Reduction of interferometric optical crosstalk penalty via DC blocking

Marki, C.F.; Marki, Ferenc; Esener, Sadik C.

doi:10.1049/el:20070822

Cited by 17 publications

(5 citation statements)

References 9 publications

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“…Several techniques based on dithering [2], optimal filtering [4] and line coding [5] can increase the tolerance to reflections, moving the crosstalk tolerance level to around 18 dB [2 -5].…”

mentioning

confidence: 99%

Enhanced reflection tolerance in WDM-PON by chirped RZ modulation

et al. 2010

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confidence: 99%

Enhanced reflection tolerance in WDM-PON by chirped RZ modulation

et al. 2010

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“…We compare the resilience to the in-band interferometric crosstalk obtained for the RZ and for the NRZ modulation format at different wavelengths. We demonstrate the proposed scheme which may be a valid alternative to other similar schemes, already known [15]- [19]. On the other hand, we strongly believe that it would be particularly interesting, as it could be straightforwardly implemented, whenever the PON is chosen to use RZ signals, e.g., in [21].…”

Section: Introductionmentioning

confidence: 81%

“…Several techniques have been proposed to mitigate the effect of the in-band crosstalk in CLS PONs: in [15], a DC block was proposed to reduce the low-frequency beat noise generated during photodetection and in [16] the combined use of ad hoc line coding and postdetection filtering was exploited. As an alternative, it has been demonstrated that the in-band coherent crosstalk is effectively reduced by broadening the optical spectrum of the transmitted signals [5], [12], [17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Chirped RZ Signals in Reducing the Transmission Impairments in R-SOA-Based Bidirectional PONs

Banchi

Corsini

Presi

et al. 2011

J. Lightwave Technol.

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Distributed and concentrated reﬂections represent\ud the two main limitations in reﬂective-semiconductor optical ampliﬁer (R-SOA)-based passive optical networks (PONs). In this\ud paper, we experimentally discuss how the use of chirped signals\ud in centralized light seeding bidirectional PON can increase the\ud resilience of the system against those two types of reﬂections. An\ud experimental comparison of the performance of a highly chirped\ud return to zero (RZ) modulation format and the nonreturn to zero\ud is given. Error-free operation is achieved down to 10 dB of signal\ud to crosstalk ratio in presence of distributed reﬂection, when the\ud upstream signal is highly chirped RZ signal. The same chirped\ud modulation leads to a tolerance of more than dB network\ud return loss due to concentrated reﬂections. Finally, we assess also\ud the system feasibility of a R-SOA-based full-duplex PON where\ud both the upstream and the downstream are modulated signals

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“…To address MPI issue in IM-DD systems, proposed solutions include reducing the coherent length of optical carriers [8], constructing a high-pass filter [3], [9] and reconstructing the delayed signal [10]. Another approach is code division multiplexing (CDM) in which using orthogonal codewords to suppress unsynchronized paths whose phase shift are uncertain.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Coding and Filtering Technique for Optical IM-DD Link With Robustness to Multipath Interference and Bandwidth Limitation

et al. 2021

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In this work, a hybrid code division multiplexing (CDM) coding and digital filtering method for optical intensity modulation and direct detection (IM-DD) link is investigated to address multipath interference (MPI) and channel bandwidth limitation. CDM signaling already provides robustness to MPI through suppressing the unsynchronized paths by orthogonal (de)coding. As for digital filtering based on square root raised cosine (SRRC) waveforms, its advantage to IM-DD link includes robustness to channel bandwidth limitation due to pulse shaping. Additionally, matching filters achieve the best orthogonality only when they are synchronized well, thus robustness to MPI can be expected on the basis of CDM. We study the performance of such hybrid coding and filtering method over IM-DD link in the presence of MPI and bandwidth limitations through simulation. This is followed by experimental demonstrations of single pointto-point transmission with capacity at 112 Gbps. BER comparison between CDM only and hybrid filtering and coding method is performed by emulating MPI using a Mach-Zehnder interferometer. Furthermore, bidirectional transmission over a single fiber verifies its performance advantage and demonstrates potentials for reducing implementation costs of end-to-end optical communications.

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Reduction of interferometric optical crosstalk penalty via DC blocking

Cited by 17 publications

References 9 publications

Enhanced reflection tolerance in WDM-PON by chirped RZ modulation

Enhanced reflection tolerance in WDM-PON by chirped RZ modulation

Investigation of the Effects of Chirped RZ Signals in Reducing the Transmission Impairments in R-SOA-Based Bidirectional PONs

Hybrid Coding and Filtering Technique for Optical IM-DD Link With Robustness to Multipath Interference and Bandwidth Limitation

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