Spectral phase encoding of ultra-short optical pulse in time domain for OCDMA application

Wang, Xu; Wada, Naoya

doi:10.1364/oe.15.007319

Cited by 58 publications

(35 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous solutions are based on amplitude-only filtering (Dai & Yao, 2008), amplitude and phase filtering (Petropoulos et al, 2001;Weiner, 1995;Azaña et al, 2003), or phase-only filtering (Azaña et al, 2005;Wang & Wada, 2007;Weiner et al, 1993). In term of power efficiency phase filtering is preferred since the energy is totally preserved with respect to amplitude only or amplitude and phase filtering where some spectral components are attenuated or canceled.…”

Section: Programmable All-fiber Optical Pulse Shapermentioning

confidence: 99%

“…The very interesting fiber-based solution for programmable pulse shaping proposed in (Azaña et al, 2005) and used in (Wang & Wada, 2007) is based on time-domain optical www.intechopen.com phase-only filtering. This method originates from the most famous technique for programmable optical pulse shaping, based on spatial-frequency mapping (Weiner et al, 1993).…”

Section: Programmable All-fiber Optical Pulse Shapermentioning

confidence: 99%

“…Therefore the pursuit of an integrated (fiber) pulse shaping solution, including full compatibility with waveguide/fiber devices, which can be able to provide the additional functionality of electronic programmability, manifests to be useful for a lot of different application fields. For this reason a programmable fiber-based phase-only spectral filtering setup has been recently introduced (Azaña et al, 2005;Wang & Wada, 2007). In the next section the working principle of this spectral phase-only linear filtering approach is discussed and an improvement of the solution reported in (Azaña et al, 2005) is presented and widely investigated.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Programmable All-Fiber Optical Pulse Shaping

Malacarne¹,

Thomas²,

Fresi³

et al. 2010

Frontiers in Guided Wave Optics and Optoelectronics

View full text Add to dashboard Cite

Section: Programmable All-fiber Optical Pulse Shapermentioning

confidence: 99%

Section: Programmable All-fiber Optical Pulse Shapermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Programmable All-Fiber Optical Pulse Shaping

Malacarne¹,

Thomas²,

Fresi³

et al. 2010

Frontiers in Guided Wave Optics and Optoelectronics

View full text Add to dashboard Cite

“…A different code that specifies the phase shifts is assigned to each user, requiring the application of the complementary code at the receiver to recover the original information. Several proposals have been made based on this technique using different technologies, such as volume optics [2], arrayed waveguide gratings [3], or fiber-dispersive elements [4,5].…”

mentioning

confidence: 99%

“…As in other dispersion-based systems [4,5], incorporating the codes with an electro-optic modulator enables their rapid reconfiguration. However, unlike with other techniques, the use of the self-imaging effect allows the individual line-by-line coding of the transmitted signal, making possible the simultaneous transmission of WDM and OCDMA signals within the same optical fiber.…”

mentioning

confidence: 99%

WDM compatible and electrically tunable SPE-OCDMA system based on the temporal self-imaging effect

et al. 2011

View full text Add to dashboard Cite

A coding/decoding setup for a spectral phase encoding optical code-division multiple access (SPE-OCDMA) system has been developed. The proposal is based on the temporal self-imaging effect and the use of an easily tunable electrooptic phase modulator to achieve line-by-line coding of the transmitted signal, thus assuring compatibility with WDM techniques. Modulation of the code is performed at the same rate as the data, avoiding the use of high-bandwidth electro-optic modulators. As proof of concept of the technique, experimental results are presented for a back-to-back coder/decoder setup transmitting a 10 GHz unmodulated optical pulse train within an 80 GHz optical window and using 8- Another major goal in OCDMA systems is to attain spectral efficiency by reducing the bandwidth transmitted to a certain spectral window and thus guarantee compatibility with WDM systems. To achieve this, reduction of the bandwidth occupied by the transmitted signal is mandatory, and it can be obtained by reducing the spectral width of the different frequency bins so that each one contains only one spectral line. This way, each chip of the code word is associated to an individual spectral line of the incoming pulses and is obtained by employing a line-by-line modulation scheme [6]. Some proposals addressing this objective have been made based on diverse high-resolution filtering techniques, such as microring resonators [7] or volume optics [8].In this Letter, a scheme for an SPE-OCDMA system based on the use of the temporal self-imaging effect on fiber [9] is presented. As in other dispersion-based systems [4,5], incorporating the codes with an electro-optic modulator enables their rapid reconfiguration. However, unlike with other techniques, the use of the self-imaging effect allows the individual line-by-line coding of the transmitted signal, making possible the simultaneous transmission of WDM and OCDMA signals within the same optical fiber. Furthermore, the speed at which the code is imposed using the modulator is the same as the data rate, avoiding the use of high-bandwidth modulators.The proposed setup for the network can be seen in Fig. 1. A star coupler is used to interconnect the different users, where an optical circulator separates the transmitted signal (upper branch) from the received signal (lower branch). To clarify the working principle of the coder, a schematic illustration of the signals and their time-frequency representations at different points of the transmitter (labeled from A to D in Fig. 1.) is presented in Fig. 2.A pulsed source is used to generate a train of ultrashort optical pulses at a fixed repetition rate T 0 . Data are modulated at this rate to the train in an on-off keying scheme with an intensity modulator, obtaining at its output the train of pulses shown in Fig. 2(A). The resulting signal is passed through a linearly chirped fiber Bragg Fig. 1. OCDMA network scheme for the proposed setup with K users. The upper branch of user I (green) corresponds to the transmitter and the lower branch (red) t...

show abstract