Faisal İbrahim Mohamed IBRAHIM, SAİT ESER KARLIK

THE COMBINED IMPACT OF SRS AND FWM PHENOMENA ON THE DOWNLINK CHANNEL PERFORMANCE OF DWDM-GPON SYSTEMS

In this paper the combined impact of stimulated Raman scattering (SRS) and four-wave mixing (FWM) on the downlink channel performance of dense wavelength division multiplexed-gigabit passive optical networks (DWDM-GPONs) has been compared with the single impact of FWM via signal-tocrosstalk ratio (SXR) simulations performed on center downlink channels of 7-, 15- and 31-channel DWDM-GPON systems. Simulation results show that SRS compensates negative impacts of FWM and compensation significance enhances with increasing channel numbers and channel spacing values. At high channel spacing values of 50 GHz and 100 GHz, variation of SXR can display a strong oscillatory behavior in very short channel length variations of 0.5 km. The combined impact of SRS and FWM enhances the maximum oscillation amplitude of SXR variation with respect to the single impact of FWM at those channel spacing values. It has been observed that Raman gain exhibits an approximately linear variation with channel input powers in 0.1-5 mW range and it increases with increasing fiber lengths, channel spacing values and channel numbers. Results of this research emphasize the significant difference between the combined impact of SRS and FWM and the single impact of FWM on DWDM-GPON systems and give important hints for current DWDM-GPON implementations.

SRS ve FWM Olaylarının DWDM-GPON Sistemlerin Aşağı Yönlü Kanal Performansları Üzerindeki Birleşik Etkisi

Bu makalede, 7-, 15- ve 31-kanallı yoğun dalgaboyu bölmeli çoğullamalı gigabit pasif optik ağ (DWDM-GPON) sistemlerinin merkez aşağı yönlü kanalları üzerinde gerçekleştirilen işaret-çapraz karışım oranı (SXR) benzetimleri yardımıyla, uyarılmış Raman saçılması (SRS) ve dört dalga karışımının (FWM), DWDM-GPON aşağı yönlü kanal performansları üzerindeki birleşik etkisi, FWM’nin tekli etkisi ile karşılaştırılmıştır. Benzetim sonuçları, SRS’nin FWM’nin negatif etkilerini kompanze ettiğini ve kompanzasyon belirginliğinin artan kanal sayıları ve kanallar arası boşluk değerleri ile arttığını göstermektedir. 50 GHz ve 100 GHz gibi yüksek kanallar arası boşluk değerlerinde, SXR değişimi, 0.5 km’lik çok kısa kanal uzunluğu değişimlerinde güçlü bir osilasyon davranışı sergilemektedir. Bu kanallar arası boşluk değerlerinde, SRS ve FWM birleşik etkisi, SXR değişimindeki maksimum osilasyon genliğini FWM’nin tekli etkisine göre daha da arttırmaktadır. 0.1-5 mW aralığında, Raman kazancının kanal giriş güçleri ile yaklaşık olarak doğrusal değişim sergilediği gözlenmiştir ve Raman kazancı artan fiber uzunlukları, kanallar arası boşluk değerleri ve kanal sayıları ile artmaktadır. Bu çalışmanın sonuçları, DWDM-GPON sistemler üzerindeki SRS ve FWM birleşik etkisi ile FWM tekli etkisi arasındaki belirgin farkı vurgulamakta ve mevcut DWDM-GPON uygulamaları için önemli ipuçları vermektedir.

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