Digital Coherence Enhancement Enabling 6-GBd DP-64QAM Using a 1.4-MHz Linewidth Laser

Lavery, Domaniç; Maher, Robert; Paskov, Milen; Thomsen, Benn C.; Bayvel, Polina; Savory, Seb J.

doi:10.1109/lpt.2013.2283744

Cited by 8 publications

(6 citation statements)

References 15 publications

(21 reference statements)

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“…[ [26][27][28][33][34][35][36]. Among these methods, the digital coherence enhancement shows the best performance [26,36], while it requires a complicated hardware implementation to measure the LO laser phase fluctuation.…”

Section: Discussionmentioning

confidence: 99%

“…Among these methods, the digital coherence enhancement shows the best performance [26,36], while it requires a complicated hardware implementation to measure the LO laser phase fluctuation. By contrast, EEPN does not exist in the coherent transmission systems using optical dispersion compensation, such as dispersion compensating fibers (DCFs) and dispersion compensating modules (DCMs) [18,19,22,25,37,38].…”

Section: Discussionmentioning

confidence: 99%

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Analytical BER performance in differential n-PSK coherent transmission system influenced by equalization enhanced phase noise

Jacobsen

Popov

et al. 2015

Optics Communications

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Long-haul high speed optical transmission systems are significantly distorted by the interplay between the electronic chromatic dispersion (CD) equalization and the local oscillator (LO) laser phase noise, which leads to an effect of equalization enhanced phase noise (EEPN). The EEPN degrades the performance of optical communication systems severely with the increment of fiber dispersion, LO laser linewidth, symbol rate, and modulation format. In this paper, we present an analytical model for evaluating the performance of bit-error-rate (BER) versus signal-to-noise ratio (SNR) in the n-level

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Analytical BER performance in differential n-PSK coherent transmission system influenced by equalization enhanced phase noise

Jacobsen

Popov

et al. 2015

Optics Communications

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“…The second arm was passed into the differential phase noise measurement setup, which consisted of a 90°optical hybrid, balanced receivers and a two channel optical sampling oscilloscope. An additional delay (τ ) was added to one of the optical hybrid arms to create an interferometer, with the maximum frequency (1/τ ) of the measurement technique inversely proportional to the delay, as described in [7]. Finally, a noise loading stage was employed to vary the received OSNR for BER measurements.…”

Section: Fast Wavelength Switching Digital Coherent Receivermentioning

confidence: 99%

“…Several techniques for transmitter laser phase noise reduction have previously been demonstrated [4], [5], while Secondini et al, demonstrated a ten-fold phase noise reduction of a LO laser in a digital coherent receiver [6]. In this letter, the digital coherence enhancement technique proposed in [6] was adapted [7] and applied to a fast wavelength switching DS-DBR LO laser. It is the first demonstration, to the best of our knowledge, of a fast wavelength switching DP-16QAM digital coherent burst mode receiver, that utilizes a commercially available DBR based tunable laser as the LO.…”

mentioning

confidence: 97%

Fast Wavelength Switching 6 GBd Dual Polarization 16QAM Digital Coherent Burst Mode Receiver

Maher

Lavery

Paskov

et al. 2014

IEEE Photon. Technol. Lett.

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Abstract-A commercially available digital supermode distributed Bragg reflector tunable laser is employed as a fast wavelength switching local oscillator (LO) in a dual polarization (DP) 16-quadrature amplitude modulation (16QAM) coherent burst mode receiver. A digital coherence enhancement technique is used to compensate both the Lorentzian and non-Lorentzian distributed phase noise of the tunable LO laser. It is shown that differential decoding is not sufficient to overcome the substantial bit errors caused by the LO laser phase noise. However, the coherence enhancement technique enables the reception of low symbol rate DP-16QAM bursts, with an average optical signal to noise ratio penalty of 3.5 dB observed relative to theory at the forward error correction threshold (1.5 × 10 −2 ).

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“…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%

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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Digital Coherence Enhancement Enabling 6-GBd DP-64QAM Using a 1.4-MHz Linewidth Laser

Cited by 8 publications

References 15 publications

Analytical BER performance in differential n-PSK coherent transmission system influenced by equalization enhanced phase noise

Analytical BER performance in differential n-PSK coherent transmission system influenced by equalization enhanced phase noise

Fast Wavelength Switching 6 GBd Dual Polarization 16QAM Digital Coherent Burst Mode Receiver

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

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