We report a passively Er3+-doped mode-locked fiber laser based on repetition rate multiplication, in which a three-stage Mach Zehnder interference structure is employed as a repetition rate multiplier. The initial soliton pulses are generated from a ring cavity with a fundamental repetition rate of 102.70 MHz, which is a seed laser. When the intrinsic frequency of repetition rate multiplier is almost aligned with a variable optical delay line, the initial repetition rate output from a seed laser, is lifted from 100.20 MHz to 801.03 MHz. This result demonstrates a method to achieve high repetition rate (> 500 MHz) pulse lasers, which avoids the limitation of cavity length on the repetition rate.
A novel photonic-assisted time-interleaved sampling analog-to-digital converter (ADC) utilizing photonic radio frequency memory (PRFM) is proposed. The analog modulated optical signal can be duplicated by PRFM and digitized by a slower electronic ADC, thus increasing of equivalent sampling rate to hundreds of times. A microwave photonic link simulation model investigating the performance of sampling an RF signal with a 55ns duration and 500MHz bandwidth was conducted with 4.9 effective number of bits (ENOB). The equivalent sampling rate reached more than 3.6 GSample/s, an increase of over 360 times of the original 10 MSample/s rate.
In this paper, a broadband microwave photonic channelized receiver based on optical frequency comb (OFC) injection locking technology is illustrated. The simulation results show that, with more than 80 comb lines generated from OFC, this receiver enables channelized scanning and reception of broadband signal up to 40 GHz with instantaneous bandwidth of 1 GHz. Meanwhile, the channels selected using optical injection locking (OIL) technology, perform high gain and low phase noise with suppression ratio between the selected comb line and other comb lines is 28.7 dB. Due to OIL technology, the wideband tunability of this receiver would not depend on the optical filter or demultiplexer, and the band limitation and operation resolution introduced by optical components are broken through. The OIL technology also lead to the architecture of receiver more compact and feasible in practical.
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