Generation of tunable, high repetition rate optical frequency combs using on-chip silicon modulators

Nagarjun, K. P.; Jeyaselvan, Vadivukarassi; Selvaraja, Shankar Kumar; Supradeepa, V. R.

doi:10.1364/oe.26.010744

Cited by 26 publications

(11 citation statements)

References 20 publications

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“…The instantaneous frequency of the electric field is thus periodically oscillating at the repetition rate f REP . The corresponding spectrum therefore contains a set of discrete frequency lines, separated by the modulation frequency [43]. Indeed, if we consider an electric field E IN at the input of a phase modulator, oscillating at the angular frequency ω 0 , it can be expressed as:…”

Section: Heterodyne Detection Of Frequency Combs From Si Eofc Generatormentioning

confidence: 99%

“…Values of tens to hundreds of GHz are achieved for the microcombs [4,[6][7][16][17][24][25][26][27][33][34][35], while the repetition rate of fiber laser-based combs are on the orders of tens or hundreds of MHz [3][4][16][17][19][20][21][22]. On the contrary, using EOFCs the repetition rate is fully tunable within the modulator electro-optic bandwidth, up to tens of GHz [3][4][8][9][10][11][12]16,[28][29][30][31][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

“…High speed depletion-based silicon electro-optical modulators have shown robust performance in telecommunications for many years [56]. However the use of silicon modulator to generate EOFC is still sparse [10][11][12][41][42][43][44][45].…”

Section: Introductionmentioning

confidence: 99%

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Frequency-tuning dual-comb spectroscopy using silicon Mach-Zehnder modulators

et al. 2020

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Dual-comb spectroscopy using a silicon Mach-Zehnder modulator is reported for the first time. First, the properties of frequency combs generated by silicon modulators are assessed in terms of tunability, coherence, and number of lines. Then, taking advantage of the frequency agility of electro-optical frequency combs, a new technique for fine resolution absorption spectroscopy is proposed, named frequency-tuning dual-comb spectroscopy, which combines dual-comb spectroscopy and frequency spacing tunability to measure optical spectra with detection at a unique RF frequency. As a proof of concept, a 24 GHz optical bandwidth is scanned with a 1 GHz resolution.

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Section: Heterodyne Detection Of Frequency Combs From Si Eofc Generatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Frequency-tuning dual-comb spectroscopy using silicon Mach-Zehnder modulators

et al. 2020

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“…In our previous work [15,16] we proposed and experimentally realized on-chip frequency comb generation using large signal modulation of an optical carrier in linear charge injection based silicon modulators. Frequency combs generated in such devices are attractive since they are easily integrated with pre-existing silicon photonics components without additional coupling losses, have continuously tunable center frequency and repetition rate and are CMOS fabrication compatible etc.…”

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].…”

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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Generation of tunable, high repetition rate optical frequency combs using on-chip silicon modulators

Cited by 26 publications

References 20 publications

Frequency-tuning dual-comb spectroscopy using silicon Mach-Zehnder modulators

Frequency-tuning dual-comb spectroscopy using silicon Mach-Zehnder modulators

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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