Lawrence Trask

University of Central Florida

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Peter J. Delfyett

University of Central Florida

Srinivas Varma Pericherla

University of Central Florida

Chinmay Shirpurkar

University of Central Florida

Ricardo Bustos-Ramirez

University of Central Florida

Scott B. Papp

National Institute of Standards and Technology

Gloria E. Hoefler

Infinera (United States)

Ashish Bhardwaj

Infinera (United States)

Travis C. Briles

National Institute of Standards and Technology

Jordan R. Stone

National Institute of Standards and Technology

Su‐Peng Yu

University of Colorado Boulder

Cooperative Institutions

Stanford University

University of Southern California

University of California, Santa Barbara

National Institute of Standards and Technology

University of Central Florida

University of Colorado Boulder

Physical Measurement Laboratory

Southern California University for Professional Studies

California Institute of Technology

Joint Quantum Institute

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Direct chip-scale optical frequency divider via regenerative harmonic injection locking

Optics Letters (2021)

Ricardo Bustos-Ramirez Lawrence Trask Ashish Bhardwaj Gloria E. Hoefler Fred Kish

A novel optical frequency division technique, called regenerative harmonic injection locking, is used to transfer the timing stability of an optical frequency comb with a repetition rate in the millimeter wave range ( ∼ 300 G H z ) to a chip-scale mode-locked laser with a ∼ 10 G H z repetition rate. By doing so, the 300 GHz optical frequency comb is optically divided by a factor of 30 × to 10 GHz. The stability of the mode-locked laser after regenerative harmonic injection locking is ∼ 10 − 12 at 1 s with a 1 / τ trend. To facilitate optical frequency division, a coupled opto-electronic oscillator is implemented to assist the injection locking process. This technique is exceptionally power efficient, as it uses less than 100 µ W of optical power to achieve stable locking.

Injection locking

Regenerative amplification

Mode-Locking

Harmonic

10.1364/ol.413335

Cite

Citations (5)

Inverse-designed multi-dimensional silicon photonic transmitters

arXiv (Cornell University) (2021)

Ki Youl Yang Alexander D. White Farshid Ashtiani Chinmay Shirpurkar Srinivas V. Pericherla

Modern microelectronic processors have migrated towards parallel computing architectures with many-core processors. However, such expansion comes with diminishing returns exacted by the high cost of data movement between individual processors. The use of optical interconnects has burgeoned as a promising technology that can address the limits of this data transfer. While recent pushes to enhance optical communication have focused on developing wavelength-division multiplexing technology, this approach will eventually saturate the usable bandwidth, and new dimensions of data transfer will be paramount to fulfill the ever-growing need for speed. Here we demonstrate an integrated intra- and inter-chip multi-dimensional communication scheme enabled by photonic inverse design. Using inverse-designed mode-division multiplexers, we combine wavelength- and mode- multiplexing and send massively parallel data through nano-photonic waveguides and optical fibres. Crucially, as we take advantage of an orthogonal optical basis, our approach is inherently scalable to a multiplicative enhancement over the current state of the art.

USable

10.48550/arxiv.2103.14139

Cite

Citations (8)

Self-Oscillating, Self-Stabilizing, and Self-Referenced Electro-Optic Comb

Optics Express (2025)

Lawrence Trask Srinivas Varma Pericherla Peter J. Delfyett

We demonstrate a widely spaced, stabilized, and self-referenced opto-electronic oscillator driven electro-optic modulator based optical frequency comb. Using an ultra-stable Fabry-Perot etalon as a stable reference, we simultaneously stabilize a CW laser and generate a low noise and stable RF oscillation used to drive an electro-optic comb. In such a manner, the Fabry-Perot etalon pins both the carrier-envelope-offset frequency ( f ceo ) and the repetition rate of the comb in place ( f rep ), eliminating the need for an external RF oscillator. Usage of the ultra-stable Fabry-Perot etalon as both an optical and RF reference allows the removal of an external RF oscillator. Additionally, we determined the key parameters in producing high contrast ultrashort pulses necessary for coherent octave spanning supercontinuum generation using long and weak pulses associated with electro-optic modulator based combs. By using a monolithically fiber based pulse compression scheme, we produced ultrashort pulses to facilitate measuring the carrier-envelope-offset frequency, allowing for the first self-starting, self-stabilized, and self-referenced opto-electronic oscillator driven electro-optic modulator based optical frequency comb.

10.1364/oe.535014

Cite

Citations (0)

Multi-dimensional data transmission using inverse-designed silicon photonics and microcombs

Nature Communications (2022)

Ki Youl Yang Chinmay Shirpurkar Alexander D. White Jizhao Zang Lin Chang

The use of optical interconnects has burgeoned as a promising technology that can address the limits of data transfer for future high-performance silicon chips. Recent pushes to enhance optical communication have focused on developing wavelength-division multiplexing technology, and new dimensions of data transfer will be paramount to fulfill the ever-growing need for speed. Here we demonstrate an integrated multi-dimensional communication scheme that combines wavelength- and mode- multiplexing on a silicon photonic circuit. Using foundry-compatible photonic inverse design and spectrally flattened microcombs, we demonstrate a 1.12-Tb/s natively error-free data transmission throughout a silicon nanophotonic waveguide. Furthermore, we implement inverse-designed surface-normal couplers to enable multimode optical transmission between separate silicon chips throughout a multimode-matched fibre. All the inverse-designed devices comply with the process design rules for standard silicon photonic foundries. Our approach is inherently scalable to a multiplicative enhancement over the state of the art silicon photonic transmitters.

Nanophotonics

10.1038/s41467-022-35446-4

Cite

Citations (75)

Optical Frequency Division & Pulse Synchronization Using a Photonic-Crystal Microcomb Injected Chip-Scale Mode-Locked Laser

Journal of Lightwave Technology (2023)

Chinmay Shirpurkar Jizhao Zang Ricardo Bustos-Ramirez David R. Carlson Travis C. Briles

A mode-locked laser photonic integrated circuit with a repetition rate of 10 GHz is optically synchronized to a tantala-based photonic crystal resonator comb with a repetition rate of 200 GHz. The synchronization is achieved through regenerative harmonic injection locking using a coupled optoelectronic oscillator loop resulting in an optical frequency division factor of 20. The repetition rate of the photonic crystal resonator comb is stabilized and locked through electro-optic division. This stability is transferred to the mode-locked laser where we measure a fractional frequency instability of

$8\times 10^{-11}$

at an averaging time of 10 s for the repetition rate signal of the mode-locked laser. Furthermore, we also measure the near carrier phase noise of the pulse repetition rate and estimate the integrated rms timing jitter of the pulses to be 6 ps.

10.1109/jlt.2023.3304605

Cite

Citations (1)

Synchronization of a mm-Wave frequency comb to a chipscale mode-locked laser via harmonic injection locking

Conference on Lasers and Electro-Optics (2020)

Ricardo Bustos-Ramirez Lawrence Trask Ashish Bhardwaj Gloria E. Hoefler Fred Kish

A mm-Wave frequency comb with 240GHz spacing is synchronized to a MLL-PIC using harmonic injection locking, this represent optical frequency division of 24x. The Allan Deviation on the repetition rate stability is 10 -10 at 1s.

Injection locking

Harmonic

Frequency deviation

Comb generator

Mode-Locking

Phase locking

Allan variance

Repetition (rhetorical device)

Harmonic Analysis

10.1364/cleo_si.2020.sm1h.4

Cite

Citations (0)

Stabilization of an InP Mode-Locked Laser PIC Through Simultaneous Optical Filtering and Self-Injection Locking Using a Fabry-Perot Etalon

Journal of Lightwave Technology (2024)

Srinivas Varma Pericherla Lawrence Trask Chinmay Shirpurkar Ashish Bhardwaj Gloria E. Hoefler

We report experimental studies of a self-injection locking technique with optically filtered feedback and its influence on optical linewidth, RF linewidth, carrier side-band suppression and frequency stability of a monolithically integrated InP passive mode-locked laser. We use a Fabry-Perot etalon as the photonic filter placed in an external fiber feedback loop for filtering the mode-locked laser output and subsequently self-injection locking. Using this technique, we demonstrate optical axial mode linewidth narrowing by a factor of 100x from 600 MHz to 6 MHz, while improving the RF linewidth by a factor of 50x from 109 kHz to 2.2 kHz. The external cavity modes arising from the fiber feedback loop were suppressed by 20 dB, while the phase noise at 200 kHz offset from the carrier is suppressed by 35 dB. Finally, we implement a coupled optoelectronic loop by using the photo-detected output from the self-injection locked laser and provide feedback to drive the integrated electro-absorption modulator in the laser cavity. The coupled optoelectronic loop is referenced to an external RF source to transfer the stability and further improve the noise performance of the self-injection locked laser. The Allan deviation at 10 s averaging time is 5 x 10 ^-12 , showing an improvement of 5 orders of magnitude over passive mode-locking operation.

Laser linewidth

Injection locking

Mode-Locking

10.1109/jlt.2024.3366092

Cite

Citations (1)

Inverse-designed multi-wavelength, multi-mode optical interconnects using soliton microcombs

Conference on Lasers and Electro-Optics (2022)

Kailu Yang Alexander D. White Farshid Ashtiani Chinmay Shirpurkar Srinivas Varma Pericherla

We demonstrate 130 Gbps transmission in each of 4 spatial modes using Si 3 N 4 soliton microcombs and inverse-designed silicon mode multiplexers. Out of 52 carriers, 42 data channels show natively error-free data transmission.

Mode (computer interface)

10.1364/cleo_si.2022.sth4j.1

Cite

Citations (0)

Low Noise Self-Oscillating Filtered Electro-Optic Modulated Comb Generation

Lawrence Trask Srinivas Varma Pericherla Peter J. Delfyett

We demonstrate an alternative architecture for generating low-noise, terahertz spanning, optically filtered electro-optic modulated combs without an external RF drive signal. Results demonstrate a 70 dB OSNR and RF SNR > 90 dB at 10.5 GHz.

Comb filter

10.1364/cleo_si.2024.sf3d.6

Cite

Citations (0)

Broadband Electro-Optic Comb Generation using a Stable and Low Noise Photonically Filtered Optoelectronic Oscillator

2022 IEEE Photonics Conference (IPC) (2023)

Lawrence Trask Srinivas Varma Pericherla Chinmay Shirpurkar Peter J. Delfyett

We present an improved architecture for generating low noise, terahertz spanning, optically filtered electro-optic modulated combs without an external RF drive signal. Results demonstrate an OSNR > 50 dB, RF SNF > 90 dB at 10.5 GHz, and a minimum fractional frequency stability of 2.5x10 ^-11 .

SIGNAL (programming language)

10.1109/ipc57732.2023.10360683

Cite

Citations (0)