OPTIK ALOQA TARMOQLARIDA XAVFSIZLIKNI TA’MINLASHDA OPTIK STEANOGRAFIYANI OMMAVIY BPSK KANALI ORQALI OPTIK CDMA SIGNALLARIDA QO‘LLASH
Keywords:
Muhammad al-Xorazmiy nomidagi Toshkent axborot texnologiyalari universiteti, o‘qituvchi-stajyorAbstract
Biz ushbu tadqiqot ishida SAC-OCDMAga asoslangan steganografiya tizimlari orasidagi signal va quvvatni o‘rtacha nisbatini tahlil qilamiz. SAC-OCDMA tizimi mavjud shovqinlardan faqat PIIN va termal shovqinlarni o‘z ichiga oladi. Tadqiqot ishida faqat PIIN shovqini ko‘rib chiqildi, chunki qabul qilingan optik quvvat katta bo‘lganda u dominant shovqin hisoblanadi. Natijalar bit-xato tezligi (BER) ifodalarini aniq olish orqali kengaytiriladi. Tizim xavfsizligini oshirish uchun tarmoq orqali yuborishdan oldin uzaytirilgan yashirin signalga spektr amplitudasini kodlash qo‘llaniladi. Tizim har xil kod turlari va kod uzunligi sharti ostida baholanadi. Yashirin xabar muvozanat detektori tomonidan aniqlanadi, u yashirin kanalning sezgirligini 3dBga oshirishi mumkin.
References
H. Chen et al., “A Tunable Encoder/Decoder Based on Polarization Modulation for the SAC-OCDMA PON,” IEEE Photonics Technology Letters, vol. 23, no. 11, pp. 748–750, Jun. 2011, doi: 10.1109/LPT.2011.2132701.
Y. K. Huang, B. Wu, I. Glesk, E. E. Narimanov, T. Wang, and P. R. Prucnal, “Combining cryptographic and steganographic security with self-wrapped optical code division multiplexing techniques,” Electron Lett, vol. 43, no. 25, pp. 1449–1451, 2007, doi: 10.1049/EL:20071981.
. K Kravtsov et al., “Demonstration of optical steganography transmission using temporal phase coded optical signals with spectral notch filtering,” Optics Express, Vol. 18, Issue 12, pp. 12415-12420, vol. 18, no. 12, pp. 12415–12420, Jun. 2010, doi: 10.1364/OE.18.012415.
J. F. Huang, C. C. Yang, and S. P. Tseng, “Complementary Walsh-Hadamard coded optical CDMA coder/decoders structured over arrayed-waveguide grating routers,” Opt Commun, vol. 229, no. 1–6, pp. 241–248, Jan. 2004, doi: 10.1016/J.OPTCOM.2003.11.007.
J. P. HERITAGE, O. E. MARTINEZ, and A. FRENKEL, “Compensation of negative group velocity dispersion in optical fibers with a grating and telescope pulse compressor,” Conference on Lasers and Electro-Optics (1988), paper TUP4, p. TUP4, Apr. 1988, Accessed: Feb. 21, 2023. [Online]. Available: https://opg.optica.org/abstract.cfm?uri=CLEO-1988-TUP4
Z. Wei, H. Ghafouri-Shiraz, and H. M. H. Shalaby, “Modified Quadratic Congruence Codes for Fiber Bragg-Grating-Based Spectral-Amplitude-Coding Optical CDMA Systems,” Journal of Lightwave Technology, Vol. 19, Issue 9, pp. 1274-, vol. 19, no. 9, pp. 1274-, Sep. 2001, Accessed: Feb. 21, 2023. [Online]. Available: https://opg.optica.org/abstract.cfm?uri=jlt-19-9-1274
C. T. Yen and G. J. Huang, “Optical steganography transmission of optical CDMA signals over a public BPSK channel,” Engineering Computations (Swansea, Wales), vol. 33, no. 6, pp. 1810–1824, Aug. 2016, doi: 10.1108/EC-08-2015-0253.
Z. Gao, X. Wang, N. Kataoka, and N. Wada, “Stealth Transmission of Time Domain Spectral Phase Encoded OCDMA Signal over WDM System,” Optical Fiber Communication Conference (2010), paper OThW5, p. OThW5, Mar. 2010, doi: 10.1364/OFC.2010.OTHW5.
