We propose a single-channel photonic compressed sampling scheme. The program is composed of 4 MZMs and each MZM is set at an appropriate working point. The sparse microwave signal is modulated onto an optical carrier coded by a pseudo-random sequence, so that the microwave signal randomly distributed in the broadband range can be measured. The numerical analysis shows that a multi-tone signal in 40 GHz range can be located and reconstructed with 4.2 GHz sampling rate with high probability.
Implement of Kalman scheme for RSOP equalization is investigated from hardware perspective and simulation results show that Kalman scheme is superior to CMA in terms of hardware resources utilization and recovery capacity.
A novel elliptical ring fiber structure mode selective coupler is proposed and it can convert LP01 mode to higher-order modes (LP11a,LP11b,LP21a,LP21b) with the maximum coupling efficiency 99% in wavelength range from 1530nm to1625nm (C+L band).
We propose a novel filterless approach to generate high-quality optical frequency 16-tupling millimeter-wave based on only two MZMs. OSSR higher than 30.34 dB and RFSSR not less than 23.79 dB are achieved in this scheme.
In order to eliminate the error introduced by noise from fixed analyzer method when measuring polarization mode dispersion of optical fiber and improve the accuracy of the polarization mode dispersion measurement system, a novel denoising approach based on wavelet threshold denoising is proposed in this paper. This paper presents the algorithm flow chart based on wavelet threshold denoising and discusses the selection principles of wavelet threshold, wavelet threshold function, mother wavelet and the number of wavelet decomposition layers. We built an experimental platform and compare the measurement results with Fourier transform algorithm and the commercial polarization mode dispersion measurement instrument. Experimental results show that the proposed wavelet threshold denoising method can effectively reduce impact of noise on the measurement results effectively, which is suitable for different types and lengths of test fiber samples. Taking the commercial instrument as the standard reference, the maximum error of the measurement result of this scheme is 2.27%, which improves the accuracy significantly of the polarization mode dispersion measurement results measure by the fixed analyzer.
In this work, we propose a novel approach to generate high-quality optical millimeter-wave signals using frequency 12-tupling without an optical filter. The proposed approach is comprised of one dual parallel Mach- Zehnder modulators. The two sub-MZMs, biased at the maximum optical transmission point, which is only used for even-order optical harmonic generation, and introduces a phase shift on the optical output signal between the sub- MZMs. By properly adjusting the MZM biasing point, RF LO voltages and phases shift, sixth order optical sidebands only are generated which can result in 12-tupled mm-wave at the photo detector. Optical sideband suppression ratio (OSSR) higher than 37.65 dB and radio frequency spurious sideband suppression ratio (RFSSR) not less than 32.08 dB are achieved in this scheme. The performance of the signal in terms of OSSR and RFSSR is discussed, and the effects of non-ideal factors on OSSR and RFSSR are analyzed.
We propose and analyze a photonic method of generating frequency-quadrupling millimeter-wave signal. This scheme is realized by using a single LiNbO3 intensity modulator (IM) and a Faraday mirror based transverse-electrical and transverse-magnetic mode converter in a Sagnac loop without using an optical filter or an electrical microwave phase shifter. Making use of the intrinsic polarization dependence and the velocity phenomenon of the IM, a special double sideband modulation is implemented, which ensures that the optical carrier can be effectively cancelled employing polarization manipulation. A linear polarizer is used as the polarization selection element to choose the second-order sidebands from the modulated light. After beating at the photodiode, a frequency-quadrupled millimeter-wave signal with >30 dB radio frequency spurious suppression ratio is generated. The imperfection of the devices is considered when estimating the system performance.
We propose a design of a multi-OAM-modes ring-core fiber with two guided modes regions which possesses relatively large effective index separations required for the vector modes. This fiber can support 28 information states bearing OAM spanning 8 OAM orders with large effective mode area by using polarization multiplexing and both signs of topological charge in the ring region, combined with two degenerate fundamental polarization modes in the core region which can hold the whole C bands. There is a high isolation between the modes in these two regions. These designed features have potential applications in the next generation fiber communication systems either in the quantum domain or in the classical domain.
A modified phase recovery algorithm with overlap controlled adaptively used for squared 16-QAM is proposed, which is
based on the 4th-power algorithm and relieve the problem of block-size-choosing. By using this modified algorithm,
1.8MHz linewidth tolerance for 25G Baud 16-QAM is improved on traditional 4th-power algorithm.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.