Characterization of time-resolved laser differential phase using 3D complementary cumulative distribution functions

Walsh, Anthony J.; O'Dowd, J.; Bessler, Vivian; Shi, Kai; Smyth, Frank; Dailey, James M.; Kelleher, Bryan; Barry, Liam P.; Ellis, A.D.

doi:10.1364/ol.37.001769

Cited by 6 publications

(4 citation statements)

References 3 publications

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“…The external cavity laser was kept static at a frequency <10 GHz away from the destination wavelength of the tunable laser under test. Using the external cavity laser as a low phase noise reference it was possible to calculate the phase evolution of the switching tunable laser as it arrived at its destination channel and from this determine the expected BER which comes from the time resolved CCDF of the absolute corrected differential phase, which was measured and explained in detail in [10]. The BER determined from the phase noise analysis is shown to predict the experiment TRBER measurement extremely well (Fig.…”

Section: Limitations On Ber Recovery After Laser Switchingmentioning

confidence: 85%

Time Resolved Bit Error Rate Analysis of a Fast Switching Tunable Laser for Use in Optically Switched Networks

O'Dowd

Shi

Walsh

et al. 2012

J. Opt. Commun. Netw.

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Abstract-We investigate the use of different direct detection modulation formats in a wavelength switched optical network. We find the minimum time it takes a tunable sampled grating distributed Bragg reflector laser to recover after switching from one wavelength channel to another for different modulation formats. The recovery time is investigated utilizing a field programmable gate array which operates as a time resolved bit error rate detector. The detector offers 93 ps resolution operating at 10.7 Gb/s and allows for all the data received to contribute to the measurement, allowing low bit error rates to be measured at high speed. The recovery times for 10.7 Gb/s non-return-to-zero on-off keyed modulation, 10.7 Gb/s differentially phase shift keyed signal and 21.4 Gb/s differentially quadrature phase shift keyed formats can be as low as 4 ns, 7 ns and 40 ns, respectively. The time resolved phase noise associated with laser settling is simultaneously measured for 21.4 Gb/s differentially quadrature phase shift keyed data and it shows that the phase noise coupled with frequency error is the primary limitation on transmitting immediately after a laser switching event.

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Section: Limitations On Ber Recovery After Laser Switchingmentioning

confidence: 85%

Time Resolved Bit Error Rate Analysis of a Fast Switching Tunable Laser for Use in Optically Switched Networks

O'Dowd

Shi

Walsh

et al. 2012

J. Opt. Commun. Netw.

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“…In the recent decade, improvements in high-resolution digital sampling and phase diverse optical coherent receivers have enabled the direct measurement of FM-noise. We list the FM-noise measurement techniques here: (i) laser FM-noise can be measured by mixing the laser light with an optical local oscillator and phase diversity receiver [6]- [7]; (ii) a DSH method using strong phase modulation combined with a single photodetector and a digital storage oscilloscope (DSO) [8], we term that method the DSH-DSO technique; and (iii) a delayed self-homodyne (DSHo) phase diversity coherent receiver [8] which we term DSHo-DSO. These techniques require sampling at rates of the order of gigahertz to recover the optical field and hence extract the FM-noise SD.…”

Section: Introductionmentioning

confidence: 99%

High Precision Estimation of Laser FM-Noise Using RF Quadrature Demodulation Techniques

O’Dúill¹,

Barry²

2022

IEEE Access

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We report on a technique that uses RF quadrature demodulation to measure laser FM-noise based on a delayed self-heterodyne setup. The measurement is self-referencing and the FM-noise can be measured with high precision over a sufficiently long duration that allows us to explore the limits imposed by the delay line in the self-heterodyne setup. We perform this measurement for two external cavity lasers with linewidths of tens of kilohertz and a fiber laser with a linewidth of 20 Hz. The scheme is checked and verified by finding good agreement between the FM-noise measured from beating the two external cavity lasers and the sum of the individual FM-noise of each laser.

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“…Generally, the noise features of a narrow linewidth laser can be revealed through the following two schemes. One is comparing the frequency of a target laser with reference lasers by the beat-note method [19]. If the target laser is beat with only one reference laser, we will get an electrical signal that contains noise information of both lasers, but fail to separate their contributions.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Laser Frequency Nosie Spectrum by Continuous Dynamical Decoupling

Zhang,

Xie,

Zhang

et al. 2020

Preprint

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Decoherence induced by the laser frequency noise is one of the most important obstacles in the quantum information processing. In order to suppress this decoherence, the noise power spectral density needs to be accurately characterized. Here, we experimentally obtain the spectrum of laser frequency noise based on the continuous dynamical decoupling technique. We first estimate the mixture-noise (including laser and magnetic noises) spectrum over a frequency range 0-(2π)530 kHz by monitoring the transverse relaxation from an initial state |+σx , followed by a gradient descent data process protocol. Then the contribution from the laser noise is extracted by enconding the qubits on different Zeeman sublevels. We also investigate two sufficiently strong noise components by making an analogy between these noises and driving lasers whose lineshape is assumed to be Lorentzian. This method is verified by the experimental data and finally helps to characterize the noise.

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Characterization of time-resolved laser differential phase using 3D complementary cumulative distribution functions

Cited by 6 publications

References 3 publications

Time Resolved Bit Error Rate Analysis of a Fast Switching Tunable Laser for Use in Optically Switched Networks

Time Resolved Bit Error Rate Analysis of a Fast Switching Tunable Laser for Use in Optically Switched Networks

High Precision Estimation of Laser FM-Noise Using RF Quadrature Demodulation Techniques

Estimation of the Laser Frequency Nosie Spectrum by Continuous Dynamical Decoupling

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