Abstract
We present a novel approach for triangular-shaped waveform generation by applying optical single sideband (OSSB) modulation and optical carrier suppression (OCS) modulation to an input signal. Firstly, an OSSB modulated signal consists of an optical carrier and +1st-order sideband, is initially generated with a dual-drive Mach-Zehnder modulator (DD-MZM1) driven by a quadruple frequency RF signal. By tuning the amplitude of the RF signal and the bias of the DD-MZM1, the power ratio between the carrier and the +1st-order sideband is controlled as 19 dB. These two components are then transmitted to a DD-MZM2 which is driven by a fundamental frequency. After OCS modulation, four sidebands are existed in optical spectra of the modulated signal. By utilizing a fiber Bragg grating (FBG) to remove the undesired sideband, an output signal that features a triangular-shaped waveform is finally achieved.
Highlights
In recent years, photonic generation of arbitrary waveform signal is an attractive research area in microwave photonic
With the optical carrier suppressed (OCS) modulation provided by the second modulator (DD-MZM2), each component is further split into two new ones as long as modulation index of DD-MZM2 is within a proper range
A lightwave with an angular frequency of ω0 from the continuous wave (CW) laser is coupled into DD-MZM1 to perform the optical single sideband (OSSB) modulation
Summary
Photonic generation of arbitrary waveform signal is an attractive research area in microwave photonic. One typical method is based on optical-spectrum-shaping combined with frequency-to-time mapping (FTTM)[5,6,7]. Above, triangular waveform has been obtained by using frequency comb generation and optical spectrum manipulation[14], and time-domain synthesis[15,16]. Through these approaches, it can be seen that external modulation could effectively reduce the complexity of operation. We propose a novel photonic approach to generate triangular-shaped waveform signals based on two cascaded DD-MZMs. A signal consisting of a carrier and a sideband is firstly generated by the OSSB modulation in DD-MZM1. We have successfully generated a 10 GHz triangular-shaped waveform signal with a 5 GHz RF driving signal
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
