Integrated flexible-grid WDM transmitter using an optical frequency comb in microring modulators

Xu, Yin; Lin, Jintong; Dubé-Demers, Raphaël; LaRochelle, Sophie; Rusch, Leslie A.; Shi, Wei

doi:10.1364/ol.43.001554

Cited by 30 publications

(21 citation statements)

References 13 publications

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“…Bandwidth densities of over 1 Tb/s/ mm 2 have been demonstrated using WDM MRM hybrids integrated with 14 nm FinFET [161]. In addition, MRMs can work simultaneously as MUX and modulators, thus greatly simplifying WDM transmitters [162,163]. However, resonator modulators suffer from impairments such as strong nonlinearity and chirp [160,164].…”

Section: Ultracompact Low-power Devicesmentioning

confidence: 99%

“…applications include arrayed waveguide gratings (AWGs) [211][212][213][214], echelle gratings (EGs) [215], cascaded MZIs [216], microring resonators (MRRs) [163,217,218], and Bragg grating filters such as contradirectional couplers [176,219]. AWGs, EGs, and cascaded MZIs are classified as finite impulse response (FIR) filters, which split input light to dispersive paths and recombine them at different outputs with regard to wavelength.…”

Section: Wavelength (De)multiplexersmentioning

confidence: 99%

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Scaling capacity of fiber-optic transmission systems via silicon photonics

2020

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The tremendous growth of data traffic has spurred a rapid evolution of optical communications for a higher data transmission capacity. Next-generation fiber-optic communication systems will require dramatically increased complexity that cannot be obtained using discrete components. In this context, silicon photonics is quickly maturing. Capable of manipulating electrons and photons on the same platform, this disruptive technology promises to cram more complexity on a single chip, leading to orders-of-magnitude reduction of integrated photonic systems in size, energy, and cost. This paper provides a system perspective and reviews recent progress in silicon photonics probing all dimensions of light to scale the capacity of fiber-optic networks toward terabits-per-second per optical interface and petabits-per-second per transmission link. Firstly, we overview fundamentals and the evolving trends of silicon photonic fabrication process. Then, we focus on recent progress in silicon coherent optical transceivers. Further scaling the system capacity requires multiplexing techniques in all the dimensions of light: wavelength, polarization, and space, for which we have seen impressive demonstrations of on-chip functionalities such as polarization diversity circuits and wavelength- and space-division multiplexers. Despite these advances, large-scale silicon photonic integrated circuits incorporating a variety of active and passive functionalities still face considerable challenges, many of which will eventually be addressed as the technology continues evolving with the entire ecosystem at a fast pace.

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Section: Ultracompact Low-power Devicesmentioning

confidence: 99%

Section: Wavelength (De)multiplexersmentioning

confidence: 99%

Scaling capacity of fiber-optic transmission systems via silicon photonics

2020

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“…While bandwidth scaling of comb lines using multiple nearly identical cascaded ring modulators has been attempted in [21], the proposed technique makes use of thermo-optic heaters additionally to compensate for fabrication variations of the individual ring modulators and tune the locations of the interleaving harmonics generated in order to align to neighboring resonances of other ring modulators, which then generate harmonics of their own to form a multiwavelength source. Such an approach to bandwidth scaling requires heater feedback stabilization as well as the use of phase referenced two-tone drive, in multiples of the desired comb repetition rate in contrast to the technique described in this paper.…”

Section: Application-2: Bandwidth Scaling Through Cascading Ring Modumentioning

confidence: 99%

“…Alternately, a more compact implementation can be realized using silicon based PN doped microring modulators [20][21][22]. Microring modulators are commonly used in on-chip silicon transceiver systems for wavelength selective data modulation and demodulation operations.…”

Section: Introductionmentioning

confidence: 99%

Microwave power induced resonance shifting of silicon ring modulators for continuously tunable, bandwidth scaled frequency combs

Nagarjun¹,

Raj²,

Jeyaselvan³

et al. 2020

Opt. Express

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We demonstrate a technique to continuously tune center frequency and repetition rate of optical frequency combs generated in silicon microring modulators and bandwidth scale them. We utilize a drive frequency dependent, microwave power induced shifting of the microring modulator resonance. In this work, we demonstrate center frequency tunability of frequency combs generated in silicon microring modulators over a wide range (∼8nm) with fixed number of lines. We also demonstrate continuously tunable repetition rates from 7.5GHz to 15GHz. Further, we use this effect to demonstrate a proof-of-principle experiment to bandwidth scale an 8-line (20dB band) comb generated from a single ring modulator driven at 10GHz to a comb with 12 and 15 lines by cascading two and three ring modulators, respectively. This is accomplished by merging widely spaced ring modulator resonances to a common location, thus coupling light simultaneously into multiple cascaded ring modulators.

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“…Combs with few lines were generated using all-silicon modulators in the following configurations: a single phase modulator (PM) [12], dual-parallel MZMs [13], a single microring modulator (MRM) [14,15] and cascaded MRMs [16]. Integration of an on-chip MRM comb generation and data modulation was recently demonstrated [16]. Compared to MZM solutions, a single PM based comb generation has less flexibility to achieve a flat output.…”

Section: Introductionmentioning

confidence: 99%

Frequency Comb Generation Using a CMOS Compatible SiP DD-MZM for Flexible Networks

Lin

Sepehrian

et al. 2018

IEEE Photon. Technol. Lett.

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On-chip frequency comb generation is a promising solution for seeding a chip-scale optical transmitter for both Nyquist wavelength-division multiplexing (WDM) and orthogonal frequency-division multiplexing. We demonstrate flexible frequency comb generation using a silicon photonic dual-drive Mach-Zehnder modulator fabricated on a CMOS-compatible process. Our on-chip comb has five lines spaced at 20 GHz, with a high tone-to-noise ratio of about 40 dB after one stage optical amplification. Our back-to-back transmission achieves bit error rates (BERs) well below 2e-2, the threshold for 20% overhead forward error correction (FEC), for 800 Gb/s using 16 Gbaud 32QAM on five WDM channels. We also test a seamless 800 Gb/s super-channel using 5×20 Gbaud 16QAM, with BER below the 7% overhead FEC threshold of 3.8e-3. To the best of our knowledge, this is the first demonstration of high-spectralefficiency data carried by an all-silicon optical frequency comb. This establishes that a silicon optical frequency comb has sufficient optical signal to noise ratio for high order QAM, as well as excellent stability for super-channels without guard bands, paving the way to an integrated high-spectral-efficiency multi-carrier optical transmitter.

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Integrated flexible-grid WDM transmitter using an optical frequency comb in microring modulators

Cited by 30 publications

References 13 publications

Scaling capacity of fiber-optic transmission systems via silicon photonics

Scaling capacity of fiber-optic transmission systems via silicon photonics

Microwave power induced resonance shifting of silicon ring modulators for continuously tunable, bandwidth scaled frequency combs

Frequency Comb Generation Using a CMOS Compatible SiP DD-MZM for Flexible Networks

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