Journal of the Korea Society of Computer and Information (한국컴퓨터정보학회논문지)

Korean Society of Computer Information (한국컴퓨터정보학회)
권호 표지
DOI QR코드

DOI QR Code

Improvement of Received Optical Power Sensitivity in Asymmetric 2.5Gbps/1.2Gbps Passive Optical Network with Inverse Return to Zero(RZ) coded Downstream and NRZ upstream re-modulation

역 RZ 부호로 코딩된 하향신호의 재변조를 이용한 비대칭 2.5Gbps/622Mbps 수동 광가입자 망에서의 수신 감도의 개선

  • 박상조 (서원대학교 정보통신공학과)
  • Received : 2010.01.12
  • Accepted : 2010.02.22
  • Published : 2010.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

We propose the asymmetric 2.5Gbps/622Mbps PON(Passive Optical Network) in order to reduce the bandwith of filter at receiver with inverse RZ(Return to Zero) code coded downstream and NRZ(Non Return to Zero) upstream re-modulation. I theoretically analyze BER(Bit Error Rate) performance and the power sensitivity with the optimal threshold level by performing simulation with MATLAB according to the types of downstream data. The results have shown that the optimal threshold level at the optical receiver could be saturated at 0.33 as the optical received power increase more than -26dBm to keep $10^{-12}$ of BER to a minimum. Also the power sensitivity is more improved by about 3dB by fixing the threshold level at 0.33 than the conventional receiver. The proposed system can be a useful technology for optical access networks with asymmetric upstream and downstream data rates because the optical receiver can be used without controlling threshold levels and that does not require a light source in optical network unit (ONU) and its control circuits in the optical line termination (OLT).

역 RZ 부호로 코딩된 하향신호의 재변조를 이용하여 수신단에서 필터의 대역폭을 줄이기 위하여 상향신호가 저속인 비대칭 2.5Gbps/622Mbps 수동 광가입자 망을 제안한다. 하향 데이터의 형태에 따른 재변조한 상향신호의 평균오차율을 이론적으로 분석하고, 매트랩을 이용한 시뮬레이션을 통하여 최적 임계치에 의한 수신감도를 분석한다. 수신신호의 평균오차율을 $10^{-12}$미만으로 얻기 위해서는 수신전력이 약 -26dBm 이상 요구되며, 임계치의 최적치는 0.33으로 설정이가능하여 임계치가 0.5인 종래의 수신기를 사용하는 경우보다 수신감도가약 3dB 개선되는 것을 알 수 있다. 제안 시스템은 임계치의 제어가 불필요하고, 광 네트워크 유니트에서 광원 및 광선로 단국장치에서 제어회로를 제거할 수 있어, 비대칭 쌍방향 데이터 전송에 유용한 방식임을 알 수 있다.

Keywords

References

  1. ITU-T Recommendation G.983.1,Broadband optical access systems based on PON, Oct. 1998.
  2. M D. Prycker, W. Verbiest and D. Mestdagh, "ATM passive optical networks: preparing the access network for BISDN," Proc. of ISS, pp.380-384, Oct. 1992.
  3. T. Pfeiffer, B. Deppisch, M. Kaiser and R. Heidemann, "High speed optical network for asynchronous multiuser access applying periodic spectral coding of broadband sources," Electronics Letters, vol.33, no.25, pp.2141-2142, Dec. 1997. https://doi.org/10.1049/el:19971463
  4. N. J. Frigo, P. P. Iannone, P. D. Magill, T. E. Darcie, M. M. Downs, B. N. Desai, U. Koren, T. L. Koch, C. Dragone, H. M. Presby, and G. E. Bodeep, "A wavelength-division multiplexed passive optical network with cost-shared component," IEEE Photon. Technol. Lett., vol. 6, no. 11, pp.1365-1367, Nov. 1994. https://doi.org/10.1109/68.334841
  5. S. Narikawa, H. Sanjoh, N. Sakurai, and K. Kumozaki, "Gbit-class transmission using SOA data rewriter for WDM-PON," IEICE Trans. Commun., vol.E91-B, no. 2, pp.399-408, Feb. 2008. https://doi.org/10.1093/ietcom/e91-b.2.399
  6. W. Hung, C. K. Chan, L. K. Chen, and T. Tong, "An optical network unit for WDM access networks with downstream DPSK and upstream re-modulated OOK date using injection-locked FP laser," in Proc. Opt. Fiber Commun. (OFC2003), Atlanta, GA, USA, Paper TuR2.
  7. J. Prat, V. Polo, C. Bock, C. Arellano, and J. J. V. Olmos, "Full-duplex single fiber transmission using FSK downstream and IM remote upstream modulators for fiber-to-the-home," IEEE Photon. Technol. Lett., vol. 17, no. 3, pp.702-704, Mar. 2005. https://doi.org/10.1109/LPT.2004.840930
  8. O. Akanbi, J. Yu, and G.-K. Chang, "A new scheme for bidirectional WDM-PON using upstream and downstream channels generated by optical carrier suppression and separation technique," IEEE Photon. Technol. Lett., vol. 18, no. 2, pp.340-342, Jan. 2006. https://doi.org/10.1109/LPT.2005.861975
  9. J. Zhang, N. Chi, P. V. Holm-Nielsen, C. Peucheret, and P. Jeppesen, "Method for high-speed Manchester encoded optical signal," in Proc. Opt. Fiber Commun. (OFC2004), Los Angeles, CA, USA, Paper MF76.
  10. B. K. Kim, H. Park, S. Park, and K. Kim, "Optical access network scheme with downstream Manchester coding and upstream NRZ re-modulation," Electron. Lett., vol.42, no.8 , pp.484-485, Apr. 2006. https://doi.org/10.1049/el:20060246
  11. B. Kim, S. J. Park, et. al, "Performance Enhancement by threshold level control of a receiver in WDM-PON system with Manchester coded downstream and NRZ upstream re-modulation," IEICE(Institute of Electronics, Information and Communication Engineers) Trans. on Commun.E91-B pp2994-2997, Sept, 2008.
  12. 박상조, 김봉규, "맨체스터 부호로 코딩된 하향신호의 재변조를 이용한 비동기 2.5Gbps/622Mbps 광가입자망의 성능분석", 한국광학회지, 제20권, 제3호, 143-147쪽, 2009년 6월. https://doi.org/10.3807/HKH.2009.20.3.143
  13. H. Chung, B. K. Kim and K. Kim, "Effects of upstream bit rate on a wavelenhth-remodulated WDM-PON based Manchester or inverse-return-tozero coding," ETRI Journal vol.30, no.2 , pp.255-260, Apr. 2008. https://doi.org/10.4218/etrij.08.1107.0032
  14. S. J. Park and B. Kim,"Performance Analysis for Optimizing Threshold Level Control of a Receiver in Asynchronous 2.5 Gbps/1.2 Gbps Optical Subscriber Network with Inverse Return to Zero(RZ) coded Downstream and NRZ upstream re-modulation," Journal of the Optical Society Korea(JOSK), vol.13, no.3, pp361-366, Sept, 2009. https://doi.org/10.3807/JOSK.2009.13.3.361
  15. G. P. Agrawal, "Fiber-Optic Communication Systems," 2nd ed., (John Wiley & Sons, Inc., 1997), pp. 170-173.
  16. J. G. Proakis and M. Salehi, "Contemporary communication systems using MATLAB," Thomson learning, 1998.