All-optical image-reject frequency down-conversion based on cascaded electro-optical modulators

Tu, Zhaoyang; Wen, Aijun; Zhang, Wu; Xiu, Zhongguo; Yu, Guopeng

doi:10.1016/j.optcom.2018.08.042

Cited by 19 publications

(1 citation statement)

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“…For example, simulation results show the IRR of a phase cancellation based IRM [14] is below 20 dB when there is ±12°phase deviation in a 90°hybrid coupler. Techniques have been proposed based on using a microwave photonic phase shifter [16], [17] and a 90°optical hybrid [18]- [20] to realise broadband 90°phase shift with only small phase deviation for image rejection mixing operation. However, they suffer from the stability problem due to modulator bias drift or path length variation caused by environmental perturbations.…”

Section: Introductionmentioning

confidence: 99%

Brillouin-Assisted Notch Filtering Based All-Optical Image Rejection Mixer

2019

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A novel approach for realizing a microwave photonic image rejection mixer is presented in this paper. It is based on using a widely tunable narrow-band optical notch filter implemented by stimulated Brillouin scattering (SBS) to remove the image signal. The image rejection mixer has a simple structure as it only requires a single integrated dual-polarization modulator for both frequency conversion and pump wave generation for the SBS process. The absence of electrical components enables the image rejection mixer to be operated over a wide frequency range with a high image rejection ratio. A technique is also proposed to suppress the noise generated by the SBS process in the image rejection mixer. Experimental results demonstrate a high and constant image rejection ratio of over 32 dB for the image rejection mixer operating over an RF signal frequency range of 11.8-19.6 GHz, and around −5 dB conversion efficiency.

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