Phase Noise Characterization of SGDBR Lasers Using Phase Modulation Detection Method With Delayed Self-Heterodyne Measurements

Huynh, Tam N.; Nguyen, Lim; Barry, Liam P.

doi:10.1109/jlt.2013.2247564

Cited by 80 publications

(51 citation statements)

References 23 publications

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“…Together, these components allow the use of the phase diversity technique used extensively in coherent optical communications [37]. Although the same setup has been demonstrated before, it was only used with interferometer fields decorrelated by multikilometer delay-lines [20,21] and to stabilize the relatively unstable lasers used for data transmission applications [22]. Here, we highlight the advantages and limitations of this configuration used in the coherent regime with optimal signal processing and demonstrate that it can be used for the challenging noise characterization of highly-stable lasers.…”

Section: Simultaneous Fn and Rin Measurements Using The Phase Diversimentioning

confidence: 99%

“…This is achieved by replacing the 50/50 output coupler of the interferometer with an optical 90 • hybrid coupler in order to perform in-phase (I) and quadrature (Q) detection of the mixed optical fields [ figure 1(b)]. This is commonly done in the field of optical communications [20,21,22]. However, this idea has not yet significantly diffused to the optical metrology community and has not been applied for the characterization of highly-stable lasers.…”

Section: Introductionmentioning

confidence: 99%

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Passive coherent discriminator using phase diversity for the simultaneous measurement of frequency noise and intensity noise of a continuous-wave laser

et al. 2016

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The frequency noise and intensity noise of a laser set the performance limits in many modern photonics applications and, consequently, must often be characterized. As lasers continue to improve, the measurement of these noises however becomes increasingly challenging. Current approaches for the characterization of very high-performance lasers often call for a second laser with equal or higher performance to the one that is to be measured, an incoherent interferometer having an extremely long delay-arm, or an interferometer that relies on an active device. These instrumental features can be impractical or problematic under certain experimental conditions. As an alternative, this paper presents an entirely passive coherent interferometer that employs an optical 90° hybrid coupler to perform in-phase and quadrature detection. We demonstrate the technique by measuring the frequency noise power spectral density of a highly-stable 192 THz (1560 nm) fiber laser over five frequency decades. Simultaneously, we are able to measure its relative intensity noise power spectral density and characterize the correlation between its amplitude noise and phase noise. We correct some common misconceptions through a detailed theoretical analysis and demonstrate the necessity to account for normal imperfections of the optical 90° hybrid coupler. We finally conclude that this passive coherent discriminator is suitable for reliable and simple noise characterization of highly-stable lasers, with bandwidth and dynamic range benefits but susceptibility to additive noise contamination.

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Section: Simultaneous Fn and Rin Measurements Using The Phase Diversimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Passive coherent discriminator using phase diversity for the simultaneous measurement of frequency noise and intensity noise of a continuous-wave laser

et al. 2016

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“…Figure 1 shows the frequency PSD and optical lineshape for a frequency modulation (FM) particular noise model. It is a common practice to scale the result by π in order to match the intrinsic linewidth (∆υ int ) with what would be the 3 dB linewidth if the lineshape was Lorentzian (white frequency noise) [16]. The phase noise PSD can be obtained by simply dividing the frequency noise PSD by f 2 .…”

Section: Semiconductor Laser Frequency Noise Modelmentioning

confidence: 99%

Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links

et al. 2016

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Abstract:We discuss the implications of using monolithically integrated semiconductor lasers in high capacity optical coherent links suitable for metro applications, where the integration capabilities of semiconductor lasers make them an attractive candidate to reduce transceiver cost. By investigating semiconductor laser frequency noise profiles we show that carrier induced frequency noise plays an important role in system performance. We point out that, when such lasers are employed, the commonly used laser linewidth fails to estimate system performance, and we propose an alternative figure of merit that we name "Effective Linewidth". We derive this figure of merit analytically, explore it by numerical simulations and experimentally validate our results by transmitting a 28 Gbaud DP-16QAM over an optical link. Our investigations cover the use of semiconductor lasers both in the transmitter side and as a local oscillator at the receiver. The obtained results show that our proposed "effective linewidth" is easy to measure and accounts for frequency noise more accurately, and hence the penalties associated to phase noise in the received signal.

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“…The relation depends on the specific CPR technique but tends to be linear. 7 1/f , or flicker noise has also been extensively studied, [22][23][24] where the penalty seems to increase exponentially with the amount of 1/f noise. For carrier induced frequency noise, however, no studies has been found on system performance.…”

Section: Impact On System Performancementioning

confidence: 99%

Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems

Olmedo¹,

Pang²,

Schatz

et al. 2015

SPIE Proceedings

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We discuss about digital signal processing approaches that can enable coherent links based on semiconductor lasers. A state-of-the art analysis on different carrier-phase recovery (CPR) techniques is presented. We show that these techniques are based on the assumption of lorentzian linewidth, which does not hold for monolithically integrated semiconductor lasers. We investigate the impact of such lineshape on both 3 and 20 dB linewidth and experimentally conduct a systematic study for 56-GBaud DP-QPSK and 28-GBaud DP-16QAM systems using a decision directed phase look loop algorithm. We show how carrier induced frequency noise has no impact on linewidth but a significant impact on system performance; which rises the question on whether 3-dB linewidth should be used as performance estimator for semiconductor lasers.

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Phase Noise Characterization of SGDBR Lasers Using Phase Modulation Detection Method With Delayed Self-Heterodyne Measurements

Cited by 80 publications

References 23 publications

Passive coherent discriminator using phase diversity for the simultaneous measurement of frequency noise and intensity noise of a continuous-wave laser

Passive coherent discriminator using phase diversity for the simultaneous measurement of frequency noise and intensity noise of a continuous-wave laser

Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links

Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems

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