Czasopismo | PRZEGLĄD ELEKTROTECHNICZNY | Rocznik 2023 - zeszyt 8

Enhanced Mitigation of Nonlinearity Signal Distortion by Hybrid Optical Compensation Technique

Udoskonalone łagodzenie zniekształceń sygnału nieliniowości dzięki hybrydowej technice kompensacji optycznej

10.15199/48.2023.08.41

nr katalogowy: 144448
10.15199/48.2023.08.41

Streszczenie

This work investigates and proposes a method for mitigating the negative effects of nonlinearities in the fiber with dense wave division multiplexing transmission systems by combining the optical phase conjugation (OPC) approach with a Raman amplifier. The OPC technique uses a polarization diversity loop configuration to suppress the original input signal. As a result, phase conjugated idlers can be generated across a wide frequency range without introducing any spectral inefficiencies due to wavelength shifts. Idle waves are created by mixing four waves in nonlinear fibers with pump waves that are out of band and orthogonally polarized. Finally, the OPC subsystem is put to use in transmission experiments spanning 800 km over dispersion managed fiber spans with lumped amplification by Improved Raman amplifiers to reduce the effects of fiber nonlinearity caused by mid-link spectrum inversion or multiple links. Simulated results of a 50 GHz channel spacing and a 1.792 Tbps made up of eight 224 Gbps polarization division multiplexed (PDM) sixteen ary quadrature amplitude modulation (DP-16QAM) subchannels reveals a Q-factor improvement of up to ~3 dB in mid OPC compared to ~3.37 dB in multiple OPC in the absence of a backward Raman amplifier. In addition, using the OPC would result in an approximate of 10-6 improvement in BER compared to the conventional method. Furthermore, the average enhancement in error vector magnitude (EVM) for the DWDM situation would be larger than 15% with the inclusion of hybrid OPC with backward Raman amplifier

Abstract

Ta praca bada i proponuje metodę łagodzenia negatywnych skutków nieliniowości we włóknie za pomocą systemów transmisyjnych z multipleksowaniem z gęstym podziałem fali poprzez połączenie podejścia optycznej koniugacji fazy (OPC) ze wzmacniaczem Ramana. Technika OPC wykorzystuje konfigurację pętli różnorodności polaryzacji do tłumienia oryginalnego sygnału wejściowego. W rezultacie sprzężone fazowo koła pasowe mogą być generowane w szerokim zakresie częstotliwości bez wprowadzania jakichkolwiek nieefektywności widmowych z powodu przesunięć długości fali. Fale jałowe są tworzone przez zmieszanie czterech fal we włóknach nieliniowych z falami pompy, które są poza pasmem i spolaryzowane ortogonalnie. Wreszcie, podsystem OPC jest wykorzystywany w eksperymentach z transmisją na dystansie 800 km na światłowodach zarządzanych dyspersyjnie ze wzmocnieniem skupionym przez ulepszone wzmacniacze ramanowskie w celu zmniejszenia skutków nieliniowości światłowodów spowodowanej odwróceniem widma łącza środkowego lub wieloma łączami. Symulowane wyniki odstępu międzykanałowego 50 GHz i przepustowości 1,792 Tb/s składającej się z ośmiu 224 Gb/s zmultipleksowanych z podziałem polaryzacji (PDM) szesnastu podkanałów kwadraturowej modulacji amplitudy (DP-16QAM) ujawniają poprawę współczynnika Q do ~3 dB w średnim OPC w porównaniu do ~ 3,37 dB w wielu OPC przy braku wstecznego wzmacniacza Ramana. Ponadto użycie OPC spowodowałoby poprawę BER w przybliżeniu o 10-6 w porównaniu z metodą konwencjonalną. Co więcej, średnie zwiększenie wielkości wektora błędu (EVM) dla sytuacji DWDM byłoby większe niż 15% przy uwzględnieniu hybrydowego OPC z wstecznym wzmacniaczem ramanowskim.

Słowa kluczowe

Keywords

Bibliografia

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