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Innovation application: Multichannel Light Source for Optical WDM-PON Communication Systems

Title Multichannel Light Source for Optical WDM-PON Communication Systems

As the number of end-users increases, it is necessary to increase the number of light emitting sources. Therefore, in the optical access networks which are characterized by the tree type branching topology very promising are light sources, which allow generating multiple wavelengths at the same time, each of them further used for data transmission. Accordingly the number of active components in the transmission system is decreasing and its reliability is improving. The aim of developed technology is to reduce the number of light sources (lasers or light diodes) used in the transmitter part of wavelength division multiplexed passive optical network (WDM-PON), at the same time not reducing the number of channels used for data transmission. To increase the efficiency of each light source and provide the possibility to use single light source for more than one data signal transmission, the WDM-PON access system with multichannel light source is offered, which is established by using fiber optical parametric amplifier (FOPA) with two pump light sources and highly nonlinear optical fiber (HNLF). Such a solution allows amplifying the power of initial lasers light, at the same time doubling the number of transmission channels.

Keywords fiber optical transmission systems, WDM, PON, HNLF
Authors Sandis Spolītis
Vjačeslavs Bobrovs
Ģirts Ivanovs
Sergejs Olonkins
Department (13100) Telekomunikāciju institūts
Statistical Classification of Economic Activities, NACE 2 Telecommunications
Scientific research and development
Description of the technology

In traditional WDM-PON transmission system architecture, one optical source is required to produce a single channel carrier. It is not the most cost-effective solution, as, by increasing the number of transmission channels, the number of required light sources increases accordingly. Therefore, it is important to ensure a higher number of signal carriers using fewer optical sources. FOPAs during the process of parametric amplification generate idler spectral components, which are actually phase conjugated copies of the amplified signal. These idlers could be used not only for wavelength conversion or 2R and 3R signal regeneration, but also for increasing the number of carriers on the transmitter side of a WDM transmission system.

Therefore, a model of a dual-pump FOPA has been developed for doubling the number of existing carriers in a WDM transmission system. To test the operation of this model, a simulation model of a 32-channel WDM transmission system has been created with 10 Gbit/s transmission speed per channel, 100 GHz channel spacing and NRZ-OOK modulation format. Simulation model of this system is shown in Fig. 1.

Fig. 1. Simulation model of the 32-channel 10 Gbit/s WDM transmission system with the provided multicarrier (multichannel) source solution, which is based on wavelength conversion using a dual-pump FOPA.

The main feature in the simulation model, which is presented in Fig. 1, is that the FOPA is located before the transmitter block, or at the 32-channel modulator inputs. The optical multicarrier source consists of continuous radiation lasers (CW1–CW16), an optical attenuator, two powerful pumping sources, two optical splitters and a 500 meter long HNLF fiber.

Applications Technology can be used for generation on multiple wavelengths at the same time, which are further used for data transmission in WDM-PON system, and accordingly reducing the number of active components in it and improving the reliability.

This solution reduce the number of light sources (lasers or light diodes) used in the transmitter part of WDM-PON system, at the same time without reducing number of channels used for data transmission and doubling the number of carriers in this communication system.

Technology Readiness Level Experimental proof of concept
Partnership offer • Contract on the system design. • Licence contract. • Commercial contracts. • Contracts of collaboration.
ID 40
Contact information Linda Šufriča, e-mail: inovacijas@rtu.lv; phone.: 28442736