Colorless DQPSK Receiver for Wavelength Routed Packet-Switched Networks

Abstract

Abstract-We propose and demonstrate experimentally a scheme for the demodulation of 21.4-Gb/s return-to-zero differential quaternary phase-shift keying signals in packet-switched wavelength routed networks where packets at different wavelengths are arriving to the same demodulator. The idea is based on wavelength conversion, and in the demonstration, all channels were received error-free after wavelength conversion. In a packet arrival emulation, the ability of handling incoming packets at different wavelengths were successfully demonstrated.

Performance analysis of multiple optical orthogonal codes sequences–based optical labels for optical packet switching networks

“…For these requirements, to accommodate optical packet-based data traffic in WDM networks, the optical burst switching and the optical packet-switching (OPS) have been considered in the last several years. [4][5][6][7][8][9][10][11][12] The OPS has been investigated as a 0091-3286/2011/$25.00 C 2011 SPIE technique that enables the optical transport network (e.g., synchronous digital hierarchy and WDM) to accommodate the burst nature of IP traffic, and provides increased throughput and more efficient bandwidth utilization. 7 In addition, compared with electronic packet switching, the switching in an OPS system can be performed in all optical domain without any optoelectronic conversions.…”

“…Previously, some implementations of optical labels were proposed and some of them have also been demonstrated, such as wavelength division modulation (e.g., wavelength diversity label), 13 time division modulation (e.g., bit serial label), 14 frequency division modulation (e.g., sub-carrier label), 15 optical code division modulation [e.g., optical orthogonal code (OOC) label], [16][17][18][19] and orthogonal modulation (e.g., amplitude shift keying, frequency shift keying, and differential phase-shift keying.) 5,9 Among these techniques of optical label schemes, as an alternative scheme, optical codes-based optical label technique is attracted widely, owing to its advantages, such as no required clock extraction, low latency, and all-optical processing. However, considering thousands of addresses (namely optical labels) in OPS networks, the limited number of OOCs for optical labels with the given code length and weight is not practical for use of optical labels that one OOC assigns only one address.…”