Free spectral range optimization of return-to-zero differential phase shift keyed demodulation in the presence of chromatic dispersion

Lize, Y.K.; Christen, L.; Wu, Xiaoxia; Yang, Jeng-Yuan; Nuccio, Scott; Wu, Teng; Willner, Alan E.; Kashyap, Raman

doi:10.1364/oe.15.006817

Cited by 25 publications

(19 citation statements)

References 14 publications

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“…This can be attributed to the difference in the sampling phase chosen in the two methods. In [10] it has been shown that due to the deterministic interference between consecutive symbols in the S-MZDI, the output is close to an inverted return-to-zero (RZ) signal. Because the realtime MLSE is optimized for NRZ-OOK modulation, it samples the signal in a different part of the symbol period resulting in our setup in a non optimal back-to-back performance, as explained in Fig.…”

Section: Real-time Experimental Resultsmentioning

confidence: 99%

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A 10.7-Gb/s DPSK Receiver with 4000-ps/nm Dispersion Tolerance using a Shortened MZDI and 4-state MLSE

Alfiad

Borne

Napoli

et al. 2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract: We experimentally demonstrate a 10.7-Gb/s NRZ-DPSK receiver with 4000-ps/nm chromatic dispersion tolerance by using phase demodulation with a half-bit delay in combination with a simple 4-state maximum likelihood sequence estimation (MLSE) equalizer.

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Section: Real-time Experimental Resultsmentioning

confidence: 99%

“…In this paper we present a simpler approach that results in a larger CD tolerance. We show that the use of a Mach-Zehnder delay interferometer (MZDI) with a <1-bit delay [8][9][10], together with MLSE, results in a ~4000 ps/nm CD tolerance for 10.7-Gb/s NRZ-DPSK modulation. Fig.…”

Section: Introductionmentioning

confidence: 99%

A 10.7-Gb/s DPSK Receiver with 4000-ps/nm Dispersion Tolerance using a Shortened MZDI and 4-state MLSE

Alfiad

Borne

Napoli

et al. 2008

OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference

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“…In [24] and [25], it has been shown that using an MZDI with a delay of less that between both arms for demodulating the DPSK signal can considerably enhance the CD tolerance. In [12] and [13], we extended this concept by applying an MLSE to the balanced output of the S-MZDI, and showed that this can enable a CD tolerance of up to 4000 ps/nm at 2-dB OSNR penalty.…”

Section: Conventional Mlse Combined With An S-mzdimentioning

confidence: 99%

Maximum-Likelihood Sequence Estimation for Optical Phase-Shift Keyed Modulation Formats

Alfiad

Borne²,

Hauske³

et al. 2009

J. Lightwave Technol.

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract-Electronic chromatic dispersion compensation employing maximum-likelihood sequence estimation (MLSE) has recently been the topic of extensive research and a range of commercial products. It is well known that MLSE provides a considerable benefit for amplitude modulated modulation formats such as ON-OFF keying (OOK) and optical duobinary. However, when applied to optical phase modulation formats, such as differential phase-shift keying (DPSK) and differential quadrature phase-shift keying (DQPSK), it has been shown that the benefit is only marginal. This paper investigates joint-decision MLSE (JD-MLSE) detection applied to 10.7-Gb/s DPSK. It demonstrates that a JD-MLSE using the constructive and destructive components preserves the 3-dB optical signal-to-noise ratio (OSNR) advantage of DPSK over OOK in dispersion-limited optical systems. Furthermore, we demonstrate that the use of a shortened MZDI with MLSE for the 10.7-Gb/s DPSK modulation can equalize an accumulated chromatic dispersion of 4000 ps/nm. In addition, we discuss in this paper different MLSE schemes applied to 2 10.7-Gb/s DQPSK modulation. It is shown that a joint-symbol MLSE (JS-MLSE) on the balanced outputs of the in-phase and quadrature components gives the best performance.Index Terms-Differential phase-shift keying (DPSK), differential quadrature phase-shift keying (DQPSK), joint-decision MLSE (JD-MLSE), Mach-Zehnder delay interferometer (MZDI), maximum-likelihood sequence estimation (MLSE).

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“…The effects noted for NRZ-DPSK in [2], particularly with no dispersion, have a different origin to those reported here and were in fact caused primarily by the NRZ signal being partially converted to RZ. In another paper, [3], the effects of dispersion and PMD on RZ-DPSK were investigated with partial delay demodulation of the signal. In [3] a limited (12.5%) increase in dispersion tolerance was shown, in this paper we show that further optimization can lead to up to a 100% increase in dispersion tolerance.…”

Section: Introductionmentioning

confidence: 99%

“…In another paper, [3], the effects of dispersion and PMD on RZ-DPSK were investigated with partial delay demodulation of the signal. In [3] a limited (12.5%) increase in dispersion tolerance was shown, in this paper we show that further optimization can lead to up to a 100% increase in dispersion tolerance. In particular we find that to gain the full benefit from partial DPSK it is essential to use the correct filter bandwidth, and that this bandwidth is narrower than the typical values used elsewhere.…”

Section: Introductionmentioning

confidence: 99%

An RZ DPSK receiver design with significantly improved dispersion tolerance

Govan¹,

Doran²

2007

Opt. Express

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Abstract:We show an improved DPSK receiver design which can increase useful dispersion tolerance by up to a factor of two. The increased dispersion tolerance is achieved through optimization of the optical filter at the receiver and the delay of the Mach-Zehnder interferometer. In this paper we fully explain the concept, quantify the gain and provide an explanation for the operation of the receiver.

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Free spectral range optimization of return-to-zero differential phase shift keyed demodulation in the presence of chromatic dispersion

Cited by 25 publications

References 14 publications

A 10.7-Gb/s DPSK Receiver with 4000-ps/nm Dispersion Tolerance using a Shortened MZDI and 4-state MLSE

A 10.7-Gb/s DPSK Receiver with 4000-ps/nm Dispersion Tolerance using a Shortened MZDI and 4-state MLSE

Maximum-Likelihood Sequence Estimation for Optical Phase-Shift Keyed Modulation Formats

An RZ DPSK receiver design with significantly improved dispersion tolerance

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