Experimental Study on Time-Spread/Wavelength-Hop Optical Code Division Multiplexing With Group Delay Compensating En/Decoder

Abstract

10-Gb/s time-spread/wavelength-hop optical code generation and decoding were performed by group delay compensating fiber Bragg grating (FBG) en/decoder pair. A 10-km single-mode fiber (SMF) transmission of 10-Gb/s optical code division multiplexing (OCDM) was experimentally demonstrated. Index Terms-Optical code division multiple access (CDMA), optical fiber communications, optical fiber devices, optical networks.

Real-Time Dispersion Code Multiple Access for High-Speed Wireless Communications

“…Another reason for this choice is the fact that Chebyschev phasers have recently become available, in non-uniform transmissionline C-section technology [32]. Note that the dispersion codes used in optical multiple access are typically stair-case group delay functions [9]- [11]. However, these functions involve broad idle frequency guard bands between adjacent group delay stairs, due to the sinc-type frequency slicing by Bragg grating fibers, which represents a waste of spectral resources that is unaffordable at RF in addition to extra constraints on the phasers design.…”

“…A purely analog IP frequency hopping multiple access has been exclusively used in optics so far. This analog technique consists in rearranging the spectral contents of signals in time, using dispersion controlled devices such as Bragg fiber gratings [8], so as to encode ultra-short pulses according to a dispersive time-frequency mapping scheme [9]- [11]. The purely analog nature of this technique attractively Lianfeng leads to real-time processing, and hence low signal latency and high-speed transmission.…”

Performance analysis of incoherent multi-wavelength OCDMA systems under the impact of four-wave mixing

“…In order to focus on the impact of FWM, the group velocity dispersion (GVD), self-phase mixing, and cross-phase mixing on the system performance is neglected in the analysis. The discussion on the impact of GVD on 2-D OCDMA systems can be found in [11], and as a matter of fact, GVD can be effectively compensated by using DSF or GVD compensation techniques [12,22]. In the following analysis, we assume that the bit and chip streams from all users are to be synchronized, i.e., the worst performance since the FWM-induced power is the strongest in this case.…”

Beat noise cancellation in 2-D OCDMA systems using Optical Hard-limiter Array

“…time skewing) between optical pulses on difference wavelengths will happen, which causes the misalignment between desired pulses [11]. Therefore, we apply post-skewing technique to the tunable delay components so that time skewing effect is compensated [12].…”