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Innovation application: Combined Erbium and Ytterbium-Doped Fiber Amplifier

Title Combined Erbium and Ytterbium-Doped Fiber Amplifier
Abstract

With the increasing volume of transmitted data per channel, it is necessary to have greater optical capacities; therefore, in the process of optimizing the multichannel communication system, one faces two basic issues: bandwidth and input power increase. Respectively, power reserves shall be provided, as, for maintenance of a bit stream, the transmitter should be given a more powerful signal, in other words – the signal must be amplified. Combining erbium (EDF) and ytterbium (YDF) doped fibers enable higher optical amplifier output powers, because thanks to larger cross-section area, ytterbium ions absorb the maximum amount of the exciting source power.

Keywords combined optical amplifiers, rare-earth-doped optical fibers, C and L optical spectral band
Authors Ingrīda Lavrinoviča
Andis Supe
Jurģis Poriņš
Department (13100) Telekomunikāciju institūts
Statistical Classification of Economic Activities, NACE 2 Telecommunications
Other professional, scientific and technical activities
Description of the technology

Combined erbium and ytterbium-doped fiber amplifier is realized using continuous-wave laser (CW) with distributed feedback as a primary source, which initiates energy flow to the pumping supply. The 980 nm pump laser is firstly set for forward pumping and then for backward pumping configuration. The length of doped fiber segments is chosen by optimization process. Preliminary spectral measurements should be performed with different doped fiber samples until an active excitation of both erbium and ytterbium ions is observed. By measuring gain coefficient and noise factor for variable pump power values, one can evaluate the amplification process of optical signals in multiple spectral bands.

 

Fig.1. Experimental setup of a combined erbium-ytterbium doped fiber amplifier. 

Applications Using the combined solution with erbium and ytterbium fiber segments connected in a row, it is possible to expand erbium amplification band from the standard 47 nm to 82 nm, thus covering wavelength division multiplexing communication system’s C (1530–1565 nm) and L (1565–1625 nm) wavelength bands. The expanded spectral band may be practically used as the exciting source pumping wavelength for further combined amplifier’s study.
Advantages

Using counter-propagating pumping configuration at the wavelength of 980 nm ensures a power saving of 2 dB since the highest gain coefficient corresponds to the minimal excitation source power. 

Technology Readiness Level Actual system proven in operational environment
Partnership offer • Service contracts. • Cooperation and research projects.
Publications
ID 160
Contact information Linda Šufriča, e-mail: inovacijas@rtu.lv; phone.: 28442736