Raman Crosstalk Suppression in CATV Overlay Passive Optical Network

In cable television (CATV) overlay passive optical networks (PONs), where a CATV signal copropagates with a downstream baseband signal, the crosstalk components mediated by stimulated Raman scattering (SRS) limit the performance of low-number CATV channels. In this letter, we propose and demonstrate a way of reducing the SRS-induced crosstalk in CATV overlay PONs. The proposed scheme utilizes a high-speed polarization scrambler in the transmitter to make the SRS-induced crosstalk independent of polarization evolution along the fiber and a subtractor module to compensate for the crosstalk. Our demonstration shows that crosstalk can be reduced by 9 dB

[1]  Rongqing Hui,et al.  Raman crosstalk in fiber-optic hybrid CATV systems with wide channel separations , 2004, IEEE Photonics Technology Letters.

[2]  F. Coppinger,et al.  RF video overlay in an Ethernet passive optical network , 2006, 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference.

[3]  F. Coppinger,et al.  Nonlinear Raman crosstalk in a 125-Mb/s CWDM overlay on a 1310-nm video access network , 2004, Optical Fiber Communication Conference, 2004. OFC 2004.

[4]  B. Colella,et al.  Raman crosstalk in video overlay passive optical networks , 2004, Optical Fiber Communication Conference, 2004. OFC 2004.

[5]  Feng Tian,et al.  Raman crosstalk control in passive optical networks , 2006, 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference.

[6]  F. Coppinger,et al.  Nonlinear Raman cross-talk in a video overlay passive optical network , 2003, OFC 2003 Optical Fiber Communications Conference, 2003..

[7]  M.R. Phillips,et al.  Crosstalk due to optical fiber nonlinearity in WDM CATV lightwave systems , 1999, OFC/IOOC . Technical Digest. Optical Fiber Communication Conference, 1999, and the International Conference on Integrated Optics and Optical Fiber Communication.

[8]  H. Kim,et al.  Performance limitation of hybrid WDM systems due to stimulated Raman scattering , 2001, IEEE Photonics Technology Letters.