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Photonics
Special Issues
Time and Frequency Transfer over Fiber Link
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Time and Frequency Transfer over Fiber Link

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optical Communication and Network".

Deadline for manuscript submissions: closed (15 February 2024) | Viewed by 5236

Special Issue Editor

Prof. Dr. Jianye Zhao

E-Mail Website
Guest Editor
Department of Electronics, Peking University, Beijing 100080, China
Interests: quantum frequency standard; optical frequency comb; optical frequency transmission; photoelectric neural computing

Special Issue Information

Dear Colleagues,

Recent developments in the field of time-frequency transfer have led to renewed interest in many areas, including fundamental physics measurements, precision navigation, coherent radar array, and 5G. The requirements of these applications include increased stability and reduced cost, power consumption, complexity, and anti-interference. Therefore, there is a growing trend in developing time and frequency over fiber transmission systems to meet the abovementioned requirements.

Three main methods of time and frequency dissemination over fiber link have been proposed, including optical frequency dissemination, microwave frequency dissemination, optical frequency comb dissemination, and the development of low-noise laser source and high-precision discrimination technology to meet requirements for longer-haul and higher-precision distribution over fiber link. To further advance the field of time-frequency transfer, we encourage you to submit your work to this Special Issue.

For this Special Issue, you are invited to submit research papers on advances in time-frequency transfer over fiber link. Specific areas of interest in the topic include (but are not limited to) the following:

(a) Low noise coherent laser source, including mode-locked lasers;

(b) High-precision phase discrimination technologies;

(c) High-stability optical frequency transmission systems;

(d) Relay technologies for long-haul transmission;

(e) Application opportunities for RF over fiber systems, such as phase array feed (PAF), photonics-based coherent radar, or 5G.

Prof. Dr. Jianye Zhao
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • radio frequency photonics
  • optical frequency comb
  • radio-over-fiber systems
  • time and frequency dimension
  • laser
  • ultrafast lasers

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (3 papers)

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Research

12 pages, 2110 KiB  
Article
Theoretical Demonstration of Improved Performance in Multi-Channel Photonic RF Signals Based on Optical Injection Locking of Optical Comb and Array Lasers
by Anh-Hang Nguyen, Hyo-Sang Jeong, Hyungsik Shin and Hyuk-Kee Sung
Photonics 2024, 11(2), 143; https://doi.org/10.3390/photonics11020143 - 4 Feb 2024
Viewed by 1467
Abstract
Multi-channel radio frequency (RF) signal generation, facilitated by photonic technology, offers significant potential for generating coherent signals with a high frequency and low phase noise, providing multifunctional capabilities across diverse platforms, including RF and photonic systems. Traditional methods for multi-channel photonic RF signal [...] Read more.
Multi-channel radio frequency (RF) signal generation, facilitated by photonic technology, offers significant potential for generating coherent signals with a high frequency and low phase noise, providing multifunctional capabilities across diverse platforms, including RF and photonic systems. Traditional methods for multi-channel photonic RF signal generation typically entail the integration of diverse optical components, such as filters and amplifiers. However, this integration often results in compromises related to power efficiency, cost-effectiveness, and implementation simplicity. To address these challenges, we propose a novel method for generating multi-channel photonic RF signals based on optical injection locking technology. This approach eliminates the necessity for traditional optical components, leading to a substantial enhancement in the performance of photonic RF signals. We present the design of an optical injection locking-based multi-channel photonic RF signal generation schematic and theoretically evaluate its Signal-to-Noise Ratio (SNR) and eye pattern performance for data modulation using the Lumerical INTERCONNECT simulator. Our results reveal a significant 1.3-dB and 3.6-dB enhancement in SNR for 30-GHz and 60-GHz signals, respectively. Furthermore, we observed an improved communication performance, as evidenced by enhanced eye patterns in 3-Gbps data transmission compared to passive photonic RF signal generation methods. Full article
(This article belongs to the Special Issue Time and Frequency Transfer over Fiber Link)
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18 pages, 6885 KiB  
Article
FSK/ASK Orthogonal Modulation System Based on Novel Noncoherent Detection and Electronic Dispersion Compensation for Short-Reach Optical Communications
by Lei Xin, Xiao Xu, Liuge Du and Jia Zhao
Photonics 2024, 11(1), 44; https://doi.org/10.3390/photonics11010044 - 31 Dec 2023
Viewed by 1887
Abstract
We propose an FSK/ASK orthogonal modulation system based on a novel noncoherent detection (NCD) scheme, aimed at expanding the system capacity for short-reach optical communications cost-effectively. In the transmitter, the FSK optical signal is generated by simple frequency modulation through a directly modulated [...] Read more.
We propose an FSK/ASK orthogonal modulation system based on a novel noncoherent detection (NCD) scheme, aimed at expanding the system capacity for short-reach optical communications cost-effectively. In the transmitter, the FSK optical signal is generated by simple frequency modulation through a directly modulated distributed feedback laser. Subsequently, by utilizing a Mach–Zehnder modulator for ASK modulation, the FSK/ASK optical signal is obtained. The novel and low-complexity NCD receiver consists of an intensity detection branch and a frequency detection branch. The frequency detection branch is composed of an optical differentiator, a photodetector, and frequency extraction circuits. Notably, the proposed NCD scheme overcomes the limitation of the traditional FSK/ASK-NCD receiver stemming from the trade-off between the detected signal quality of the amplitude and frequency. Furthermore, electronic dispersion compensation (EDC) is available. Through numerical simulations, our findings demonstrate that the proposed FSK/ASK-NCD system, assisted by EDC, achieves a remarkable 100 km transmission span for both 40 Gbps 2FSK/2ASK and 60 Gbps 2FSK/4ASK modulation formats, which surpasses the 2ASK-DD and the 4ASK-DD systems, where the maximum achievable spans are limited to less than 20 km. These results underscore the potential of the proposed system as a robust candidate for future passive optical access networks. Full article
(This article belongs to the Special Issue Time and Frequency Transfer over Fiber Link)
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13 pages, 6009 KiB  
Article
Remote Residual Instability Evaluation of Comb-Based Precise Frequency Transmission for Optical Clock
by Zhaolong Li, Sibo Gui, Haitao Wu, Ziyu Guo and Jianye Zhao
Photonics 2023, 10(11), 1188; https://doi.org/10.3390/photonics10111188 - 25 Oct 2023
Cited by 2 | Viewed by 1210
Abstract
Optical clocks can be used as the absolute frequency reference due to their high accuracy and stability. In a precise optical clock transmission system, the instability loss of the link is usually evaluated by beating the remote optical signal with the reference clock, [...] Read more.
Optical clocks can be used as the absolute frequency reference due to their high accuracy and stability. In a precise optical clock transmission system, the instability loss of the link is usually evaluated by beating the remote optical signal with the reference clock, which is not suitable for real frequency distribution applications. Therefore, it is necessary to assess the performance directly at the remote site for the optical frequency transfer, because the two sites of the link are usually not co-located. In this paper, we proposed a comb-based remote residual instability evaluation scheme. Two coherent optical combs with different wavelengths were extracted from a frequency stable comb and transmitted after multiplexing. The residual instability was evaluated directly at the remote site by measuring the phase fluctuation difference between the two combs. We achieved 8.61 × 10−19 at 40,000 s over a 10 km fiber link, reaching the instability of optical clocks. These results revealed that our scheme can evaluate optical clock frequency transmission directly at the remote site, which made the method truly practical. Full article
(This article belongs to the Special Issue Time and Frequency Transfer over Fiber Link)
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