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Effects of the Nonlinearity Caused by the ‘MZM-WDM’ Structure in Time-Wavelength Interleaved Photonic Analog-to-Digital Converters

The effects of the nonlinearity caused by the structure of ‘Mach-Zehnder modulator (MZM) - wavelength division demultiplexer (WDM)’ in Time-Wavelength Interleaved Photonic Analog-to-Digital Converters is studied for the first time. Even if the MZM is biased at quadrature, the narrow passband width of the WDM after modulation may result in the presentation of even harmonics in the spectrum of the sampling results. As the radio frequency (RF) of the signal being sampled increases and the passband width of the WDM decreases, the magnitudes of the even harmonics increase. As a result, the spur-free dynamic range (SFDR) would be determined by the magnitudes of the signal and the 2 nd harmonic instead of the 3 rd harmonic. When the passband width of the WDM is less than 100 GHz, the variation of the SFDR can be as much as 6 dB over 0 ∼ 25 GHz-frequency range of the signal being sampled. Theoretical analysis is verified by the simulation and experimental results. When the passband width of the WDM is greater than 150 GHz, the SFDR over 0 ∼ 25 GHz-RF range is always dominated by the 3 rd harmonic. When the passband width is 50 GHz, the SFDR is dominated by the 2 nd harmonic for RF frequencies above 10 GHz, and can be as much as 20 dB higher than the 3 rd harmonic term at 25 GHz-RF frequency. The requirement for the passband width of the WDM can be specified according to the frequency range of the signal being sampled to avoid the presentation of even harmonics and optimize the design of TWIPADCs.

Ketersediaan

Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.39 No.23 December 1 2021

No. Panggil

-

Penerbit

: .,

Deskripsi Fisik

p. 7447-7454

Bahasa

English

ISBN/ISSN

-

Klasifikasi

NONE

Tipe Isi

-

Tipe Media

-

Tipe Pembawa

-

Edisi

-

Subjek

WDM
NONLINEARITY
SFDR
TWIPASCS
WARMONICS
MZM

Info Detail Spesifik

10.1109/JLT.2021.3115940

Pernyataan Tanggungjawab

Cheng Wang, Yiwei Sun, Guiling Wu, Jianping Chen

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