MODEL OF KEY SEQUENCE GENERATION IN A COHERENT DUAL-BAND OPTICAL SYSTEM WITH PHASE-SHIFT KEYED RADIO SIGNAL MODULATION
DOI:
https://doi.org/10.18522/2311-3103-2026-1-%25pKeywords:
Key distribution, coherent radiation, configuration of two Mach-Zehnder interferometers, formation of dual-band optical radiation, quadrature phase-shift keyed radio signal, subcarrier frequencyAbstract
Coherent optical communication using quadrature phase-shift keying (QPSK) provides high-speed data transmission using in-phase and quadrature (IQ) modulation formats over long distances. A quadrature optical modulator with two Mach-Zehnder interferometers in a two-way configuration with simultaneous phase shift in its arms significantly improves the technical characteristics and ensures the electromagnetic compatibility of digital signal transmission paths. The two-cycle configuration of an optical modulator is the basis for high-speed and noise-resistant data transmission. The research results prove that, after certain corrections to the known coherent optical transmission structures, the system can be used for key distribution. The structure of a coherent two-band optical key sequence formation system is presented. The model for generating optical radiation with modulation by a phase-shifted radio signal is based on a quadrature optical modulator with two parallel Mach-Zehnder interferometers with constant bias voltages on all control electrode arms. Key sequence formation is implemented by modulating the in-phase and quadrature components of radio signals at the subcarrier frequency. A set of two amplitude multiplication coefficients for each bit is specified by the electronic encoding device. The coefficients represent the signals that modulate the amplitude of the in-phase and quadrature components of the subcarrier frequency, respectively. The optical radiation generated at the modulator output provides key distribution (setting the values of zero "0" and one "1" bits in the binary number system) according to a protocol with four phase states in the rectangular and diagonal bases. A module for controlling the encoding of the in-phase and quadrature components of a radio signal at a subcarrier frequency is proposed. The use of quadrature phase shift keying (QPSK) provides noise immunity to external influences at high data transfer rates
References
1. Bylina M.S., Glagolev S.F., Dyubov A.S. Sravnitel'nyy analiz metodov energeticheskogo i kogerentnogo priema tsifrovykh informatsionnykh opticheskikh signalov. Ch. 1. Energeticheskiy priem [Comparative analysis of methods of energy and coherent reception of digital information optical signals. Part 1. Ener-gy reception], Tr. uchebnykh zavedeniy svyazi [Transactions of educational institutions of communica-tion], 2017, Vol. 3, No. 3, pp. 12-20.
2. Bylina M.S., Glagolev S.F., Dyubov A.S. Sravnitel'nyy analiz metodov energeticheskogo i kogerentnogo priema tsifrovykh informatsionnykh opticheskikh signalov. Ch. 2. Kogerentnyy priem [Comparative analysis of methods of energy and coherent reception of digital information optical signals. Part 2. Co-herent reception], Tr. uchebnykh zavedeniy svyazi [Transactions of educational institutions of communi-cation], 2017, Vol. 3, No. 4, pp. 21-28.
3. Makhmud Kh.A.M., Rumyantsev K.E. Formirovanie odnopolosnoy kvadraturnoy fazovoy manipulyatsii radiosignalov na podnesushchikh chastotakh v kogerentnoy opticheskoy sisteme kommunikatsii [For-mation of single-sideband quadrature phase-shift keying of radio signals at subcarrier frequencies in a coherent optical communication system], Izvestiya YuFU. Tekhnicheskie nauki [Izvestiya SFedU. Engi-neering Sciences], 2022, No. 5, pp. 209-220. DOI: 10.18522/2311-3103-2022-5-209-220.
4. Makhmud Kh.A.M., Rumyantsev K.E., Al'-Begat A.Kh.Sh. Analiz voskhodyashchego lazernogo kanala sputnikovoy kommunikatsii v usloviyakh atmosfernoy turbulentnosti [Analysis of the upward laser channel of satellite communication under atmospheric turbulence], Izvestiya YuFU. Tekhnicheskie nauki [Izvestiya SFedU. Engineering Sciences], 2023, No. 4, pp. 174-191. DOI: 10.18522/2311-3103-2023-4-174-191.
5. Sklyar Bernard. Tsifrovaya svyaz'. Teoreticheskie osnovy i prakticheskoe primenenie. Digital Commu-nications: Fundamentals and Applications [Digital Communications: Fundamentals and Applications]. 2nd ed. Moscow: Vil'yams, 2007, 1104 p. ISBN 0-13-084788-7.
6. Velichko M.A., Naniy O.E., Sus'yan A.A. Novye formaty modulyatsii v opticheskikh sistemakh svyazi [New modulation formats in optical communication systems], Lightwave Russian Edition, 2005,
No. 4, pp. 21-30.
7. Topchiy P.N., Elishev V.V., Rumyantsev D.V. Primenenie kvadraturnoy amplitudnoy manipulyatsii dlya povysheniya skorosti peredachi tsifrovoy informatsii [Application of quadrature amplitude shift keying to increase the digital information transmission rate], 79-ya nauchno-tekhnicheskaya konferentsiya Sankt-Peterburgskogo NTO RES im. A.S. Popova [79th scientific and technical conference of the St. Peters-burg Scientific and Technical Association of Radio Electronic Systems named after A.S. Popov], 2024, pp. 89-91.
8. Feer K. Besprovodnaya tsifrovaya svyaz'. Metody modulyatsii i rasshireniya spektra. Wireless Dig-ital Communications: Modulation and Spread Spectrum Applications [Wireless Digital Communications: Modulation and Spread Spectrum Applications]. Moscow: Radio i svyaz', 2000, 552 p. ISBN 5-256-01444-7.
9. Hui R., Zhu B., Huang R., Allen C., Demarest K. and Richards D. Subcarrier multiplexing for high-speed optical transmission, IEEE Journal of Lightwave Technology, 2002, Vol. 20, No. 3, pp. 417-427.
10. Makhmud Kh.A.M., Rumyantsev K.E. Spektral'nyy analiz sistemy peredachi s mul'tipleksirovaniem op-ticheskikh podnesushchikh, ispol'zuyushchey format modulyatsii QPSK [Spectral analysis of a trans-mission system with multiplexing of optical subcarriers using the QPSK modulation format], Funda-mental'nye i prikladnye aspekty komp'yuternykh tekhnologiy i informatsionnoy bezopasnosti: Mater. VII Vserossiyskoy nauchno-tekhnicheskoy konferentsii [Fundamental and applied aspects of computer tech-nology and information security: Proceedings of the VII All-Russian scientific and technical conference], 2021, pp. 77-81.
11. Makhmud Kh.A.M., Rumyantsev K.E. Modelirovanie mul'tipleksirovaniya podnesushchikh Naykvista dlya opticheskoy sistemy peredachi [Modeling of Nyquist subcarrier multiplexing for an optical trans-mission system], II Vserossiyskaya nauchno-prakticheskaya konferentsiya «Digital Era» [II All-Russian scientific and practical conference "Digital Era"], 2022, pp. 77-83.
12. Hui R., Zhu B., Huang R., Allen C., Demarest K., Richards D. 10-Gb/s SCM fiber system using optical SSB modulation, IEEE Photonics Technology Letters, 2001, Vol. 13, No. 8, pp. 896-898.
13. Afanas'ev V.M. Elektroopticheskiy modulyator po skheme interferometra Makha-TSendera [Electro-optical modulator based on the Mach-Zehnder interferometer scheme], Prikladnaya fotonika [Applied Photonics], 2016, Vol. 3, No. 4, pp. 341-344.
14. Drevko D.R., Zyuryukin Yu.A., Ushakov N.M. Modifikatsii elektroopticheskogo modulyatora Makha–Tsendera dlya upravleniya lazernym izlucheniem povyshennoy moshchnosti [Modifications of the Mach-Zehnder electro-optical modulator for controlling high-power laser radiation], Nanoelektronika, nanofotonika i nelineynaya fizika: Mater. V konferentsii molodykh uchenykh [Nanoelectronics, nanopho-tonics and nonlinear physics: Proceedings of the V conference of young scientists]. Saratov, 2010, pp. 18-19.
15. Voblikov E.D., Volyntsev A.B., Zhuravlev A.A., Kichanov A.V., Ponomarev R.S., Shevtsov D.I. Inte-gral'no-opticheskiy modulyator na osnove interferometra Makha–Tsendera s asimmetrichnoy topologiey volnovodov [Integrated optical modulator based on a Mach-Zehnder interferometer with an asymmetric waveguide topology], Tr. MAI [Trudy MAI], 2011, No. 46.
16. Ponomarev R.S., Voblikov E.D. Nekotorye voprosy raboty integral'no-opticheskikh modulyatorov inten-sivnosti [Some aspects of operation of integrated-optical intensity modulators], Vestnik Permskogo un-ta. Ser.: Fizika [Bulletin of Perm University. Series: Physics], 2011, Issue 2 (17), pp. 65-68.
17. Kuz'minov Yu.S. Elektroopticheskiy i nelineyno-opticheskiy kristall niobata litiya [Electro-optical and nonlinear-optical crystal of lithium niobate]. Moscow: Nauka, 1987, 264 p.
18. Zyuryukin Yu.A., Pavlova M.V., Drevko D.R. Volnovye uravneniya dlya opisaniya effekta Pokkel'sa v kristallakh i ikh analiz na primere kristalla niobata litiya [Wave equations for describing the Pockels ef-fect in crystals and their analysis using the example of a lithium niobate crystal], Izvestie vuzov. Priklad-naya nelineynaya dinamika [News of universities. Applied nonlinear dynamics], 2010, Vol. 8, No. 5, pp. 125-137.
19. Velichko M.A., Naniy O.E., Sus'yan A.A. Novye formaty modulyatsii v opticheskikh sistemakh svyazi [New modulation formats in optical communication systems], Lightwave Russian Edition, 2005,
No. 4, pp. 21-30.
20. Afanas'ev V.M. Elektroopticheskiy modulyator po skheme interferometra Makha–Tsendera [Electro-optical modulator based on the Mach-Zehnder interferometer scheme], Prikladnaya fotonika [Applied Photonics], 2016, Vol. 3, No. 4, pp. 341-369.
21. Mahmood H.A., Rumyantsev K.Y. Effect of FBG Compensated Dispersion on SCM/ASK Radio over Fiber System, 12th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI). IEEE, 2019, pp. 1-5.
22. Makhmud Kh.A.M., Rumyantsev K.E. Formirovanie odnopolosnoy kvadraturnoy fazovoy manipulyatsii radiosignalov na podnesushchikh chastotakh v kogerentnoy opticheskoy sisteme kommunikatsii [For-mation of single-sideband quadrature phase shift keying of radio signals at subcarrier frequencies in a coherent optical communication system], Izvestiya YuFU. Tekhnicheskie nauki [Izvestiya SFedU. Engi-neering Sciences], 2022, No. 5, pp. 209-220. DOI: 10.18522/2311-3103-2022-5-209-220.
