Title :
All-optical gain control of in-line erbium-doped fiber amplifiers for hybrid analog/digital WDM systems
Author :
Dai, Hongxing ; Pan, Jin-Yi ; Lin, Chinlon
Author_Institution :
Bellcore, Red Bank, NJ, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
Automatic gain control using an all-optical feedback loop in in-line erbium-doped fiber amplifiers (EDFA´s) used in hybrid analog/digital wavelength division multiplexing (WDM) systems was studied. It is found that the signal level variation for the digital channels can be maintained within a range /spl les/3-dB between the presence and dropout of the analog channel when the narrowband feedback is centered at the amplified spontaneous emission (ASE) peak (/spl sim/1532 nm) with loop loss ranging between 13-22 dB. Robust transmission at 2.5 Gb/s without measurable power penalty was obtained for the digital channels when the EDFA was saturated by either the analog or the control lasing signal.
Keywords :
automatic gain control; erbium; fibre lasers; laser feedback; multiplexing equipment; optical fibre losses; optical fibre networks; optical variables control; superradiance; telecommunication channels; telecommunication control; visual communication; wavelength division multiplexing; 13 to 22 dB; 1532 nm; 2.5 Gbit/s; ASE peak; EDFA; all-optical feedback loop; all-optical gain control; amplified spontaneous emission; automatic gain control; control lasing signal; digital channels; hybrid analog/digital WDM systems; in-line erbium-doped fiber amplifiers; loop loss; narrowband feedback; power penalty; robust transmission; signal level variation; video trunking; Baseband; Erbium-doped fiber amplifier; Feedback loop; Gain control; Narrowband; Optical fiber cables; Optical fibers; Optical transmitters; Quadrature amplitude modulation; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
