Subcarrier multiplexing and ATM/SONET clear-channel transmission in a reconfigurable multiwavelength all-optical network test bed

Multiwavelength reconfigurable WDM/ATM/SONET network testbed

“…NETWORK APPLICATIONS Clear channel transmission, i.e., transmission on dedicated optical paths without requiring electrical regeneration, of sub-carrier multiplexed analog and digital modulated signals in alloptical networks [16] offers the advantages of high capacity, low cost, and readily available upgradability of video and data services. One of the applications demonstrated in our reconfigurable network testbed was the distribution of analog video and binary phase shifted keying (BPSK) data signals co-propagated with interactive miultimedia digital services transported on ATMEONET over 150 Km of single mode fiber and a cascade of six EDFA's and five WDM crossconnects [3], [24], [25]. We were thus able to demonstrate the transparency of the network to both analog and digital signals.…”

“…30 [3], [24], [25]. Four VCR's at access node D supplying analog video were used to simulate satellite down linked microwave video channels with a standard spacing of 30 MHz/each in the FM domain.…”

“…Three of the wavelength channels are modulated at the SONET OC-3 rate and carry both data and control signals between the access nodes. The remaining wavelength (1554 nm) is used to carry four subcarrier multiplexed analog video channels [ 3 ] , [24], [25]. Subcarrier multiplexed (SCM) transmitters and receivers are installed in various access nodes as shown in Fig.…”