Modal Gain Controllable 2-LP-Mode Fiber Amplifier Using PLC Type Coupler and Long-Period Grating

Author

Wada, Masaki ; Sakamoto, Takanori ; Mori, Takayoshi ; Yamamoto, Takayuki ; Hanzawa, Nobutomo ; Yamamoto, Fumihiko

Author_Institution

NTT Access Network Service Syst. Labs., NTT Corp., Tsukuba, Japan

Volume

32

Issue

24

fYear

2014

fDate

Dec.15, 15 2014

Firstpage

4694

Lastpage

4700

Abstract

We propose a 2-LP-mode erbium-doped fiber amplifier (EDFA) with a planar lightwave circuit (PLC) type coupler and a long-period grating (LPG) for controlling mode dependent gain (MDG). We successfully fabricated a PLC that combines C-band light and 980-nm pump light with a low insertion loss of less than 1.8 dB for a signal over the C-band, and less than 1.5 dB for a 980-nm pump light. Finally, we realized experimentally an adaptive MDG control from -1.5 to +1.4 dB within the C-band by pump mode conversion using an LPG without affecting the crosstalk and noise figure characteristics of the EDFA.

Keywords

adaptive control; diffraction gratings; erbium; optical control; optical fabrication; optical fibre amplifiers; optical fibre couplers; optical fibre losses; optical pumping; C-band light; PLC type coupler; adaptive mode dependent gain control; erbium-doped fiber amplifier; long-period grating; low insertion loss; modal gain controllable two-LP-mode EDFA; optical fabrication; planar lightwave circuit; pump light; wavelength 980 nm; Couplers; Couplings; Erbium-doped fiber amplifiers; Gain; Insertion loss; Optical fiber amplifiers; Optical fiber couplers; Few-mode fiber; Multimode amplifier; few-mode fiber; long period grating; mode division multiplexing; multimode amplifier;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2014.2361675

Filename

6924757