J. Semicond. > 2021, Volume 42 > Issue 4 > 041307

REVIEWS

Latest advances in high-performance light sources and optical amplifiers on silicon

Songtao Liu1, and Akhilesh Khope2

+ Author Affiliations

 Corresponding author: Songtao Liu, stliu.photonics@gmail.com, stliu7963@gmail.com

DOI: 10.1088/1674-4926/42/4/041307

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Abstract: Efficient light generation and amplification has long been missing on the silicon platform due to its well-known indirect bandgap nature. Driven by the size, weight, power and cost (SWaP-C) requirements, the desire to fully realize integrated silicon electronic and photonic integrated circuits has greatly pushed the effort of realizing high performance on-chip lasers and amplifiers moving forward. Several approaches have been proposed and demonstrated to address this issue. In this paper, a brief overview of recent progress of the high-performance lasers and amplifiers on Si based on different technology is presented. Representative device demonstrations, including ultra-narrow linewidth III–V/Si lasers, fully integrated III–V/Si/Si3N4 lasers, high-channel count mode locked quantum dot (QD) lasers, and high gain QD amplifiers will be covered.

Key words: III–V/Si photonic integrated circuitssemiconductor laserssemiconductor amplifierquantum dots



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Fig. 1.  (Color online) (a) Evolution of photonic integration in terms of the number of devices in a single PIC. Silicon photonic integration (red circle) represents the “passive” integration without an on-chip laser solution; InP integration (blue squares) and heterogeneous silicon integration (green triangle) are solutions with on-chip lasers[6]. (b) Schematic of the heterogeneous platform commercialized by Intel[10].

Fig. 2.  (Color online) High-Q heterogeneous laser device schematics (not to scale). (a) Two-dimensional cross-section of the heterogeneous platform, with superimposed optical transverse mode profile. (b) Perspective view of a high-Q heterogeneous laser. (c) Perspective view of the high-Q silicon resonator[27]. (d) Frequency noise spectral density for three high-Q heterogeneous lasers (with different spacer thickness) and control laser[30].

Fig. 3.  (Color online) (a) High-Q widely tunable heterogeneous quad-ring tunable laser device schematics (not to scale). (b) Coarse tuning spectra showing the tuning range of 120 nm. (c) Frequency noise spectrum of the fabricated quad-ring mirror laser. A white noise level of 45 Hz2/Hz is drawn[24].

Fig. 4.  (Color online) (a) III–V/Si/Si3N4 laser schematic diagram. (b) Si–Si3N4 taper as well as the simulated mode profile. (c) Single-mode optical spectrum with gain current of 160 mA. The inset shows measured normalized reflection spectra of the Si3N4 spiral grating[36].

Fig. 5.  (Color online) (a) Schematic illustration of the typical epitaxial structure used for lasers and amplifiers including one period of the p-modulation doped active region and the III–V/Si buffer including defect filter layers and thermal cycle annealing (TCA) to reduce dislocation densities. (b) As-grown photoluminescence spectra for quantum dot lasers on GaAs and Si substrates[47].

Fig. 6.  (Color online) (a) Schematic diagram of the 20 GHz quantum dot mode-locked laser on silicon (not to scale). (b) Optical spectrum and corresponding optical linewidth of each mode within 10 dB. (c) Relative intensity noise of the whole O-band spectrum and certain filtered individual wavelength channels. (d) BER performance of the PAM-4 signal with different comb lines[60].

Fig. 7.  (Color online) Si-based QD-SOA (a) on-chip gain (TE polarization) mapping as a function of on-chip input power and wavelength at 20 °C. (b) On-chip small signal gain as a function of wavelength. (c) On-chip output power as a function of on-chip input power. (d) Wall-plug efficiency as a function of on-chip input power[59]. (e) Bit error rate (BER) against the received optical power for the optical receiver (PD+TIA) with and without QD-SOA under 20 °C, eye diagrams of the receiver with and without QD-SOA are shown in the insets[85].

[1]
Rahim A, Spuesens T, Baets R, et al. Open-access silicon photonics: Current status and emerging initiatives. Proc IEEE, 2018, 106, 2313 doi: 10.1109/JPROC.2018.2878686
[2]
Pinguet T, Denton S, Gloeckner S, et al. High-volume manufacturing platform for silicon photonics. Proc IEEE, 2018, 106, 2281 doi: 10.1109/JPROC.2018.2859198
[3]
Chen X, Milosevic M M, Stanković S, et al. The emergence of silicon photonics as a flexible technology platform. Proc IEEE, 2018, 106, 2101 doi: 10.1109/JPROC.2018.2854372
[4]
Glick M, Abrams N C, Cheng Q X, et al. PINE: photonic integrated networked energy efficient datacenters (ENLITENED program). J Opt Commun Netw, 2020, 12, 443 doi: 10.1364/JOCN.402788
[5]
Poulton C V, Byrd M J, Moss B, et al. Element optical phased array with 100° steering range and flip-chip CMOS. Conference on Lasers and Electro-Optics, 2020, JTh4A.3
[6]
Komljenovic T, Huang D N, Pintus P, et al. Photonic integrated circuits using heterogeneous integration on silicon. Proc IEEE, 2018, 106, 2246 doi: 10.1109/JPROC.2018.2864668
[7]
Adoption of silicon photonics is reaching an inflection point. https://www.lightcounting.com/light-trends/adoption-silicon-photonics-reaching-inflection-point/#:~:text=Many in the industry have, such transitions is most challenging
[8]
Liang D, Bowers J E. Recent progress in lasers on silicon. Nat Photonics, 2010, 4, 511 doi: 10.1038/nphoton.2010.167
[9]
Fang A W, Park H, Cohen O, et al. Electrically pumped hybrid AlGaInAs-silicon evanescent laser. Opt Express, 2006, 14, 9203 doi: 10.1364/OE.14.009203
[10]
Jones R, Doussiere P, Driscoll J B, et al. Heterogeneously integrated InP\/silicon photonics: Fabricating fully functional transceivers. IEEE Nanotechnol Mag, 2019, 13, 17 doi: 10.1109/MNANO.2019.2891369
[11]
Liu A Y, Bowers J. Photonic integration with epitaxial III–V on silicon. IEEE J Sel Top Quantum Electron, 2018, 24, 6000412 doi: 10.1109/JSTQE.2018.2854542
[12]
Norman J C, Jung D, Wan Y T, et al. Perspective: The future of quantum dot photonic integrated circuits. APL Photonics, 2018, 3, 030901 doi: 10.1063/1.5021345
[13]
Rong H S, Xu S B, Kuo Y H, et al. Low-threshold continuous-wave Raman silicon laser. Nat Photonics, 2007, 1, 232 doi: 10.1038/nphoton.2007.29
[14]
Liu J F, Sun X C, Camacho-Aguilera R, et al. Ge-on-Si laser operating at room temperature. Opt Lett, 2010, 35, 679 doi: 10.1364/OL.35.000679
[15]
Wang Z C, Abbasi A, Dave U, et al. Novel light source integration approaches for silicon photonics. Laser Photonics Rev, 2017, 11, 1700063 doi: 10.1002/lpor.201700063
[16]
Fang A W, Koch B R, Gan K G, et al. A racetrack mode-locked silicon evanescent laser. Opt Express, 2008, 16, 1393 doi: 10.1364/OE.16.001393
[17]
Wang Z C, van Gasse K, Moskalenko V, et al. A III-V-on-Si ultra-dense comb laser. Light: Sci Appl, 2017, 6, e16260 doi: 10.1038/lsa.2016.260
[18]
Zhang C, Srinivasan S, Tang Y, et al. Low threshold and high speed short cavity distributed feedback hybrid silicon lasers. Opt Express, 2014, 22, 10202 doi: 10.1364/OE.22.010202
[19]
Liang D, Huang X, Kurczveil G, et al. Integrated finely tunable microring laser on silicon. Nat Photonics, 2016, 10, 719 doi: 10.1038/nphoton.2016.163
[20]
Komljenovic T, Srinivasan S, Norberg E, et al. Widely tunable narrow-linewidth monolithically integrated external-cavity semiconductor lasers. IEEE J Sel Top Quantum Electron, 2015, 21, 214 doi: 10.1109/JSTQE.2015.2422752
[21]
Kurczveil G, Heck M J R, Peters J D, et al. An integrated hybrid silicon multiwavelength AWG laser. IEEE J Sel Top Quantum Electron, 2011, 17, 1521 doi: 10.1109/JSTQE.2011.2112639
[22]
Zhang C, Zhang S J, Peters J D, et al. 8 × 8 × 40 Gbps fully integrated silicon photonic network on chip. Optica, 2016, 3, 785 doi: 10.1364/OPTICA.3.000785
[23]
Roelkens G, Liu L, Liang D, et al. III-V/silicon photonics for on-chip and intra-chip optical interconnects. Laser Photonics Rev, 2010, 4, 751 doi: 10.1002/lpor.200900033
[24]
Tran M A, Huang D N, Bowers J E. Tutorial on narrow linewidth tunable semiconductor lasers using Si/III-V heterogeneous integration. APL Photonics, 2019, 4, 111101 doi: 10.1063/1.5124254
[25]
Henry C. Theory of the linewidth of semiconductor lasers. IEEE J Quantum Electron, 1982, 18, 259 doi: 10.1109/JQE.1982.1071522
[26]
Davenport M L, Liu S T, Bowers J E. Integrated heterogeneous silicon/III–V mode-locked lasers. Photon Res, 2018, 6, 468 doi: 10.1364/PRJ.6.000468
[27]
Santis C T, Steger S T, Vilenchik Y, et al. High-coherence semiconductor lasers based on integral high-Q resonators in hybrid Si/III-V platforms. Proc Natl Acad Sci USA, 2014, 111, 2879 doi: 10.1073/pnas.1400184111
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    Received: 05 November 2020 Revised: 07 December 2020 Online: Accepted Manuscript: 01 February 2021Uncorrected proof: 07 February 2021Published: 12 April 2021

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      Songtao Liu, Akhilesh Khope. Latest advances in high-performance light sources and optical amplifiers on silicon[J]. Journal of Semiconductors, 2021, 42(4): 041307. doi: 10.1088/1674-4926/42/4/041307 ****S T Liu, A Khope, Latest advances in high-performance light sources and optical amplifiers on silicon[J]. J. Semicond., 2021, 42(4): 041307. doi: 10.1088/1674-4926/42/4/041307.
      Citation:
      Songtao Liu, Akhilesh Khope. Latest advances in high-performance light sources and optical amplifiers on silicon[J]. Journal of Semiconductors, 2021, 42(4): 041307. doi: 10.1088/1674-4926/42/4/041307 ****
      S T Liu, A Khope, Latest advances in high-performance light sources and optical amplifiers on silicon[J]. J. Semicond., 2021, 42(4): 041307. doi: 10.1088/1674-4926/42/4/041307.

      Latest advances in high-performance light sources and optical amplifiers on silicon

      DOI: 10.1088/1674-4926/42/4/041307
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      • Songtao Liu:received his Ph.D. degree in microelectronics and solid state electronics from the University of Chinese Academy of Sciences, Beijing, China, 2017. His research interests are in the field of III–V/silicon photonic integrated circuits, semiconductor lasers, semiconductor physics, optical interconnects, microwave photonics, etc. He is now with Ayar Labs, USA
      • Akhilesh Khope:received his Ph.D. degree in 2019 from UC Santa Barbara, CA, USA, under Prof John Bowers and Prof Adel Saleh in optical switches for data center networks. His research interests are in optical networks, photonic integrated switches and AI. He is now with Microsoft, USA
      • Corresponding author: stliu.photonics@gmail.com, stliu7963@gmail.com
      • Received Date: 2020-11-05
      • Revised Date: 2020-12-07
      • Published Date: 2021-04-10

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