Ukrainian Journal of Physical Optics 
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Influence length of single-beam propagation in doped glass and polymer optical fibres 
1Maryam Karimi, 2Faramarz E. Seraji

1Physics Group, Razi University, Kermanshah, Iran
2Optical Communication Group, Iran Telecom Research Center, 14399 Tehran, Iran

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For characterisation of doped optical fibres (DOFs) based on single-beam propaga-tion, one requires a maximum DOF length along which a signal power can propagate. In this work we have solved the rate equation for the single-beam propagation in both lossy and lossless DOFs, introduced an influence length as a maximum propagation length and then determined it analytically. With the analytical results obtained, the main regularities for the influence length have been simulated for the glass optical fibres doped with Ge/Al/Er operating at arbitrary wavelengths under lossless and lossy conditions. Also, the influence length has been determined for some kinds of co-dopants present in both polymer and glass optical fibres. The influence length thus defined may be useful in any measurements based on the single-beam propagation in DOFs.

Keywords: influence length, doped optical fibres, single-beam propagation, fibre lasers and amplifiers

PACS: 42.81._i, 42.25.Bs; 42.79._e; 42.65.Yj, 42.55.Wd
UDC: 535.3
Ukr. J. Phys. Opt. 11 90 - 98   doi: 10.3116/16091833/11/2/90/2010
Received: 14.01.2010

Анотація. Умовою охарактеризування легованих оптичних однопроменевих волокон (ЛОВ) є забезпечення їх максимальної довжини вздовж якої поширюється сигнал. В даній роботі ми розв’язали рівняння для поширення променя у ЛОВ з втратами та без них, ввівши ефективну довжину, як максимальну довжину поширення, яка потім визначалась аналітично. На основі аналітично отриманих результатів були промодельовані основні закономірності ефективної довжини для скляних оптичних волокон, легованих Ge/Al/Er, які функціонували на різних довжинах хвиль, за умови наявності і відсутності втрат. Крім цього, ефективна довжина була визначена для полімерних і скляних волокон з певним типом домішок. Таким чином, продемонстровано, що ефективна довжина може бути корисною при однопроменевих вимірюваннях у ЛОВ.
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