Optoelectronic feedback in audio signal transmission

Author

Li, Jinzhu ; Ikeda, Hiroaki ; Matsubara, Yuh-Ichi ; Tsuchiya, Etsuo ; Yoshida, Hirofumi ; Nishimura, Ken-ichi ; Shinohara, Shigenobu

Author_Institution

Shizuoka Univ., Hamamatsu, Japan

fYear

1991

fDate

11-14 Jun 1991

Firstpage

2577

Abstract

A new type of optoelectronic feedback system was built to simultaneously transmit the PFM (pulse frequency modulation) audio-signal from a sender to one or more receivers. In the sender, the PFM audio-signal generated by using a VCO (voltage-controlled oscillator) is converted into the optical signal by an optical transmitter and the optical transmitter output is also fed back to the VCO input through an optical receiver installed in the sender. The optoelectronic feedback is thus established to compensate for the nonlinearity of the VCO, to reduce the distortion of the received signal, and to improve the dynamic range of the PFM modulator. This new PFM system has a distortion factor of as low as 0.5% with a dynamic range of as wide as 2.0 V_p-p

Keywords

audio signals; feedback; optical communication equipment; optical links; pulse frequency modulation; variable-frequency oscillators; audio signal transmission; compensation; nonlinearity; optical communication; optical receiver; optical signal; optical transmitter; optoelectronic feedback; pulse frequency modulation; voltage-controlled oscillator; Dynamic range; Frequency modulation; Optical distortion; Optical feedback; Optical pulses; Optical receivers; Optical transmitters; Pulse modulation; Signal generators; Voltage-controlled oscillators;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1991., IEEE International Sympoisum on

Print_ISBN

0-7803-0050-5

Type

conf

DOI

10.1109/ISCAS.1991.176072

Filename

176072