All-optical filter for simultaneous implementation of microwave bandpass and notch responses based on semiconductor optical amplifier

doi:10.1007/s12200-009-0060-6

Front Optoelec Chin

2009, Vol. 2

Issue (4) : 403-406 https://doi.org/10.1007/s12200-009-0060-6

RESEARCH ARTICLE

All-optical filter for simultaneous implementation of microwave bandpass and notch responses based on semiconductor optical amplifier

Enming XU, Xinliang ZHANG(

), Lina ZHOU, Yu ZHANG, Yuan YU, Fei WANG, Dexiu HUANG

Wuhan National Laboratory for Optoelectronics, College of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China

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Abstract

An all-optical filter structure to simultaneously implement microwave bandpass and notch filter is proposed and experimentally demonstrated. The structure is based on a recirculating delay line (RDL) loop consisting of a semiconductor optical amplifier (SOA) followed by a tunable narrowband optical filter and a 10∶90 coupler. The converted signal is generated in a wavelength conversion process based on cross-gain modulation of amplified spontaneous emission in the SOA. The converted signal circulating in RDL loop realizes a negative bandpass response. The negative bandpass filter and a broadband allpass filter are synthesized to achieve a notch filter with flat passband which can excise interference with minimal impact on the wanted signal.

Keywords microwave photonic microwave filters optical signal processing semiconductor optical amplifier cross-gain modulation amplified spontaneous emission

Corresponding Author(s): ZHANG Xinliang,Email:xlzhang@mail.hust.edu.cn

Issue Date: 05 December 2009

Cite this article:

Enming XU,Xinliang ZHANG,Lina ZHOU, et al. All-optical filter for simultaneous implementation of microwave bandpass and notch responses based on semiconductor optical amplifier[J]. Front Optoelec Chin, 2009, 2(4): 403-406.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-009-0060-6
https://academic.hep.com.cn/foe/EN/Y2009/V2/I4/403

Fig.1 Experimental setup for all-optical SOA-based microwave filter(λ:pump wavelength; λconverted wavelength)

Fig.2 Spectrum of ASE of SOA

Fig.3 Theoretical and measured allpass responses for SOA current of zero

Fig.4 Theoretical and measured bandpass responses for SOA current of 157.5 mA and TNOF of 1550.92 nm

Fig.5 Theoretical and measured notch frequency responses corresponding to the bandpass response in Fig. 4

Fig.6 Theoretical and measured frequency responses with a triangular shape

Fig.7 Theoretical and measured notch frequency responses with flat passband corresponding to the response in Fig. 6

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