Search Results - Jianji Dong
-
1
Tunable Image Rotator of Light With Optical Geometric Transformation
Published 2016-01-01Get full textThe traditional method to rotate an image of light is by using a Dove prism, even though it is unreliable, owing to the mechanical adjustment when a tunable image rotation is required. Here, we propose a flexible and nonmechanical scheme to rotate an optical image by an arbitrary angle with optical...
Article -
2
Measurement of Orbital Angular Momentum by Self-Interference Using a Plasmonic Metasurface
Published 2016-01-01Get full textWe present a flexible method for measuring the orbital angular momentum (OAM) of a linearly polarized beam by means of a metasurface composed of a V-shaped gold plasmonic antenna. When a linearly polarized OAM light illuminates the metasurface, the ordinary beam with the same polarization and topolo...
Article -
3
Separation of Rectangularly Symmetric Modes of Light With Fan-Out Elements
Published 2019-01-01Get full textWe present a method to efficiently separate the rectangularly symmetric modes of light with two phase-only holograms. The holograms, known as fan-out elements, can split the input modes into multiple copies. A subsequent lens focuses these modes to different lateral positions. We use two spatial lig...
Article -
4
Photonic Multiple Microwave Frequency Measurement Based on Frequency-to-Time Mapping
Published 2018-01-01Get full textA photonic multiple microwave frequency measurement system is presented and demonstrated based on a swept frequency silicon microring resonator (MRR). The drop-port of a high-Q MRR is employed as a periodic narrowband scanning filter driven by a sawtooth voltage signal. The unknown frequency can be...
Article -
5
Orbital Angular Momentum Divider of Light
Published 2017-01-01Get full textManipulation of orbital angular momentum (OAM) of light is essential in OAM-based optical systems. In particular, the OAM divider, which can convert the incoming OAM mode into one or several new smaller modes in proportion at different spatial paths, is very useful in OAM-based optical networks. How...
Article -
6
Switchable Microwave Photonic Filter Between Low-Pass and High-Pass Responses
Published 2016-01-01Get full textA novel and simple microwave photonic filter (MPF) is proposed and experimentally demonstrated. The MPF can be switched between low-pass and high-pass frequency responses. The MPF is realized by using an electro-optic phase modulator (EOPM) and two cascaded tunable optical bandpass filters (TOBFs)....
Article -
7
A Tunable Single Passband Microwave Photonic Filter of Overcoming Fiber Dispersion Induced Amplitude Fading
Published 2017-01-01Get full textA tunable single passband microwave photonic filter (MPF) of overcoming fiber dispersion induced amplitude fading of the microwave passband is proposed and demonstrated. The passband amplitude of the MPF can be kept invariant for different central frequencies. The scheme is realized based on a dual-...
Article -
8
Frequency-Hopping Microwave Generation With a Large Time-Bandwidth Product
Published 2018-01-01Get full textWe propose and demonstrate an approach to generating large time-bandwidth product (TBWP) frequency-hopping (FH) microwave waveforms by using an ultra-high-quality factor (Q) silicon microring resonator (MRR) with thermal tuning. An ultra-high-Q MRR (Q ∼ 10<sup>6</sup>) is used...
Article -
9
Analytic Theory for Parametric Amplification in High-Q Micro-Ring Resonators
Published 2023-01-01Get full textOptical parametric amplifiers (OPAs) are optical amplifiers based on four-wave mixing processes, showing great potential for applications in communications, optical signal processing, quantum optics, etc. In recent years, significant progress has been made to integrated OPAs based on highly nonlinea...
Article