Probabilistically shaped PDM 4096-QAM transmission over up to 200 km of fiber using standard intradyne detection

Olsson, Samuel L. I.; Cho, Junho; Chandrasekhar, S.; Chen, Xi; Winzer, Peter J.; Makovejs, Sergejs

doi:10.1364/oe.26.004522

Cited by 79 publications

(22 citation statements)

References 12 publications

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“…Ultralow noise (ULN) semiconductor lasers with high power are required for a wide range of applications, including highperformance coherent communications systems [1], ultraprecise timing [2], frequency synthesis [3], spectroscopy [4], and distributed sensing systems [5]. Furthermore, there is significant demand for high-power ULN lasers in RF photonic analog links and processing [6][7][8], as well as optically processed phase array antennas.…”

Section: Introductionmentioning

confidence: 99%

High-power sub-kHz linewidth lasers fully integrated on silicon

Huang

Tran

Guo

et al. 2019

Optica

153

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We demonstrate a fully integrated extended distributed Bragg reflector (DBR) laser with ∼1 kHz linewidth and over 37 mW output power, as well as a ring-assisted DBR laser with less than 500 Hz linewidth. The extended DBR lasers are fabricated by heterogeneously integrating III-V material on Si as a gain section plus a 15 mm long, low-kappa Bragg grating reflector in an ultralow-loss silicon waveguide. The low waveguide loss (0.16 dB/cm) and long Bragg grating with narrow bandwidth (2.9 GHz) are essential to reducing the laser linewidth while maintaining high output power and single-mode operation. The combination of narrow linewidth and high power enable its use in coherent communications, RF photonics, and optical sensing.

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Section: Introductionmentioning

confidence: 99%

High-power sub-kHz linewidth lasers fully integrated on silicon

Huang

Tran

Guo

et al. 2019

Optica

153

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“…Diode lasers with single-mode oscillation, mode-hop-free wavelength tunability and intrinsic low phase noise through a narrow Schawlow-Townes linewidth are instrumental in many applications. These include communication technology, for instance, to raise the data flow in fiber networks with advanced phase encoding [1], or as on-chip local oscillators for integrated microwave photonics [2]. Other applications include retrieval of information with highest precision, sensitivity, and speed, such as with spectroscopic detection, monitoring and sensing [3,4,5,6], for ranging with diode-driven frequency combs [7,8,9], or to advance time keeping with chip-integrated, portable optical clocks [10].…”

Section: Introductionmentioning

confidence: 99%

“…Laser (3), includes an optical filter with bandwidth ∆ν f that provides for both single-mode oscillation and significant enhancement of the cavity photon lifetime. The resulting effective cavity length Lc3 is assumed to be equal to that of laser (2), while the bus waveguide is taken the same as that of laser (1). (b) The tuning behavior of the three lasers.…”

Section: Introductionmentioning

confidence: 99%

Ring resonator enhanced mode-hop-free wavelength tuning of an integrated extended-cavity laser

Rees¹,

Fan²,

Geskus³

et al. 2020

Opt. Express

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Extending the cavity length of diode lasers with feedback from Bragg structures and ring resonators is highly effective for obtaining ultra-narrow laser linewidths. However, cavity length extension also decreases the free-spectral range of the cavity. This reduces the wavelength range of continuous laser tuning that can be achieved with a given phase shift of an intracavity phase tuning element. We present a method that increases the range of continuous tuning to that of a short equivalent laser cavity, while maintaining the ultra-narrow linewidth of a long cavity. Using a single-frequency hybrid integrated InP-Si3N4 diode laser with 120 nm coverage around 1540 nm, with a maximum output of 24 mW and lowest intrinsic linewidth of 2.2 kHz, we demonstrate a six-fold increased continuous and mode-hop-free tuning range of 0.22 nm (28 GHz) as compared to the free-spectral range of the laser cavity. arXiv:1912.09455v1 [physics.optics]

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“…Thus, it is equally important to mitigate the nonlinearity for the coherent IQ transponder using the high order QAM. As an example, the next generation coherent DWDM system uses the probability shaping constellation (PSC) QAM [4], and the state-of-the-art demonstration utilizes 4096-PSC-QAM [5].…”

Section: Introductionmentioning

confidence: 99%

Compensation of Limited Bandwidth and Nonlinearity for Coherent Transponder

2019

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Coherent optical transponders are widely deployed in today’s long haul and metro optical networks using dense wavelength division multiplexing. To increase the data carrying capacity, the coherent transponder utilizes the high order modulation format and operates at a high baud rate. The limited bandwidth and the nonlinearity are two critical impairments for the coherent in-phase quadrature transmitter. These impairments can be mitigated by digital filters. However, to accurately determine the coefficients of these filters is difficult because the impairment from the limited bandwidth and the impairment from nonlinearity are coupled together. In this paper, we present a novel method to solve this problem. During the initial power-up, we apply a sinusoidal stimulus to the coherent IQ transmitter. We then scan the frequency and amplitude of the stimulus and monitor the output power. By curve-fitting with an accurate mathematical model, we determine the limited bandwidth, the nonlinearity, the power imbalance, and the bias point of the transponder simultaneously. Optimized coefficients of the digital filters are determined accordingly. Furthermore, we utilize a coherent IQ transponder and demonstrate that the limited bandwidth is improved by the finite impulse response filter, while nonlinearity is mitigated by the memoryless Volterra filter.

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Probabilistically shaped PDM 4096-QAM transmission over up to 200 km of fiber using standard intradyne detection

Cited by 79 publications

References 12 publications

High-power sub-kHz linewidth lasers fully integrated on silicon

High-power sub-kHz linewidth lasers fully integrated on silicon

Ring resonator enhanced mode-hop-free wavelength tuning of an integrated extended-cavity laser

Compensation of Limited Bandwidth and Nonlinearity for Coherent Transponder

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