Terabit optical OFDM superchannel transmission via coherent carriers of a hybrid chip-scale soliton frequency comb

Geng, Yong; Huang, Xiatao; Cui, Wenwen; Ling, Yun; Xu, Bo; Zhang, Jin; Yi, Xingwen; Wu, Baojian; Huang, Shu‐Wei; Qiu, Kun; Wong, Chee Wei; Zhou, Heng

doi:10.1364/ol.43.002406

Cited by 51 publications

(15 citation statements)

References 20 publications

(1 reference statement)

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“…In particular, DKS generated in high finesse microresonators associated with a Kerr frequency comb has attracted considerable interest, as it simultaneously gives rise to ultrashort mode-locked pulses 4–6 and broadband comb spectra 7–10 with good intrinsic stabilization potential 11 and a smooth envelope 12 . Moreover, DKS microcombs not only exhibit abundant physical dynamics 13–26 but also demonstrate immense practical prospects ranging from high capacity fiber transmission 27,28 , an ultra-stable microwave source 29 , and a photonic frequency synthesizer 30 , to precision laser metrology and spectroscopy 31–35 .…”

Section: Introductionmentioning

confidence: 99%

Soliton bursts and deterministic dissipative Kerr soliton generation in auxiliary-assisted microcavities

et al. 2019

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Dissipative Kerr solitons in resonant frequency combs offer a promising route for ultrafast mode-locking, precision spectroscopy and time-frequency standards. The dynamics for the dissipative soliton generation, however, are intrinsically intertwined with thermal nonlinearities, limiting the soliton generation parameter map and statistical success probabilities of the solitary state. Here, via use of an auxiliary laser heating approach to suppress thermal dragging dynamics in dissipative soliton comb formation, we demonstrate stable Kerr soliton singlet formation and soliton bursts. First, we access a new soliton existence range with an inverse-sloped Kerr soliton evolution—diminishing soliton energy with increasing pump detuning. Second, we achieve deterministic transitions from Turing-like comb patterns directly into the dissipative Kerr soliton singlet pulse bypassing the chaotic states. This is achieved by avoiding subcomb overlaps at lower pump power, with near-identical singlet soliton comb generation over twenty instances. Third, with the red-detuned pump entrance route enabled, we uncover unique spontaneous soliton bursts in the direct formation of low-noise optical frequency combs from continuum background noise. The burst dynamics are due to the rapid entry and mutual attraction of the pump laser into the cavity mode, aided by the auxiliary laser and matching well with our numerical simulations. Enabled by the auxiliary-assisted frequency comb dynamics, we demonstrate an application of automatic soliton comb recovery and long-term stabilization against strong external perturbations. Our findings hold potential to expand the parameter space for ultrafast nonlinear dynamics and precision optical frequency comb stabilization.

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Section: Introductionmentioning

confidence: 99%

Soliton bursts and deterministic dissipative Kerr soliton generation in auxiliary-assisted microcavities

et al. 2019

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“…Our experiments utilize two silicon nitride micro-ring cavities with similar free spectral range (FSR) of ∼ 100 GHz [27]. A low-noise fiber laser with wavelength λ pump ∼1550.0 nm is used as the pump laser C Tx (0) to produce a DKS microcomb C Tx (m)(m = ±1, 2, 3, ...) in the transmitter microcavity, via the technique of auxiliary laser heating (ALH) (see Methods) [28][29][30]. ALH is adopted in order to suppress the thermal nonlinearity of microcavity resonances and allow the pump laser to stably access single soliton state in the red-detuning regime.…”

Section: Resultsmentioning

confidence: 99%

Coherent optical communications using coherence-cloned Kerr soliton microcombs

Geng

Zhou

Han

et al. 2021

Preprint

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Dissipative Kerr soliton microcomb has been recognized as a promising on-chip multi-wavelength laser source for fiber optical communications, as its comb lines possess frequency and phase stability far beyond the independent lasers. In the scenarios of coherent optical transmission and interconnect, a highly beneficial but rarely explored target is to re-generate a Kerr soliton microcomb at the receiver side as local oscillators that conserve the frequency and phase property of the incoming data carriers, so that to enable coherent detection with minimized optical and electrical compensations. Here, by using the techniques of pump laser conveying and two-point locking, we implement re-generation of a Kerr soliton microcomb that faithfully clones the frequency and phase coherence of another microcomb sent from 50 km away. Moreover, leveraging the coherence-cloned soliton microcombs as carriers and local oscillators, we demonstrate terabit coherent data interconnect, wherein traditional digital processes for frequency offset estimation is totally dispensed with, and carrier phase estimation is substantially simplified via slowed-down phase estimation rate per channel and joint phase estimation among multiple channels. Our work reveals that, in addition to providing a multitude of laser tones, regulating the frequency and phase of Kerr soliton microcombs among transmitters and receivers can significantly improve optical coherent communication in terms of performance, power consumption, and simplicity.

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“…A clockwise (cw) pump laser (Toptica, CTL 1550) around 1551nm couples into the microrod resonator through a tapered fiber. Meanwhile an auxiliary laser (Toptica, CTL 1550) settled around 1541nm couples into the cavity from the opposite direction to compensate the thermal fluctuation caused by the pump laser in the microcavity [35]- [37]. Both the pump laser and the auxiliary laser are amplified by erbium doped fiber amplifiers (EDFA)s. The power of the auxiliary laser is set around 350mW , which is almost four times higher than the power of the pump laser (∼ 100mW) because the Q factor is twice difference between the pump and auxiliary optical modes [35], [38].…”

Section: Experimental Setup and Characterizationmentioning

confidence: 99%

Fast Spectroscopy Based on a Modulated Soliton Microcomb

Niu

Wan

et al. 2021

IEEE Photonics J.

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Dissipative Kerr solitons (DKS)s offer an integrated platform for broad spectrum coverage, which is suitable for the high sensitivity spectroscopy. However, the large linespacing of the soliton comb limits the spectroscopy detection resolution. We overcome this limitation by modulating the soliton comb lines through an external EOM with a tunable RF source. By locking the pump laser to a reference cavity, the linewidth of the pump laser was compressed from 1.13 MHz to 72 kHz, leading to the silimar linewidth of comb lines and showing a frequency resolution of hundreds of kHz. Based on the scanned microcomb, we measured the absorption spectra of a gas cell and the high-Q optical modes in the microcavity, with a fast scanning speed of 16GHz/µs. The scanning comb allows the spectroscopy measurement to cover the whole comb mode spectrum over THz bandwidth. Our setup holds great potential for simple, robust spectroscopy measurement.

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Terabit optical OFDM superchannel transmission via coherent carriers of a hybrid chip-scale soliton frequency comb

Cited by 51 publications

References 20 publications

Soliton bursts and deterministic dissipative Kerr soliton generation in auxiliary-assisted microcavities

Soliton bursts and deterministic dissipative Kerr soliton generation in auxiliary-assisted microcavities

Coherent optical communications using coherence-cloned Kerr soliton microcombs

Fast Spectroscopy Based on a Modulated Soliton Microcomb

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