Crosstalk penalty in all-optical distributed switching networks

Buckman, L.A.; Chen, L.P.; Lau, Kam Y.

doi:10.1109/68.553109

Cited by 14 publications

(9 citation statements)

References 6 publications

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“…The calculations performed by Buckman are also included for the cases of Gaussian and numerically determined distributions for incoherent crosstalk characteristics. It is evident from figure 6 that the level of crosstalk which may be accomodated is significantly higher for incoherent forms of crosstalk (Goldstein et al, 1994;Buckman et al, 1997;Yang & Yao, 1996;Jeong & Goodman, 1996;). Switch extinction ratio is related to crosstalk at the circuit level.…”

Section: Crosstalkmentioning

confidence: 96%

“…While the approach can be a useful guide for low channel counts, this can lead to overestimated power penalty at high channel counts (Buckman et al, 1997) due to statistical averaging (see for example Section 2.1). Nonetheless extinction ratios achieved for SOA gates are commonly reported in the 40dB range (Larsen & Gustavsson, 1997;Varazza et al, 2004, Tanaka et al, 2009.…”

Section: Crosstalkmentioning

confidence: 99%

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Photonic Integrated Semiconductor Optical Amplifier Switch Circuits

Williams

2011

Advances in Optical Amplifiers

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Section: Crosstalkmentioning

confidence: 96%

Section: Crosstalkmentioning

confidence: 99%

Photonic Integrated Semiconductor Optical Amplifier Switch Circuits

Williams

2011

Advances in Optical Amplifiers

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“…Crosstalk between optical packet channels, one of the problems associated with transparency, should be investigated both to understand its constraint on the optical components and to guide the design of OPN nodes. Considerable efforts have been devoted to analyzing and suppressing crosstalk in traditional circuit-switched optical networks [7][8][9][10][11][12]. According to whether it occupies the same nominal wavelength of the signal or not, crosstalk in optical networks is generally classified into two types, namely, homowavelength crosstalk (HOC) and heterowavelength crosstalk (HEC) [13].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of homowavelength crosstalk in optical packet networks

Zhang

et al. 2003

Micro & Optical Tech Letters

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In this paper, homowavelength crosstalk in optical packet networks is evaluated with the following aspects taken into consideration: device crosstalk coefficient, signal extinction ratio, traffic load,The evolution of packet switching in the optical domain has naturally evolved to address transport-sporadic and bursty IP traffic more efficiently. With advantages such as high speed, data-rate and format transparency, and flexibility, optical packet switching has recently become a popular research topic worldwide [1][2][3][4][5][6]. However, transparency places a stringent constraint on optical components so that the signal quality will not significantly degrade. Crosstalk between optical packet channels, one of the problems associated with transparency, should be investigated both to understand its constraint on the optical components and to guide the design of OPN nodes. Considerable efforts have been devoted to analyzing and suppressing crosstalk in traditional circuit-switched optical networks [7][8][9][10][11][12]. According to whether it occupies the same nominal wavelength of the signal or not, crosstalk in optical networks is generally classified into two types, namely, homowavelength crosstalk (HOC) and heterowavelength crosstalk (HEC) [13]. HEC is not a serious problem, since it can be removed easily by employing filters. On the other hand, HOC, because it occupies the same wavelength of the signal, cannot be removed once coupled and accumulates through the cascade. Thus, HOC potentially poses a serious limitation to the performance of optical packet networks (OPNs). To our knowledge, very few researchers have addressed this issue; therefore, we made a detailed analysis of the HOC in OPNs.By considering device crosstalk coefficient, signal extinction ratio, traffic load, node size, and cascadability, the effect of HOC on the performance of OPN nodes is analyzed in detail. In the following section, a brief introduction of crosstalk in OPNs is made, and then bit error rate and packet error rate arising from HOC are analytically computed. To show the significance of the HOC-induced performance degradation in OPNs, the influence of HOC is evaluated with examples of practical network nodes. In section 3, numerical results are presented with discussions, and conclusions are drawn in section 4. THEORY Crosstalk in OPN NodesIn OPNs, the packet length in the optical domain can be fixed or variable. However, in practical applications, packets with fixed duration are generally adopted, mapped into fixed timeslots, and scheduled in a slotted fashion to simplify the implementation of the nodes. In the input interface of the OPN node, during each timeslot all packets are aligned in phase and separated by demultiplexers according to their wavelengths. Then they are delivered to corresponding output ports, according to their address information by the switch matrix. In the output interface, contention resolution and packet header regeneration are generally performed [1].At the OPN nodes, the components of nonid...

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“…The result of these additional signals at the receiver is a beat noise. Past works investigated the eOE ect of this noise and the power penalty that it introduces, including the eOE ect of modulation index, [1,2]. However in these papers the beat noise statistics are considered gaussian, which is not the case [3].…”

mentioning

confidence: 95%

Impact of Modulation Index on Homodyne Crosstalk in Optically Switched Networks

Boimovich¹,

Rubin²,

Sadot³

2001

Fiber and Integrated Optics

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The impact of imperfect modulation depth on crosstalk induced penalty in optical switched systems is theoretically and experimentally investigated. A nonlinear relationship with a clear``knee' ' is observed, indicating an optimum modulation index of 8 dB.Homodyne crosstalk exists when at the input of an optical receiver, in addition to a desired signal, there is also one or many other signals of the same wavelength. This can be the result of insu cient isolation between channels in optical switches or the presence of internal re¯ections of the desired signal within the system. The result of these additional signals at the receiver is a beat noise. Past works investigated the eOE ect of this noise and the power penalty that it introduces, including the eOE ect of modulation index, [1,2]. However in these papers the beat noise statistics are considered gaussian, which is not the case [3]. Gaussian approximation of this noise in calculating BER and penalties has proven to be inaccurate [3± 5]. More accurate models provide better results [4± 5]. This paper covers the case of a single interfering signal and the in¯uence of the extinction ratio on the penalty caused by the beat noise. The new treatment provides better results when compared to former works. TheoryThe modulated laser electrical ® eld is de® ned by E 1 …t †ˆD 1 …t † cos …! 0 t ‡ 1 …t † †; …1 †

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Crosstalk penalty in all-optical distributed switching networks

Cited by 14 publications

References 6 publications

Photonic Integrated Semiconductor Optical Amplifier Switch Circuits

Photonic Integrated Semiconductor Optical Amplifier Switch Circuits

Performance analysis of homowavelength crosstalk in optical packet networks

Impact of Modulation Index on Homodyne Crosstalk in Optically Switched Networks

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