#### IEEE Photonics Technology Letters

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ISSN / EISSN : 1041-1135 / 1941-0174
Total articles ≅ 18,696
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Christina Lim, Zetian Mi, Weidong Zhou, Dominique Dagenais
Published: 28 July 2021
IEEE Photonics Technology Letters, Volume 33, pp 803-803; doi:10.1109/lpt.2021.3092475

Abstract:
We are pleased to serve as the Guest Editors of this Special Issue on IEEE Photonics Conference 2020 (IPC2020), published by the IEEE Photonics Technology Letters journal. The IEEE Photonics Conference (IPC) is the flagship conference of the IEEE Photonics Society and serves as a prominent meeting for the members and the broad photonics community. IPC2020 took place from September 28 to October 1, 2020. The technical program encompasses areas from biophotonics, nanophotonics, silicon photonics, microwave photonics, quantum photonics, photonics material, photonics devices, linear and nonlinear photonics, optical communications, and optical interconnects.
Minkyu Kim, Youngkwan Jo, Stefan Lischke, Christian Mai, Lars Zimmermann,
Published: 27 July 2021
IEEE Photonics Technology Letters, pp 1-1; doi:10.1109/lpt.2021.3098760

Abstract:
We present a large-signal SPICE model for the depletion-type silicon ring (RM) modulator that includes temperature dependence. The model is based on the temperature-dependent equivalent circuit for the RM and allows easy simulation of RM modulation characteristics in SPICE. The accuracy of the model is verified with the measurement results of 25-Gb/s NRZ modulation at several different temperatures. In addition, simulation of the temperature-dependent transient responses of the RM together with the RM temperature control circuit is demonstrated in the standard IC design environment.
Jiongshen Pan, Tiansheng Huang, Yuchen Ge, Wenfu Lin,
Published: 27 July 2021
IEEE Photonics Technology Letters, pp 1-1; doi:10.1109/lpt.2021.3100366

Abstract:
In this work, an optical microfiber-based hybrid interferometer is presented. A combination of two types of in-line Mach-Zehnder interferometers is achieved by inserting a section of nonadiabatic tapered polarization maintaining microfiber into a Lyot filter. The hybrid interference spectrum shown as large spectrum envelope and fine fringes, corresponding to the polarized and modal interferences is obtained. We experimentally investigate the response characteristics of the two-interference system using both spectral interrogation and spatial frequency domain analysis. The refractive index sensitivities are 1150.0nm/RIU and 1779.8nm/RIU, and the temperature sensitivities are 190pm/°C and -12.7 pm/°C for two interferences, respectively. The proposed hybrid interferometer has the advantages of simple device and compact structure, and has the potential of simultaneous measurement of multiple parameters.
Karl Hausler, Ralf Staske, Andre Maasdorf, Peter Ressel, Christoph Stolmacker, Gunther Trankle, Paul Crump
Published: 26 July 2021
IEEE Photonics Technology Letters, pp 1-1; doi:10.1109/lpt.2021.3099998

Abstract:
Laser diode benches (LDBs) with lasing wavelength of 808 nm were developed, manufactured and endurance-tested for utilization as pump lasers for the Nd:YAG oscillator in the cli-mate satellite MERLIN. The LDBs combine customized TE-polarized GaAs-based 5-mm minibars with fast axis collimation lenses to produce a reliable, space qualified component at optical power of 63 W per minibar. Accelerated life tests of 20 LDBs are presented. Except for a small increase in threshold current, no wear out in operating current or sudden failures were observed, and reliable operation over the full mission time of > 4 gigashots was confirmed. The electro-optical characteristics remain in the specified ranges after exposure to the total operational load of the mission.
Published: 26 July 2021
IEEE Photonics Technology Letters, Volume 33, pp 747-748; doi:10.1109/lpt.2021.3087989

Abstract:
Aritra Roy, , Tomasz Piwonski
Published: 19 July 2021
IEEE Photonics Technology Letters, Volume 33, pp 896-899; doi:10.1109/lpt.2021.3098418

Abstract:
The use of Optical Coherence Tomography in the field of clinical diagnosis is significant. There are different types of swept source lasers available on the market today, however, their design and associated complex fabrication process increase their cost. In the work presented here, an economical six-section slotted tunable laser operating near 850 nm has been designed and fabricated using a UV optical lithography process. The laser is monolithically integrable without a need for any regrowth step. Initial characterization has confirmed the high quality of the slot geometry and stable single mode operation within its tuning range.
Xianglei Yan, Wei Pan, , Bing Lu, , Bin Luo
Published: 15 July 2021
IEEE Photonics Technology Letters, Volume 33, pp 792-795; doi:10.1109/lpt.2021.3097369

Abstract:
We propose and experimentally demonstrate digitally programmable optical frequency combs (OFCs), featured by binary phase distribution and flat power envelope among comb lines for the first time. In the proposed simple generation scheme, a programmable optimized binary sequence is generated and applied to phase modulate a CW lightwave, creating an OFC with joint manipulation of both binary phase distribution and flat power envelope. Moreover, by digitally programing of the binary sequence, the generated OFC shows high tunability on comb spacing and comb-line number. In the experiments, tunable comb spacing of 20, 10, 5, 2 MHz and tunable comb-line number of 21, 51, 101 are demonstrated, while retaining excellent binary phase and flat power envelope. Such an agile joint manipulation of both phase and power paves a new way for promising phase-correlated applications of OFCs, such as the covert communications and weak signal detection.
Li-Yuan Chiang, , Steve Pappert, Paul K. L. Yu
Published: 14 July 2021
IEEE Photonics Technology Letters, Volume 33, pp 796-799; doi:10.1109/lpt.2021.3097202

Abstract:
An ultralow- $\text{V}_{\pi }\text{L}$ photonic switch device is demonstrated utilizing the high optical and electrical field confinement in silicon slot waveguides coupled with the strong electro-optic response of nematic liquid crystals. A silicon photonic directional coupler switch with a modulation efficiency of 0.0195 $\text{V}\cdot$ mm and a loss-efficiency product of 0.0624 $\text{V}\cdot$ dB is achieved. The 1.5 mm long device is based on two-mode interference within a single slot waveguide resulting in a $\text{V}_{\mathrm {\pi }}$ of 0.013 V and an extinction ratio of $\sim ~9$ dB at 1550 nm wavelength. The power consumption of the photonic switch is estimated to be below 0.6 nW and it possesses a response time of < 1.5 ms. A comparative performance study between the directional coupler switch and a Mach-Zehnder Interferometer (MZI) switch is performed. The directional coupler switch is projected to have a smaller footprint and lower optical loss compared to a similar design MZI switch making it a strong candidate for switch matrix designs and applications.
Published: 12 July 2021
IEEE Photonics Technology Letters, Volume 33, pp 685-686; doi:10.1109/lpt.2021.3087984

Abstract:
The coherent temporal soliton in optical microresonators has attracted great attention recently. Here, we have fabricated the microrod resonator with Q factor as high as $2\times 10^{8}$ and demonstrated the dissipative Kerr soliton generation in such a microresonator, by utilizing an auxiliary-laser-assisted thermal response control. In addition, we have changed the pump laser and observed the perfect soliton crystals. With the simulation, we found that the perfect soliton crystals are generated based on the avoided mode crossing, which is affected by the pump resonance and pump power.