64 and 128 coherent QAM optical transmission over 150 km using frequency-stabilized laser and heterodyne PLL detection.
We describe 1 Gsymbol/s, 64 and 128 coherent quadrature amplitude modulation (QAM) transmissions over 150 km, in which we employ a frequency-stabilized C(2)H(2) fiber laser, an optical phase-looked loop (OPLL), and a heterodyne detection circuit.
Yoshida
Masato
M
Research Institute of Electrical Communication, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai-shi, Miyagi-ken, 980-8577 Japan. masato@riec.tohoku.ac.jp
Goto
Hiroki
H
Kasai
Keisuke
K
Nakazawa
Masataka
M
D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D008872:Microwaves