Frequency multiplication in actively mode-locked semiconductor lasers

Onodera, Noriaki; Lowery, Arthur J.; Zhai, L.; Ahmed, Z.; Tucker, R.S.

doi:10.1063/1.108720

Cited by 67 publications

(19 citation statements)

References 8 publications

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“…Rational harmonic mode-locking generates a pulse train by detuning, and the repetition rate of the pulse train is several times higher than the frequency of the modulator. However, the output pulse amplitude is not uniform [2,3].…”

Section: Introductionmentioning

confidence: 97%

A study of a higher order FM mode‐locking laser with double phase modulators

Shikatani¹,

Izutsu²

2003

Electron Comm Jpn Pt II

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SUMMARYGenerating high-repetition-rate short pulses from higher order FM mode-locked lasers requires many sidebands. However, in reality, the physical limit of modulators makes it impossible to increase the modulation index. This paper proposes a novel higher order FM mode-locked laser that has two PM-I-FP sets (phase modulator, isolator, and Fabry-Perot filter) and presents an analysis of its performance. The laser uses a new technique that makes the value of the synthesized transfer function of a PM-I-FP equal in both the 0 and π phase states. This technique improves the frequency characteristics of the modulator substantially. As a result, the maximum repetition rate is doubled, and the laser also generates a chirp-free and narrower pulse train with uniform amplitude and pulse width. We also propose a system that has only one PM-I-FP. This eliminates problems that arise due to differences in the PM-I-FP characteristics when two PM-I-FP sets are used. The same effects as mentioned above are achieved.

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Section: Introductionmentioning

confidence: 97%

A study of a higher order FM mode‐locking laser with double phase modulators

Shikatani¹,

Izutsu²

2003

Electron Comm Jpn Pt II

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“…is the repetition period of the external signal. This technique for repetition frequency multiplication [35] is well described in [36] and [37] and has been found to be successful with mode-locked semiconductor lasers [36] or with Li NbO modulators in cavities with EDFAs [38], [39]. However, due to loss modulation in these experimental setups, the rational harmonic mode-locking technique produces optical pulses with uneven amplitudes for repetition rate multiplication.…”

Section: Experimental Setup Of the Semiconductor Fibermentioning

confidence: 99%

Ultrafast Semiconductor-Based Fiber Laser Sources

Vlachos¹,

Bintjas

Pleros

et al. 2004

IEEE J. Select. Topics Quantum Electron.

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Abstract-In this paper, a novel ring laser platform is presented that uses a single active element, a semiconductor optical amplifier (SOA), to provide both gain and gain modulation in the optical cavity. Gain modulation is achieved by an externally introduced optical pulsed signal. This signal periodically saturates the amplifier gain and forces the ring laser to mode lock. Using this laser platform, we demonstrate picosecond pulsetrain generation at repetition rates up to 40 GHz, either in single or multiwavelength operation mode. In particular, using rational harmonic mode locking, 2.5-ps pulses were obtained up to a 40-GHz repetition rate, while output pulses and output power were constant over a 20-nm tuning range. In addition, a multiwavelength optical signal was obtained using the same laser platform with the addition of a Fabry-Pérot filter for comb generation. Multiwavelength oscillation is possible due to the broad gain spectrum of the SOA used and its inhomogeneous line broadening. To this end, 48 oscillating wavelengths were obtained at the laser output, with 50-GHz line spacing. Combining both modes of operation, it was possible to mode lock the oscillating multiwavelength signal and to obtain at the output ten wavelength channels, simultaneously mode locked at a 30-GHz repetition rate. The mode-locked channels are temporarily synchronized and exhibit almost identical spectral and time characteristics.

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“…Repetition rate multiplication can also be achieved by detuning the external signal frequency so that it satisfies the condition , where is an integer number greater than 1. With this technique the source mode-locks in a repetition rate equal to [24] and has been recently referred to as rational harmonic mode-locking [21], [25].…”

Section: A High-speed Laser Sourcesmentioning

confidence: 99%

Ultrafast time-domain technology and its application in all-optical signal processing

Vlachos¹,

Pleros

Bintjas

et al. 2003

J. Lightwave Technol.

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Abstract-In this paper, we review recent advances in ultrafast optical time-domain technology with emphasis on the use in optical packet switching. In this respect, several key building blocks, including high-rate laser sources applicable to any time-division-multiplexing (TDM) application, optical logic circuits for bitwise processing, and clock-recovery circuits for timing synchronization with both synchronous and asynchronous data traffic, are described in detail. The circuits take advantage of the ultrafast nonlinear transfer function of semiconductor-based devices to operate successfully at rates beyond 10 Gb/s. We also demonstrate two more complex circuits-a header extraction unit and an exchange-bypass switch-operating at 10 Gb/s. These two units are key blocks for any general-purpose packet routing/switching application. Finally, we discuss the system perspective of all these modules and propose their possible incorporation in a packet switch architecture to provide low-level but high-speed functionalities. The goal is to perform as many operations as possible in the optical domain to increase node throughput and to alleviate the network from unwanted and expensive optical-electrical-optical conversions.Index Terms-Exchange-bypass switch, interferometric gates, optical switching, optical time-division multiplexing (OTDM), packet switching, optical signal processing, semiconductor optical amplifier (SOA).

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Frequency multiplication in actively mode-locked semiconductor lasers

Cited by 67 publications

References 8 publications

A study of a higher order FM mode‐locking laser with double phase modulators

A study of a higher order FM mode‐locking laser with double phase modulators

Ultrafast Semiconductor-Based Fiber Laser Sources

Ultrafast time-domain technology and its application in all-optical signal processing

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