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Broadband microwave photonic channelizer with high optical spectrum efficiency based on odd- and even-order local optical frequency combs.
- Source :
-
Optik - International Journal for Light & Electron Optics . Oct2023, Vol. 288, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
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Abstract
- Microwave photonic channelizers assisted by coherent dual optical frequency combs (OFCs) have been widely considered for wideband radio frequency (RF) spectrum analysis. However, it requires dual OFCs with a large free spectral range (FSR) and multiple comb lines to support a wide RF coverage, leading to a complicated system structure and low optical spectrum efficiency. To this end, we propose a simplified, high optical spectrum-efficiency microwave photonic channelizer, wherein the odd-order and even-order OFCs with a double frequency spacing are generated and isolated to directly slice two frequency-shifted modulated optical spectra into a series of subbands. N comb lines can support 4 × N channels but take up a significantly reduced optical spectrum range. Partial experiments and simulations are presented to demonstrate the scheme. By exploiting a four-lines odd-order OFC and three-lines even OFC, a wideband RF spectrum range of 0–56 GHz is divided into 28 channels with a channel bandwidth of 2 GHz, and various wideband signals are spectrally analyzed with a high measurement accuracy and large image rejection suppression higher than 30 dB. Moreover, a 16-quadrature amplitude modulation (16QAM) vector signal with a center frequency of 7 GHz and a bit rate of 1 Gbps is channelized and successfully recovered with a good constellation diagram. • Propose a simplified, high optical spectrum-efficiency microwave photonic channelizer. • N comb lines can support 4 × N channels. • 0–56 GHz RF range is divided into 28 sub-channels with a channel bandwidth of 2 GHz. • The filtering accuracy requirement of the optical channelized filter is reduced by half. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00304026
- Volume :
- 288
- Database :
- Academic Search Index
- Journal :
- Optik - International Journal for Light & Electron Optics
- Publication Type :
- Academic Journal
- Accession number :
- 169967888
- Full Text :
- https://doi.org/10.1016/j.ijleo.2023.171197