiplexing; there are positive correlations for either the spectral losses or the total chromatic dispersion and the thermal environmental conditions; after installation, the thermal variations at different cable locations create severe reductions in both the transmitted bit rate and the repeater spacing; negative thermal sensitivities are found (as DeltaT = plusmnve, DeltaBT = mnplusve, and DeltaRs = mnplusve); higher repeater spacing, higher products, and higher bit rates are obtained at lower squeezed dispersions at any temperature; and the same sorts of variations as in v are obtained as the number of links increases; each link must possesses special design parameters to yield the same squeezed chromatic dispersion. These design parameters are the germania percentage and the relative refractive index difference","PeriodicalId":430511,"journal":{"name":"2005 Fifth Workshop on Photonics and its Applications","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123268994","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}
Y.M. Abd-El Malek, Z. El-Sahn, H. Shalaby, E. El-Badawy
{"title":"Proposed optical random access CDMA protocol with stop & wait ARQ","authors":"Y.M. Abd-El Malek, Z. El-Sahn, H. Shalaby, E. El-Badawy","doi":"10.1109/PAIA.2005.205057","DOIUrl":"https://doi.org/10.1109/PAIA.2005.205057","url":null,"abstract":"A new random access protocol for optical code division multiple access (CDMA) communication systems is proposed. Stop & wait automatic repeat request (ARQ) is implemented at the optical link layer. A detailed state diagram and a mathematical model based on the equilibrium point analysis (EPA) technique are presented. Several performance measures are evaluated under different network parameters. In our numerical calculations both chip-level and correlation models have been adopted at the receiver side. Furthermore, the effect of thermal noise is studied. We also compare the performance of the proposed protocol to that of the round robin receiver/transmitter (R/sup 3/T) protocol which is based on a go back-n technique. We prove by numerical analysis that the proposed protocol is less complex and significantly outperforms the R/sup 3/T protocol. Our results also reveal that the performance of the proposed protocol with correlation receivers is competitive to that of the R/sup 3/T protocol with chip-level receivers, which reduces the overall system cost.","PeriodicalId":430511,"journal":{"name":"2005 Fifth Workshop on Photonics and its Applications","volume":"271 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124384680","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}
{"title":"Penalities of performance of optical fiber communication cables in thermo-irradiated fields","authors":"F. El-Halafawy, A. Mohamed, H.M. El-Hapen","doi":"10.1109/PAIA.2005.205053","DOIUrl":"https://doi.org/10.1109/PAIA.2005.205053","url":null,"abstract":"In the present paper, we have analyzed deeply and parametrically both the penalties of performance of single mode optical fiber cables employed in thermo-irradiated fields in nuclear projects environments and space communication systems. The radiation effects as well as the thermal effects are modeled and investigated over the practical ranges of interest. Four dependent effects {spectral losses, pulse spreading, fiber bandwidth, and transmitted bit rate} as well as the sensitivities of variations of the causes are studied through the four defined sensitivities {bit rate-spectral losses, bit rate-bandwidth, bit rate-temperature, bit rate-dose}. Severe reduction effects of both the thermal field and the irradiation field are assured and concluded","PeriodicalId":430511,"journal":{"name":"2005 Fifth Workshop on Photonics and its Applications","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131415676","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}
{"title":"Thulium doped fiber amplifier in the S/S/sup +/ band employing different concentration profiles","authors":"M. Aly, M. Nasr, H. Seleem","doi":"10.1109/PAIA.2005.205055","DOIUrl":"https://doi.org/10.1109/PAIA.2005.205055","url":null,"abstract":"This work contains a comparative study for the signal gain of thulium-doped fiber amplifier (TDFA) in the S-band. Different doping techniques are used to obtain different concentration profiles in silica fibers. The optimal one is found to be the step like profile. TDFA is investigated in new prepared glass hosts. These hosts include: silicate, bismuth, fluoride, tellurite, chalcohalide, and heavy metal oxide. The effect of the different parameters on signal gain of the optical amplifiers is studied, followed by a comparison to select the best glass host. Results showed that the highest gain can provide by bismuth (Bi) glass host and broad band gain from 1450 nm to 1520 nm with a peak wavelength around 1480 nm, A maximum gain above 28.5 dB is obtained with 11 m long Bi-TDFA. These characteristics indicate that Bi-TDFA is a very promising candidate for S-band amplifiers.","PeriodicalId":430511,"journal":{"name":"2005 Fifth Workshop on Photonics and its Applications","volume":"203 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134124987","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}