Dual Electro-Optic Comb Generator by Heterodyning Two Combs for Extending the Optical Bandwidth

A novel dual-electro-optic (DEO) comb generator is proposed by heterodyning the optical frequency combs (OFCs) to achieve a high bandwidth of ~2.74 THz with an efficient and cost-effective structure. This can attract the research community's interest, particularly for the inherent support in op...

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Bibliographic Details
Published in:IEEE photonics technology letters 2023-11, Vol.35 (21), p.1-1
Main Authors: Ullah, Rahat, Ullah, Ubaid, Ullah, Sibghat, Al-Atawi, Abdullah A., Alwageed, Hathal S., Almadhor, Ahmad, Chen, Shuaidong, Ren, Jianxin
Format: Article
Language:English
Subjects:
Bandwidths
C band
cascaded modulators
Continuous radiation
dual electro-optic OFC
Electrooptic modulators
frequency heterodyning-based OFC
Frequency modulation
Generators
Heterodyning
Mach-Zehnder interferometers
Modulation
Modulators
OFDM
Optical communication
Optical frequency
Optical frequency comb (OFC)
Optical mixing
Optical modulation
Optics
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Summary:A novel dual-electro-optic (DEO) comb generator is proposed by heterodyning the optical frequency combs (OFCs) to achieve a high bandwidth of ~2.74 THz with an efficient and cost-effective structure. This can attract the research community's interest, particularly for the inherent support in optical communications due to its simplicity and high throughput. The OFC is generated by cascading a continuous wave (CW) laser and Mach Zehnder modulator (MZM) coupled to a second laser source that produces a broad spectrum of frequencies by the frequency heterodyning after passing it through a second MZM. This is the highest number of comb lines produced so far in cascaded configurations of the electro-optic modulators. The frequency difference between the two lasers is carefully selected, equal to 1.38 THz, which combinedly produces around 137 well-flattened OFC lines with 20 GHz frequency spacing and more than 40 dBm tone to noise ratio and an amplitude difference of 0 to 6 dB. The bandwidth of the generated flattened comb source is approximately 2.74 THz, which covers over half of the optical C-band.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2023.3285155