Spectrally Efficient Six-User Coherent OCDMA System Using Reconfigurable Integrated Ring Resonator Circuits

Agarwal, Anjali; Toliver, P.; Menendez, R.; Banwell, T.; Jackel, J.; Etemad, S.

doi:10.1109/lpt.2006.882323

Cited by 19 publications

(12 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Finally, recently another method using reconfigurable integrated ring resonator circuits was introduced by Agrawal et al [91]. In this approach the ultrashort light pulse is passed through a filter bank based on microring resonators and after appropriate phase shifts by thermo-optic phase heaters, the outputs of different branches are combined together.…”

Section: A1 Enabling Technologies For Spectral Phase Encoder-decodermentioning

confidence: 99%

Emerging OCDMA communication systems and data networks [Invited]

Salehi

2007

J. Opt. Netw.

View full text Add to dashboard Cite

I present an in-depth review of the trends and the directions taken by researchers worldwide in optical code-division multiple-access (OCDMA) systems. I highlight those trends and features that I believe are essential to the successful introduction of various OCDMA techniques in communication systems and data networks in the near future. In particular I begin by giving a comprehensive review of the construction of optical orthogonal codes (OOCs). Specifically I discuss the recently developed algorithms that are based on matrix algebra, which simplify and enhance the efficiencies of algorithms in OOC generation. In communication systems studies I first focus on and discuss various OCDMA techniques, such as incoherent and coherent OCDMA. A comprehensive discussion takes place on all important aspects of each OCDMA technique. In particular, I elaborate on enabling technologies that are needed prior to full scale consideration of OCDMA in communication systems. For incoherent OCDMA the technique is categorized into two distinguished techniques, namely, 1D and 2D OCDMA. For each technique I discuss the various receiver structures proposed to date. In particular I discuss a recently introduced powerful receiver structure based on optical AND logic gate elements. Based on this receiver structure I conclude that in many practical applications, OOCs with a cross-correlation value equal to 2 or 3, which have a much larger cardinality compared to OOCs with = 1, perform much better. Many fundamental issues, including architectural consideration of multiple amplifiers, various acquisition algorithms, and advanced signaling methods, such as pulse position modulation, are discussed. For coherent OCDMA or spectrally encoded ultrashort light pulse OCDMA, I begin by having an indepth discussion on the key and enabling technologies that are essential in the successful implementation of this very important and extremely powerful technique. In particular on the encoder-decoder side I present discussions on various key device technologies such as virtually imaged pulsed array, fiber Bragg gratings, and arrayed waveguide gratings. On the receiver side I elaborate on various nonlinear detection schemes used in such OCDMA networks. I will present an analytical framework on the above nonlinear detection schemes and discuss their pros and cons. I extend the discussion to various data networks. In particular I will discuss applications such as wireless OCDMA LAN, free-space OCDMA, fiber-to-the-home, and other code-divisionmultiple-access-based packet communication networks using label addressing and processing techniques to indicate the directions and the applications for which OCDMA systems are considered. It is believed that in the not so distant future OCDMA, once fully developed and matured, will be an inseparable part of advanced optical communication systems and networks, due to its various desirable features and functionalities. clever encoding and decoding mechanisms that are essential for future all-optical communication systems an...

show abstract

Section: A1 Enabling Technologies For Spectral Phase Encoder-decodermentioning

confidence: 99%

Emerging OCDMA communication systems and data networks [Invited]

Salehi

2007

J. Opt. Netw.

View full text Add to dashboard Cite

show abstract

“…However, for practical applications, there are several issues to overcome, including low spectral efficiency, large multiuser access interference (MAI) as well as others. Spectrally phase coded OCDMA has been studied in detail [4][5][6][7] and attempts have been made to overcome these problems. In spectrally phase coded OCDMA, a mode-locked laser produces phaselocked spectral lines, evenly spaced with the pulse repetition rate.…”

Section: Introductionmentioning

confidence: 99%

“…The random phase coding disturbs the phaselocked feature and spreads the pulse in time, converting the input short pulses into noise like, low intensity signals. In a receiver, the same coder is used to recover the original phase, and the noise-like signal is converted back to the original pulse signal, while waveforms from other users (i.e., MAI noise) which use different codes retain phasedisturbed, low-intensity, noise-like waveforms, which are very similar to the coded signals [4][5][6][7]. This means that decoding of a random phase coded waveform simply returns to a random coded waveform set unless the decoding is matched to the pulse.…”

Section: Introductionmentioning

confidence: 99%

“…The probability of the signal overlap at the above NB-OCDMA receiver can be reduced up to 1/5, whereas the spectral efficiency can increase up to 4 times, compared with those of a BB-OCDMA. Recently, Etemad et al studied this NB-OCDMA, where 16 spectral lines within the 80 GHz bandwidth were coded for 4×2.5 Gb/s and 6×5 Gb/s OCDMA systems, and they achieved spectral efficiencies of 0.125 bit/Hz and 0.375 bit/Hz respectively [6,7]. However, the relatively good efficiency of 0.375 bit/s in [7] was achieved by an additional polarization multiplexing, which reduces the significance of the value to half (0.1875 bit/s).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Etemad et al studied this NB-OCDMA, where 16 spectral lines within the 80 GHz bandwidth were coded for 4×2.5 Gb/s and 6×5 Gb/s OCDMA systems, and they achieved spectral efficiencies of 0.125 bit/Hz and 0.375 bit/Hz respectively [6,7]. However, the relatively good efficiency of 0.375 bit/s in [7] was achieved by an additional polarization multiplexing, which reduces the significance of the value to half (0.1875 bit/s). Further improvement of the spectral efficiency can be achieved by reducing the number of spectral lines while increasing the speed of each OCDMA channel, and by multiplexing with a signal which has other modulation formats.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Spectrally Phase Coded Waveform Discrimination at 10 GHz for Narrow Band Optical CDMA within 100 GHz Spectral Window

Seo¹,

Supradeepa²

2010

Journal of the Optical Society of Korea

View full text Add to dashboard Cite

We demonstrate binary spectral phase coded waveform discrimination at 10 GHz for narrow band optical code-division multiple-access (NB-OCDMA) via direct electrical detection without using any optical hard-limiter. Only 9 phase-locked, 10 GHz spaced, spectral lines within a 100 GHz spectral window are used for the phase coding. Considerably high contrast ratio of 5 between signal and multiuser access interference noise can be achieved for 4 × 10 G pulse/sec timing coordinated OCDMA at a simple electrical receiver with 50 GHz bandwidth.

show abstract

Multichannel Systems

Agrawal¹

2010

Fiber‐Optic Communication Systems

View full text Add to dashboard Cite

Spectrally Efficient Six-User Coherent OCDMA System Using Reconfigurable Integrated Ring Resonator Circuits

Cited by 19 publications

References 11 publications

Emerging OCDMA communication systems and data networks [Invited]

Emerging OCDMA communication systems and data networks [Invited]

Spectrally Phase Coded Waveform Discrimination at 10 GHz for Narrow Band Optical CDMA within 100 GHz Spectral Window

Multichannel Systems

Contact Info

Product

Resources

About