Protection Scheme for a Wavelength-Division-Multiplexed Passive Optical Network Based on Reconfigurable Optical Amplifiers

This paper demonstrates a wavelength-division-multiplexed passive optical network (WDM-PON) scheme based on novel reconfigurable optical amplifiers (ROAs). The measured switching characteristics of the ROA3 constructed with a 2 × 2 crossbar optical switch and a four-port reversible optical circulator (OC) and a conventional EDFA can meet the requirements of most network management and surveillance. The self-made four-port reversible OC’s response time is less than 2 ms, and its insertion losses are about 1 dB or less for all the transmission paths and switching states. An optimal design of ROAs is proposed and evaluated for bidirectional optical amplifier protection, in which ROA3 has an EDF length of 7.5 m long with a 1480 nm pump laser and possesses a backward or forward pumping configuration with the corresponding pump power of 200 mW or 50 mW. We verified the scheme’s feasibility through a simulation of WDM-PON systems with 40 downstream and upstream channels. This scheme enables the intelligent protection switching in practical operation scenarios for high-capacity multi-wavelength networks.

Design of L-Band Multiwavelength Laser for TDM/WDM PON Application

This paper presents on the design of L-Band Multiwavelength laser for Hybrid Time Division Multiplexing/ Wavelength Division Multiplexing (TDM/WDM) Passive Optical Network (PON) application. In this design, an L-band Mulltiwavelength Laser is designed as the downstream signals for TDM/WDM PON. The downstream signals ranging from 1569.865 nm to 1581.973 nm with 100GHz spacing. The multiwavelength laser is designed using OptiSystem software and it is integrated into a TDM/WDM PON that is also designed using OptiSystem simulation software. By adapting multiwavelength fiber laser into a TDM/WDM network, a simple and low-cost downstream signal is proposed. From the simulation design, it is found that the proposed design is suitable to be used in TDM/WDM PON for up to 64 Optical Network Units (ONUs).

Hibrīdo FBG sensoru un WDM-PON šķiedru optisko sistēmu izstrāde un novērtējums

Attīstoties šķiedru optikas datu pārraides tehnoloģijām un infrastruktūrai globālā mērogā, sensoru funkciju veikšanai arvien aktuālāka kļūst šķiedru optisko sensoru lietošana, galvenokārt tādu priekšrocību dēļ kā mazs izmērs, viegls svars, multipleksēšanas iespējas un citas. Līdz ar to, lai nodrošinātu efektīvāku optisko sensoru tehnoloģiju lietojumu, ir jāizpēta un jāmeklē jauni risinājumi šķiedru optisko sensoru integrēšanai un izmantošanai esošajā un arī nākotnes šķiedru optisko sakaru sistēmu arhitektūrā. Promocijas darba galvenais mērķis ir ar teorētiskiem un eksperimentāliem pētījumiem veikt vienotā sistēmā realizētu FBG šķiedru optisko sensoru tīklu un WDM-PON metro piekļuves pārraides sistēmu kopdarbības izpēti un novērtējumu. Lai novērtētu to veiktspēju vienotā sistēmā, ir veikta detalizēta FBG optisko sensoru tīkla un šķiedru optiskās datu pārraides sistēmas kopdarbības izpēte, realizējot matemātisko modelēšanu un eksperimentālu šādu sistēmu izstrādi.

Efficient solution for WDM-PON with low value of BER using NRZ modulation

This paper focused on the novel design of receiver side of wavelength division multiplexing passive optical network (WDM-PON). It serves the need for a dramatic change in demand for high data rate beyond 10 gigabits per second (Gbps) at the last mile for a larger coverage area or distance. This increase in demand for higher bandwidth is due to the emerging future technologies like Internet of things (IoT), silicon on chip (SoC), cloud computing, machine learning (ML), and artificial intelligence (AI). Simulation results demonstrated for the different coverage areas which compare the bit error rate (BER), quality (Q)-Factor, and eye height as per the guidelines of ITU-T. It has been predicted that the proposed WDM-PON design supports up to a distance of 60 km. Results have been verified for 40 km, 50 km, 60 km, and 70 km, respectively, at 100 GHz frequency spacing with acceptable BER and better quality (Q)-factor as defined by ITU.