Parametric Amplification of a 640 Gbit/s RZ-DPSK Signal
Zohreh Lali-DastjerdiMichael GaliliHans Christian Hansen MulvadHao HuLeif Katsuo OxenløweKarsten RottwittChristophe Peucheret
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Abstract:
We report the first demonstration and characterization of parametric amplification of a 640Gbit/s RZ-DPSK OTDM signal. With proper design of the fiber parametric amplifier, error-free amplification with less than 1 dB penalty has been achieved.Keywords:
Optical parametric amplifier
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Gigabit
Parametric oscillator
Multistage power amplifiers are prone to parametric oscillations of an odd-mode nature. In this article, a technique for detecting and avoiding odd-mode parametric oscillations in microwave power amplifiers under large-signal excitations is extended and improved. For that, two monolithic amplifiers, having different topology and different oscillation mode, are extensively analyzed. A previously analyzed X-band two-stage power amplifier is used as a first example. Then, the technique is applied to a novel L-band one-stage power amplifier exhibiting a different oscillation mode. The success in determining the oscillation nature of these two different examples and the strategies used for their stabilization clearly illustrate the potential of this technique to address the complex problem of parametric oscillations in microwave amplifiers. © 2005 Wiley Periodicals, Inc. Int J RF and Microwave CAE 15, 2005.
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Transistor array
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An ultrafast laser system for the chemically important 3-μm spectral region has been constructed by means of noncritically phased-matched KTiOPO4 optical parametric gain elements. An optical parametric oscillator, synchronously pumped by a mode-locked Ti:sapphire oscillator, generates high-quality seed pulses for an optical parametric amplifier. The optical parametric amplifier, pumped by a high-repetition-rate Ti:sapphire regenerative amplifier, amplifies the seed pulses by a factor of 520. Pulses with an energy of 550 nJ and a pulse width of 160 fs are produced at a 250-kHz repetition rate in the 3-μm region.
Optical parametric amplifier
Parametric oscillator
Regenerative amplification
Chirped pulse amplification
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We study how an optical parametric amplifier inside the cavity can affect the normal mode splitting behavior of the coupled movable mirror and the cavity field. We work in the resolved sideband regime. The spectra exhibit a double-peak structure as the parametric gain is increased. Moreover, for a fixed parametric gain, the double-peak structure of the spectrum is more pronounced with increasing the input laser power. We give results for mode splitting. The widths of the split lines are sensitive to parametric gain.
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Optical parametric amplifier
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We present the observation of several nonlinear effects in a two-crystal femtosecond optical parametric oscillator. Unusual parametric processes are observed when the total cavity length is detuned up to 7.3 mm within this synchronously pumped optical parametric oscillator.
Parametric oscillator
Optical parametric amplifier
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Crystal oscillator
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We report field-resolved detection of few-cycle pulses generated by a subharmonic optical parametric oscillator (OPO) with an octave-wide spectrum centered at 4 µm using near-infrared probe pulses phase-locked to the OPO output.
Optical parametric amplifier
Parametric oscillator
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We report pulsed squeezed-light generation by means of an optical parametric downconverter that is pumped by the second harmonic of a mode-locked Q-switched laser. Using the fundamental beam of the laser as a local oscillator, we observe 2-dB squeezing for a parametric gain of 2.0. This local oscillator, however, is nonoptimal because of its spatiotemporal mode mismatch with the squeezed mode generated by the downconverter. We describe an experiment in which a matched local oscillator is generated with the use of an optical parametric amplifier that is pumped by the same laser as is the downconverter. In this case, 2-dB squeezing is observed for a parametric gain of 1.5. The present experimental setup is limited by the uncontrollable phase fluctuations that prohibit us from making squeezing measurements at higher parametric gains.
Optical parametric amplifier
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Spontaneous parametric down-conversion
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Optical parametric amplification is inherently a broad band process and thus makes widely tunable optical amplifiers and coherent power sources possible. After a brief survey of the basic principles, the various factors contributing to a practical parametric amplifier and oscillator will be discussed. Among these will be, choice of material, phase matching, optical loss, the effect of modes, and tunability. The present status pulsed and continuous-wave parametric oscillator experiments will be reviewed and the future prospects for optical parametric devices will be discussed.
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An injection-seeded pulsed optical parametric oscillator is amplified and the frequency chirp characterized using optical heterodyne techniques. The low-chirp 842-nm signal output depends only slightly on amplifier pump energy, suitable for high-resolution spectroscopy.
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We experimentally demonstrate that the optical spring effect can be modified using an optical parametric amplifier in an opto-mechanical cavity. The theoretical analysis shows that both the gain and phase of the optical parametric amplifier can modify the frequency of a mechanical resonator in an opto-mechanical cavity. This modification could be used to tune the frequency of peak sensitivity of gravitational wave detectors. The experimental results show a factor of 1.2 ± 0.8 increase in mechanical resonator frequency shift induced by optical spring by tuning the optical parametric amplifier gain.
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Parametric oscillator
Optical cavity
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We compare different Semi-conductor Optical Amplifiers (SOA) in term of penalty and optical spectrum in single channel mode at 10 and 40 Gbit/s. It appears that limited-gain SOAs are the best choice when the bit-rate increases.
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