Raman-Enhanced Phase-Sensitive Fibre Optical Parametric Amplifier

Fu, Xuelei; Guo, Xiaojie; Shu, Chester

doi:10.1038/srep20180

Cited by 10 publications

(4 citation statements)

References 21 publications

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“…The maximum ER obtained is 13 ± 0.8 dB. Our maximum extinction ratio of 13 dB obtained with a total input microwave power of 870 mW and a coupling field power of 75 µW is higher than some of the experimental fibre optical and silicon photonic crystal wave-guide demonstrations of PSA [25,26]. These experiments show a lower ER with either comparable or much higher input powers.…”

Section: Demonstration Of Near-ideal Amplificationmentioning

confidence: 50%

Phase-sensitive amplification of an optical field using microwaves

Karigowda¹,

Adwaith²,

Nayak³

et al. 2019

Opt. Express

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We report phase-sensitive amplification (PSA) of a near-infrared electromagnetic field using room-temperature 85 Rb atoms possessing ground-state coherence. Our novelty is in achieving significant optical PSA by manipulating the intensity and phase of a frequency-separated microwave field. PSA is obtained by inducing a three-wave mixing nonlinear process utilising a three-level cyclic scheme in the D1 manifold. We achieve a near-ideal PSA with a gain of 7 dB over a range of 500 kHz bandwidth with very low pump-field intensities and with low optical depths. Such a hybrid, ground-state-coherence-assisted PSA is the first such demonstration using atomic ensembles.

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Section: Demonstration Of Near-ideal Amplificationmentioning

confidence: 50%

Phase-sensitive amplification of an optical field using microwaves

Karigowda¹,

Adwaith²,

Nayak³

et al. 2019

Opt. Express

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“…(1,2,4,5), parameters of the micro-resonator, input wave and the pump waves, we discretized Eqs. (1,2,4,5) to compute the electric field through the micro-resonator. These equations are solved using the finite difference time domain (FDTD) method at every update of the non-linear programming process.…”

Section: Methodsmentioning

confidence: 99%

“…Optical parametric amplification via nonlinear wave mixing has been extensively studied [1][2][3][4][5][6][7] and can be used for a variety of applications such as photonic integrated circuits 8 , high-speed optical comunications 9 , piezoelectric MEMS device 10 , and development of powerful ultrafast lasers 11 . Optical parametric amplification is achieved via mixing a non-linearity inducing high-intensity pump wave with an input wave of low intensity, during which the low-intensity input wave gets amplified by absorbing energy from the high-intensity pump wave 12,13 .…”

Section: Introductionmentioning

confidence: 99%

Design of Ultra-High Gain Optical Micro-Amplifiers via Smart Non-Linear Wave Mixing

Aşırım¹,

Yolalmaz²

2020

PIER B

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Optical amplification of the input wave by mixing the pump wave within a nonlinear interaction medium offers high gain for a variety of applications. In real life studies, the interaction mediums which allow the optical amplification of the input wave have many resonance frequencies. However, the computational expense for tuning the pump frequency to yield the optical amplification of the input wave increases with the number of resonance frequencies within the interaction mediums. Here, we present a Fletcher-Reeves based algorithm for parametric amplification in micro-resonators having multiple resonance frequencies. Using our novel mathematical formulations, we obtained a gain of 4.7x10 7 for the input wave at 640 THz and a gain of 1.5x10 8 for the input wave at 100 THz within the micro-resonators. Moreover, the performance of our algorithm is verified by the well know mathematical expression, and we achieved more than 99% accuracy in computation of optical amplification. To our knowledge, this is the first study where Fletcher-Reeves algorithm is used for the parametric amplification. Our methodology can be accompanied to design optical parametric amplifiers for applications of high-speed optical communications, photonic circuits, and ultrafast lasers.

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“…The above formulations are valid for the pulse propagation in PSA, as we keep the all interacting waves near zerodispersion wavelength (ZDW∼ 1540 nm) of HNLF at which dispersion length is very high for HNLF with small dispersion parameter (D = 0.4 ps/nm km) (24,30). We also neglected the stimulated Brillouin effect (SBS) and stimulated Raman effect (SRS) in HNLF, while the former can be suppressed by the use of straining or Al-doped HNLF with increased SBS threshold (31,32), the latter has proven to substantially enhance the PSA gain (33). Further, the effect of SBS and SRS can be minimized by choosing detuning between signal and pump waves away from gain spectrum of SBS and SRS (28).…”

Section: Gain Extinction Ratiomentioning

confidence: 99%

A novel scheme of cascaded four-wave mixing for phase-sensitive amplification in nonlinear optical fibre

Anchal

Krishnamurthy

Landais

2018

Journal of Modern Optics

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We propose and numerically verify a scheme of phase-sensitive amplifier (PSA) using four-wave mixing (FWM) in cascaded highly nonlinear fibres (HNLFs), without requiring initial phase-locking between signal and pump. The first HNLF is used to generate two phase-conjugate waves, which act as two pumps for FWM process in second HNLF. We feed the two pumps from opposite ends of second HNLF and a signal co-propagating with one of the pumps. We keep the signal frequency in the middle of two pump frequencies to obtain phase-conjugate wave at the same frequency as the signal by FWM process in second HNLF. Signal and phase-conjugate wave appear at opposite ends of the second HNLF and combined to obtain PSA. The frequency-shift-free operation of phase conjugation helps in preserving the frequency of input signal during phase-sensitive amplification. We derive the expression for PSA signal output and PSA gain and show analytically that PSA gain depends upon signal phase only, as the two pumps are phase conjugate to each other. Thus, eliminating the need of phase locking between signal and pump waves. We show that PSA provides high gain for in-phase component and almost cancellation for quadrature-phase component of signal. We show the broadband nature of PSA due to minimum effect of group velocity and group velocity dispersion owing to counter-propagating nature of signal and conjugate waves. We study the performance of PSA under the effects of pumpsignal detuning, amplifier length and input signal phase. Simulation results show that PSA output is forced to attain 0 or π phase regardless of large variation of phase in the input signal. Nonlinear phase noise reduction of 100 Gbps DPSK signal transmitted over 1000-km standard single-mode fibre confirms phase regeneration by PSA.

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Raman-Enhanced Phase-Sensitive Fibre Optical Parametric Amplifier

Cited by 10 publications

References 21 publications

Phase-sensitive amplification of an optical field using microwaves

Phase-sensitive amplification of an optical field using microwaves

Design of Ultra-High Gain Optical Micro-Amplifiers via Smart Non-Linear Wave Mixing

A novel scheme of cascaded four-wave mixing for phase-sensitive amplification in nonlinear optical fibre

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