Two-stage all-optical subharmonic clock recoveryusingmodelocked semiconductor lasers

Yokoyama, Hiroyuki; Hashimoto, Y.; Kurita, H.; Ogura, I.

doi:10.1049/el:20001124

Cited by 22 publications

(6 citation statements)

References 3 publications

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“…Unfortunately, base-rate clocks are essential for demultiplexing and add-drop multiplexing. Assistive techniques can be used to improve the performance but at the expense of increased complexity [45], [46].…”

Section: Clock Recoverymentioning

confidence: 99%

High-Speed OTDM and WDM Networks Using Traveling-Wave Electroabsorption Modulators

Chou

Bowers

2007

IEEE J. Select. Topics Quantum Electron.

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Abstract-We describe the design and performance of a number of elements based on traveling-wave electroabsorption modulators (TW-EAMs) in optical time-division-multiplexing (OTDM) and wavelength-division-multiplexing (WDM) networks. The incorporation of traveling-wave (TW) electrode design into electroabsorption modulators (EAMs) relieves the resistance-capacitance (RC) bandwidth limitation common to lumped components, enabling higher operation speed without shortening the device. As a result, high-speed operation can be combined with essential modulator characteristics such as modulation efficiency and extinction ratio. While significant modulation bandwidth has been achieved, a lesser known aspect is that the TW electrode also provides an extra dimension for improving and enabling functionalities beyond broadband modulation. This new dimension originates from the distributed effect of the TW design and its interactions with distinctive EAM properties. This paper reviews such developments in recent years with specific applications for optical signal processing in OTDM and WDM networks. The covered functionalities include various optical gating operations for OTDM, regenerative wavelength conversions for WDM, and clock recovery.Index Terms-Clock recovery, electroabsorption, optical signal processing, optical time-division multiplexing (OTDM), travelingwave (TW), wavelength-division multiplexing (WDM).

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Section: Clock Recoverymentioning

confidence: 99%

High-Speed OTDM and WDM Networks Using Traveling-Wave Electroabsorption Modulators

Chou

Bowers

2007

IEEE J. Select. Topics Quantum Electron.

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“…Several techniques have been suggested to realize all-optical clock division in recent years. [16][17][18][19] The fact that period doubling can be enhanced by optical injection suggests that it is possible to realize all-optical clock frequency division by replacing the electrical current modulation with optical modulation by injecting an optical clock signal. The experimental set-up used to demonstrate all-optical clock frequency division based on period doubling enhancement is shown schematically in Fig.…”

Section: All-optical Clock Frequency Division By Period Doubling Enhamentioning

confidence: 99%

Control of period doubling in modulated semiconductor lasers and its application to all-optical clock division

Yang

Liu²,

Matsui³

2001

SPIE Proceedings

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Period doubling is an irregular phenomenon exhibited by semiconductor lasers under high frequency modulation. When it occurs, the repetition frequency of the laser power becomes half of that of the modulation signals, which is undesirable to most applications. This paper reports the control of period doubling in modulated semiconductor lasers by external optical injection and demonstrates for the first time that such nonlinear dynamics can be used advantageously in realizing alloptical clock frequency division. We show that period doubling in modulated semiconductor lasers can be either suppressed or enhanced by providing external CW optical injection. The dependence on injection wavelength, and injection power has been investigated systematically to establish an improved understanding towards the control of period doubling in modulated semiconductor lasers.The fact that period doubling can be enhanced by optical injection is further used to realize all-optical clock frequency division. To demonstrate this, an optical clock signal at 19.6 GHz was injected into a semiconductor laser. By adjusting the resonance frequency of the laser to around 9.8 GHz through dc bias, strong period doubling was observed, which resulted in a frequency-halved optical clock signal at 9.8 GHz with a remarkably low level of phase noise (-87.7 dBc/Hz @ 10 kHz offset frequency). Our investigations have also shown that without changing the biasing condition of the laser this low level of phase noise can be maintained within 1-dB range over an input frequency range of 400 MHz, which is a distinct advantage over other techniques.

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“…All optical clock recovery is an essential technology to solve this issue in OTDM network. In the recent years, a number of techniques have been proposed, such as self-pulsed semiconductor laser diodes, mode-locked external cavity lasers, passive mode-locked laser diodes, and semiconductor fiber ring laser [1][2][3][4] . These techniques show excellent performances.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on period doubling of multiple quantum well Fabry-Perot laser

Zhao

Zhang

et al. 2007

SPIE Proceedings

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We experimentally study the period doubling phenomenon of gain-switched multiple quantum well Fabry-Perot laser diodes with/without external optical injection. The relations between resonance frequency and modulation frequency are analyzed detailedly when period doubling occurs. The obtained research results indicate that external optical injection may be an effective technique to suppress or enhance period doubling of a gain switched laser diode with injection optical power. Experiments show that the period doubling would appear in a broader frequency range with external optical injection, and indicate that period doubling occurs over a wide range of modulation frequency in laser diode as the injection power increases. Moreover, we have studied in detail that period doubling easily occurs when bias current is located between 1.1I th and 1.3I th , and modulation current is set between 0.5I dc and 2.5I dc .

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Two-stage all-optical subharmonic clock recoveryusingmodelocked semiconductor lasers

Cited by 22 publications

References 3 publications

High-Speed OTDM and WDM Networks Using Traveling-Wave Electroabsorption Modulators

High-Speed OTDM and WDM Networks Using Traveling-Wave Electroabsorption Modulators

Control of period doubling in modulated semiconductor lasers and its application to all-optical clock division

Experimental study on period doubling of multiple quantum well Fabry-Perot laser

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