Optical mm-wave generation by using external modulator based on optical carrier suppression

Development of a New Approach for High-Quality Quadrupling Frequency Optical Millimeter-Wave Signal Generation Without Optical Filter

“…Compared with the conventional electrical method, the optical method is preferable [15][16][17]. By beating the two high-order optical sidebands with good coherence in a square-law photodetector (PD), a laser with an optical external phase or intensity modulator is a promising and attractive technology for the generation of high-frequency mm-wave signals, the frequency of which can be several-folds that of the radio frequency (RF) local oscillator [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. In this technology, a high optical sideband suppression ratio (OSSR) is extremely desirable for the generation of high-quality mm-wave signals.…”

Wireless network based on radio‐over‐fiber with optical carrier reuse by fiber grating

“…It increases the capacity, bandwidth, and convenience for both fixed and mobile users [1,2]. The key techniques of wireless network, such as the optical millimeter-wave generation and digital signal transmission are widely studied [3][4][5][6][7]. What's more, many researches are focusing on simplifying the configuration of base station (BS) to reduce the BS cost as the generation and control of signal is mainly in central station (CS), such as optical carrier reuse for the up-link data transmission [7][8][9][10].…”

Influence of the modulation index of Mach–Zehnder modulator on RoF link with ASK millimeter-wave signal

“…Usually, the Mach-Zehnder modulator (MZM) and electro-absorption modulator (EAM) are used to implement this. However, different prototypes of MZM can generate the optical mm-wave with different spectra, such as double sideband (DSB), optical carrier suppression (OCS), and single sideband (SSB), while each of them has different immunity capacity for the fiber dispersion [3][4][5][6]. The DSB optical mm-wave suffers not only from the fading effect but also from the time shift of the code caused by the sidebands' walk-off [3].…”

“…The DSB optical mm-wave suffers not only from the fading effect but also from the time shift of the code caused by the sidebands' walk-off [3]. Although the OCS optical mm-wave and the SSB optical mm-wave with the signal carried by both the optical carrier and its sideband is immune to fading, time shift of the code limits its transmission [4][5][6]. The SSB optical mm-wave with the signals carried only by optical sideband can overcome both the fading effect and the time shift of the code [7].…”

“…The signals carried by the first sideband (left) and the optical carrier (right) with the radio frequency modulation peak-to-peak voltages of (i)/(I) 0 5. V, (ii)/(II) 1.0 V, (iii)/(III) 2.0 V, (iv)/(IV) 2.75 V, (v)/(V) 3.0 V, (vi)/(VI) 4.0 V.…”