Influence of Cavity Lifetime on High-Finesse Microcavity Two-Photon Absorption Photodetectors

Abstract-The influence of the limited acceptance angle of a high-finesse microcavity two-photon absorption photodetector on its response has been investigated. It is shown that the limited acceptance angle of the microcavity explains the observed asymmetry seen in the spectral dependence of the microcavity. The theory describing the influence of the acceptance angle allows for an optimum incident beam waist for any cavity structure to be calculated, with an optimum spot diameter of 7 m having been calculated for the microcavity under test. The theory also enables the calculation of an optimum incident spot size for any microcavity. It is shown that a cavity with higher overall reflectivity require larger input spot sizes in order to optimize the level of generated two-photon absorption.

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“…The exponential term in (2) describes the propagation of the signal through a fiber length with a group velocity dispersion . The cavity field transform function can be approximated by [21] (3)…”

Section: Theoretical Model Describing Tpa Based Chromatic Dispersmentioning

confidence: 99%

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

Bondarczuk

¹

,

Maguire

²

,

Reid

³

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.

show abstract

“…The exponential term in (2) describes the propagation of the signal through a fiber length with a group velocity dispersion . The cavity field transform function can be approximated by [21] …”

Section: Theoretical Model Describing Tpa Based Chromatic Dispersmentioning

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.

Self Cite

7

0

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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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Influence of Cavity Lifetime on High-Finesse Microcavity Two-Photon Absorption Photodetectors

Cited by 5 publications

References 9 publications

Acceptance Angle Influence on the Optimum Incident Spot Size for High-Finesse Microcavity Two-Photon Absorption Photodetectors

Acceptance Angle Influence on the Optimum Incident Spot Size for High-Finesse Microcavity Two-Photon Absorption Photodetectors

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

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

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