High time–bandwidth product and high repetition rate period signal generation based on spectral hole burning crystal

Abstract

This paper proposes an approach for the generation of high time-bandwidth product (TBP) and high repetition rate pulse compression period signal. The complex spectral grating is created through a reference pulse and multiple programming pulses with different start frequencies. As the multiple probe chirped pulses with different start frequencies interact with the complex spectral gratings, a high TBP and repetition rate period signal is thus generated. This technique has the potential to generate a time-bandwidth product of 10⁵ when the repetition rate reaches up to tens of GHz. At the end of this paper, two simulation results of pulse compression period signal with 4×10⁵ TBP and 20 GHz repetition rate are presented.

Improving the intensity and efficiency of compressed echo in rare-earth-ion-doped crystal

“…As mentioned in Refs. [2], [3], and [6]- [8], the chirp rate of the probe laser is much higher than that of the engraving lasers (Eq. ( 2) of Ref.…”

“…This technique can generate ∼ GHz/s bit rate codes with fantastic ∼10 5 TBP, such as an ASC-II code, [5] a periodic Barker code, [6,7] and a pulseposition-modulation code. [8] Several successful cases of AWG based on the 3PE technology have been demonstrated. Meanwhile research for the improvements of 3PE's intensity and efficiency is continuing.…”

“…According to the novel model of compressed echo, reducing the time delay of the chirp lasers and the scanning lasers around the center frequency of the inhomogeneously broadened spectrum while utilizing the crystal with larger coherence time and excitation lifetime can improve the intensity and efficiency of the compressed echo, which makes the 3PE technology more suitable for AWG. [5][6][7][8] Finally, the theoretical analysis is validated by numerical simulations.…”

Microwave Photonic Pulse Generation With High Transfer Rate and Precision Pulse Width by Partly Temporally-Overlapped Photon Echo Excitation

“…Compared with the frequency shift scheme in Ref. [9] and [13], the proposed photon echo scheme can achieve a variable echo pulse width 𝜏 $ by adjusting the bandwidth of the corresponding segment of the control pulse. And to generate a compressed photon echo, the chirp rate of the pulse sequence must conform to the relationship 𝛼 % = 𝛼 !…”

“…At present, an arbitrary signal generation scheme based on photon echoes can generate several X. Wang, S. Zhang (Corresponding author), J. Liu, and S. Wang are with the Tianjin Key Laboratory of Film Electronic and Communication Device, School of Integrated Circuit Science and Engineering, Tianjin University of Technology, Tianjin, 300384, China (e-mail: wangxr12138@gmail.com; narrow photon echo pulses with controllable amplitudes and intervals by incident multiple probe or control pulses to compose the target signal [9]- [12]. With the large inhomogeneous broadening absorption line of tens of GHz provided by Tm3+:YAG crystals, the time-bandwidth product can reach 10 5 [13], however, it employs a frequency shift to generate a photon echo train, which reduces the subpulse-width accuracy. Herein, we proposed the optical synthesis of microwave signals via photon echo pulse train with the variable amplitude and adjustable time delay generated by partly temporally-overlapped excitation and segmented control pulses, which can offer high precision subpulse width of photon echo signals while maintaining a high data transfer rate and provides a more flexible bandwidth consumption.…”