Z. Ghassemlooy et al., OPTICAL-FIBER TRANSMISSION OF A BROAD-BAND SUBCARRIER MULTIPLEXED SIGNAL USING PTM TECHNIQUES, IEEE transactions on consumer electronics, 42(2), 1996, pp. 229-238
Subcarrier multiplexing (SCM) is an attractive multiplexing technique
to deliver broadband services over optical fibres. The majority of exi
sting systems employ an analogue signal for optical transmission and t
herefore the performance of these systems are limited. This paper prop
oses to improve SCM system performance by converting the analogue SCM
signal into a pulse time modulated signal for optical transmission. Th
e pulse time modulation techniques investigated are pulse frequency mo
dulation and square wave frequency modulation. System measurements and
theoretical predictions were obtained and they are in close agreement
. We have improved the dynamic range and optical power budget consider
ably, compared to conventional systems.