Research on 32-tupling frequency terahertz wave generation based on Mach-Zehnder modulators cascaded

Chen, Xinqiao; Liu, Xiaorui; Ba, Wenyao; Dai, Siyuan

doi:10.1016/j.ijleo.2022.170027

Cited by 8 publications

(4 citation statements)

References 26 publications

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“…Suppressing the carrier in the generation of optical millimeter waves is a key issue. In [43] , an adjustable 1 × 2 optical splitter and 180 °phase shifter are adopted to suppress the carrier wave in the system. The splitting ratio of the splitter is set to 0.88:0.12 based on the theoretical analysis.…”

Section: Discussionmentioning

confidence: 99%

Filterless frequency 32-tupling millimeter-wave generation based on two cascaded dual-parallel Mach–Zehnder modulators

et al. 2023

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This study proposed a novel scheme for filterless frequency 32-tupling millimeter wave (MMW) generation based on two cascaded dual-parallel Mach–Zehnder modulators (DPMZMs). When the MZMs are biased on a maximum transmission point and the phase difference of the radio frequency (RF) driving voltage between the two MZMs in DPMZM is π/2, the DPMZM can be used as a quadrupler, which can generate ±4n-order optical sidebands. When the phase difference of the RF driving voltage between the two DPMZMs is π/4, the two cascaded DPMZMs can be used as an octupler, which can generate ±8n-order optical sidebands. After the ±8th-order optical sidebands are suppressed by adjusting the modulation index of MZMs, the center carrier is suppressed by a polarization multiplexing structure, and the ±8n (n > 2) sidebands are ignored because their amplitudes are very small. The main optical components remaining in the output of the two cascaded DPMZMs are ±16th-order optical sidebands, which are beaten in the photodetector to obtain frequency 32-tupling MMW. The theoretical and experimental optical sideband suppression ratios (OSSRs) and radio frequency spurious suppression ratios (RFSSRs) are 53.7 dB and 53.53 dB and 47.7 dB and 47.33 dB, respectively. The experimental and theoretical analysis is consistent, which verifies the feasibility of the scheme. The influence on the OSSR and RFSSR of the generated signals by the extinction ratio and DC bias drift of the MZMs, the initial phases and the amplitudes of the RF drive signal, and the azimuth of the polarization controller (PC) are investigated.

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Section: Discussionmentioning

confidence: 99%

Filterless frequency 32-tupling millimeter-wave generation based on two cascaded dual-parallel Mach–Zehnder modulators

et al. 2023

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“…There are two main ways for external modulation technology to generate optically-borne MMW Cascaded modulator modulation to generate MMW signals, The parallel modulator modulates to generate a MMW signal. Literature [12,13] describes a method for generating 32-tupling terahertz waves and obtaining output signals consisting mainly of ±16th order sidebands, with the extinction ratios of the MZMs all set above 60 dB. Some schemes use semiconductor optical amplifiers (SOA) devices and optical filters to realize four-wave mixing to generate MMW signals, which have large spontaneous noise and low efficiency.…”

Section: Introductionmentioning

confidence: 99%

Photon Generation Scheme of 32‐Fold Millimeter‐Wave Signal Based on Mach‐Zehnder Modulator

Wang,

Ren

et al. 2024

Annalen der Physik

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This paper proposes a 32‐tupling frequency millimeter‐wave (MMW) filter‐free system based on four Mach‐Zehnder Modulators (MZM) connected in parallel and cascaded with a simple radio‐fiber (RoF) link structure. The four MZMs are all at the maximum transmission point (MATP), and the radio frequency (RF) driving voltage phase difference between MZMs is π /2. The center carrier is suppressed by using an optical attenuator (OATT) and an optical phase shifter (OPS). Two parallel MZMs can generate ±8th order and ±12th order optical sidebands, and the ±4th order optical sidebands can be suppressed by adjusting the modulation index m of the MZM, using cascaded two dual‐parallel MZMS(DPMZM) and the phase difference of the RF signal source is π/4 to generate ±16th order optical sidebands. The theoretical analysis and simulation experiments are performed for the scheme proposed in this paper. The results show that the simulated and theoretical values of the optical sideband suppression ratio (OSSR) for ±16th order optical sideband signals are 60.02 and 59.96 dB, respectively, and the simulated and theoretical values of the RF sideband suppression ratio (RFSSR) for the 32‐tupling MMW signal are 56.34 and 53.94 dB, respectively.

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“…Increasing the frequency of the MMW generated in the optical domain is a hot topic in current research. The main method used to increase the frequency of MMW is based on an external modulator with the aim to increase the FMF; this method has become a hot topic of research [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…In previous studies [16], a Mach-Zehnder interferometer with a pair of arms connected to the MZM in series was proposed, and a 24-tupling frequency MMW was achieved by setting the modulation index to 14.37. In previous studies [5], a 32-tupling frequency MMW was proposed based on a structure composed of two DPMZMs in series by setting the modulation index to 8.654, and the RFSSR was 47.39. In previous studies [6], a 32-tupling frequency MMW generation scheme was proposed using a structure with two DPMZMs in series, and by setting the modulation index to 8.654, the RFSSR was 26 dB.…”

Section: Introductionmentioning

confidence: 99%

Thirty‐two‐tupling frequency millimeter‐wave generation based on eight Mach–Zehnder modulators connected in parallel

Chen

Dai

et al. 2023

ETRI Journal

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A new method is proposed to generate a 32‐tupling frequency millimeter wave (MMW) with eight Mach–Zehnder modulators (MZMs) connected in parallel. Theoretical analyses and simulation experiments are conducted. The optical sideband suppression ratio (OSSR) of the obtained ±16th order optical sidebands are 61.54 dB and 61.42 dB, and the radio frequency spurious suppression ratios (RFSSRs) of the generated 32‐tupling frequency MMW are 55.52 dB and 55.27 dB based on the theoretical analysis and simulation experiments, respectively; these outcomes verified the feasibility of the new method. The main parameters used to affect the stability of the generated signal are the modulation index and extinction ratio of MZM. Their effects on the OSSR and RFSSR of the generated signals are investigated when they deviate from their designed values. Compared with the other proposed methods for the generation of 32‐tupling frequency MMW by MZM, our method has the best spectral purity and stability, and it is expected to have important MMW over fiber applications.

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Research on 32-tupling frequency terahertz wave generation based on Mach-Zehnder modulators cascaded

Cited by 8 publications

References 26 publications

Filterless frequency 32-tupling millimeter-wave generation based on two cascaded dual-parallel Mach–Zehnder modulators

Filterless frequency 32-tupling millimeter-wave generation based on two cascaded dual-parallel Mach–Zehnder modulators

Photon Generation Scheme of 32‐Fold Millimeter‐Wave Signal Based on Mach‐Zehnder Modulator

Thirty‐two‐tupling frequency millimeter‐wave generation based on eight Mach–Zehnder modulators connected in parallel

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