Title :
Code-division multiple-access encoding and decoding of femtosecond optical pulses over a 2.5-km fiber link
Author :
Chang, C.-C. ; Sardesai, H.P. ; Weiner, A.M.
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
We report for the first time proof-of-concept transmission experiments for femtosecond pulse code division multiple access (CDMA) operating over kilometer lengths of optical fiber in the 1.5-μm communication band. Our CDMA link consists of a femtosecond mode-locked Er-fiber laser and two chirped pulse fiber amplifiers, a pair of low-loss fiber-pigtailed pulse shapers for encoding and decoding, a 2.5-km dispersion-compensated transmission fiber, and an ultrafast nonlinear optical receiver. Our results demonstrate high fidelity transmission of spectrally encoded femtosecond pulses over 2.5 km of fiber, followed by the use of the nonlinear CDMA receiver to discriminate between correctly and incorrectly decoded signals with 20-dB contrast.
Keywords :
code division multiple access; decoding; encoding; high-speed optical techniques; optical fibre communication; optical fibre dispersion; optical receivers; 1.5 mum; 2.5 km; CDMA; CDMA link; chirped pulse fiber amplifiers; code-division multiple-access encoding; dB contrast; decoding; femtosecond mode-locked Er-fiber laser; femtosecond optical pulses; femtosecond pulse code division multiple access; high fidelity transmission; incorrectly decoded signals; kilometer lengths; km fiber link; low-loss fiber-pigtailed pulse shapers; nonlinear CDMA receiver; optical fiber communication band; spectrally encoded femtosecond pulses; time proof-of-concept transmission experiments; ultrafast nonlinear optical receiver; Decoding; Encoding; Multiaccess communication; Optical fiber communication; Optical fibers; Optical pulse shaping; Optical pulses; Optical receivers; Pulse amplifiers; Ultrafast optics;
Journal_Title :
Photonics Technology Letters, IEEE
