Twin fiber grating tunable dispersion compensator

Fells, Julian A. J.; Kanellopoulos, S.E.; Bennett, P.J.; Baker, V.; Priddle, H.F.M.; Lee, W.S.; Collar, A.J.; Rogers, Chris; Goodchild, D.; Feced, R.; Pugh, B.; Clements, S.J.; Hadjifotiou, A.

doi:10.1109/68.942668

Cited by 16 publications

(6 citation statements)

References 9 publications

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“…The slope penalty may be eliminated through the use of a grating pair. In such a TDC the light must reflect off of both gratings and the dispersion slope is cancelled [33]. As the two gratings are tuned, the dispersion changes, but the slope remains zero.…”

Section: Other Fiber Grating Tunable Dispersion Compensatorsmentioning

confidence: 98%

Fiber-based tunable dispersion compensation

Litchinitser¹,

Sumetsky²,

Westbrook³

2007

J Optic Comm Rep

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Abstract. Tunable dispersion has been implemented in various technology platforms, including fiber gratings, planar waveguides, thin film etalons, and bulk optic technologies. This paper will focus on fiber grating based tunable dispersion compensation, because fiber gratings are at present one of the best developed TDC technologies available. The paper is divided into three parts. In the first part we describe grating based TDC technologies and discuss their advantages and disadvantages. We focus on thermally tuned linearly chirped fiber gratings, as these have to date been the most successful grating technology for 40 Gbit/s. We also compare grating TDCs to two other prominent tunable dispersion technologies: thin film etalons and planar waveguide ring resonators. In the second section we describe the techniques used to fabricate high performance dispersion compensation gratings as well as the theory of the primary defect of fiber grating dispersion compensation: group delay ripple (GDR). In the third section we describe the telecom system related issues for tunable gratings, including characterization of grating performance, tunability requirements and results from actual system trials using tunable FBGs.

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Section: Other Fiber Grating Tunable Dispersion Compensatorsmentioning

confidence: 98%

Fiber-based tunable dispersion compensation

Litchinitser¹,

Sumetsky²,

Westbrook³

2007

J Optic Comm Rep

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“…Once a multi-stage filter module with enough stages to achieve acceptable bandwidth and dispersion flatness, multiple units of this basic module can be combined to get higher dispersion values. Figure 12(d) [129] illustrates passing an optical signal through two multi-stage filter modules implemented in Gires-Tournois etalons, consisting of a resonant cavity operating in reflection, with a high rear mirror reflectivity and a low front mirror reflectivity.…”

Section: All-pass Filter Devicesmentioning

confidence: 99%

“…In 2003, a group from JDS Uniphase published a series of papers on tunable etalon compensators that were based on the two-element technique previously implemented by Fells et al in tunable chirped gratings [129]. In this technique, the frequency separation between a pair of etalon modules, designed with opposite signs of dispersion slope within the optical channel, is thermally tuned to achieve variable amounts of total dispersion.…”

Section: All-pass Filter Devicesmentioning

confidence: 99%

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Survey of systems experiments demonstrating dispersion compensation technologies

Garrett¹

2006

J Optic Comm Rep

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Chromatic dispersion compensation is an integral part of WDM transmission system design. Compensator properties such as insertion loss, dispersion slope and effective mode area have a large impact on WDM system performance due to nonlinear optical propagation effects. Dispersion compensator imperfections, such as multi-path interference, group delay ripple, insertion loss ripple and limited per-channel compensation bandwidth, place additional limitations on the achievable transmission distance and capacity. In this paper, a survey of key WDM transmission system experiments is undertaken to 1) review the development of chromatic dispersion compensation technologies, 2) discuss the device characteristics that most impact system design for each technology, and 3) hopefully enable the reader to better evaluate compensator technologies for specific applications.

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“…Currently a number of schemes have been proposed to compensate for chromatic dispersion utilizing a single FBG [6] or two nonlinearly chirped FBG used in tandem to mitigate third order dispersion effects [7]- [9]. Various monitoring techniques have been demonstrated such as adding a subcarrier tone to the transmitted data signal [10] or employing nonlinear detection of optical pulse distortions [11].…”

mentioning

confidence: 99%

Chromatic Dispersion Monitoring for High-Speed WDM Systems Using Two-Photon Absorption in a Semiconductor Microcavity

Bondarczuk¹,

Maguire²,

Reid³

et al. 2009

IEEE J. Quantum Electron.

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Abstract-This paper presents a theoretical and experimental investigation into the use of a two-photon absorption (TPA) photodetector for use in chromatic dispersion (CD) monitoring in highspeed, WDM network. In order to overcome the inefficiency associated with the nonlinear optical-to-electrical TPA process, a microcavity structure is employed. An interesting feature of such a solution is the fact that the microcavity enhances only a narrow wavelength range determined by device design and angle at which the signal enters the device. Thus, a single device can be used to monitor a number of different wavelength channels without the need for additional external filters. When using a nonlinear photodetector, the photocurrent generated for Gaussian pulses is inversely related to the pulsewidth. However, when using a microcavity structure, the cavity bandwidth also needs to be considered, as does the shape of the optical pulses incident on the device. Simulation results are presented for a variety of cavity bandwidths, pulse shapes and durations, and spacing between adjacent wavelength channels. These results are verified experimental using a microcavity with a bandwidth of 260 GHz (2.1 nm) at normal incident angle, with the incident signal comprising of two wavelength channels separated by 1.25 THz (10 nm), each operating at an aggregate data rate of 160 Gb/s. The results demonstrate the applicability of the presented technique to monitor accumulated dispersion fluctuations in a range of 3 ps/nm for 160 Gb/s RZ data channel.

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Twin fiber grating tunable dispersion compensator

Cited by 16 publications

References 9 publications

Fiber-based tunable dispersion compensation

Fiber-based tunable dispersion compensation

Survey of systems experiments demonstrating dispersion compensation technologies

Chromatic Dispersion Monitoring for High-Speed WDM Systems Using Two-Photon Absorption in a Semiconductor Microcavity

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