Brillouin Selective Sideband Amplification Research Articles

3-mm Recognition Capability of Forward Stimulated Brillouin Scattering Measurement by Brillouin Selective Sideband Amplification

3-mm Recognition Capability of Forward Stimulated Brillouin Scattering Measurement by Brillouin Selective Sideband Amplification

All-optical microwave oscillator using cross-gain modulation of semiconductor optical amplifier and cascaded stimulated Brillouin scattering effects in optical fiber

In this paper, an all-optical microwave oscillator is proposed and experimentally demonstrated. Via cascaded stimulated Brillouin scattering effects, the second-order Stokes wave can be obtained. A microwave envelope can be generated by beating the continuous wave and the second-order Stokes wave. The functions of microwave envelope detection and feedback modulation are implemented by using cross-gain modulation of a semiconductor optical amplifier, further, the Vernier effect is used to improve the microwave signal. The second Brillouin-selective sideband amplification is employed to enhance oscillation frequency. In this reported scheme, the electrical microwave devices such as high-Q electrical bandpass filter and electro-optic modulator are not required in the microwave oscillation feedback loop. This all-optical microwave oscillator can shake off the electronic block. Meanwhile, the frequency of the generated microwave signal is twice the Stokes frequency shift of the stimulated Brillouin scattering. Furthermore, it can also result in phase noise reduction that only one laser source is used here. Finally, coupled cavities are used to suppress the harmonic presentation. The experimental results show that the all-optical microwave oscillator can generate a single-mode-microwave-oscillation signal with a frequency of 21.66 GHz. The phase noise value at 10 kHz frequency offset is −90 dBc/Hz.

Active ring resonance cavity assisted single-mode all-optical microwave oscillator

Abstract A pure optical microwave oscillator with single mode oscillation is proposed and demonstrated. This system has no any electrical microwave devices as well as electro-optic (E/O) and opto-electronic (O/E) conversion. The oscillation frequency is chosen by Brillouin-selective sideband amplification, and the optical envelope detection and feedback modulation are implemented by a semiconductor optical amplifier (SOA). As a high-Q tunable optical comb filter, an active ring resonance cavity (ARRC) is employed to select one oscillation mode within the Brillouin gain region, and consequently a single mode oscillation signal can be generated. In the experiment, a single mode photonic microwave signal with frequency of 10.83 GHz and side-mode suppression ratio of 48 dB is obtained. The measured phase noise is −88 dBc/Hz@10 kHz. In addition, the tunability is also demonstrated by adjusting the wavelength of the light source.

All-optical microwave oscillator based on semiconductor optical amplifier and stimulated Brillouin scattering.

An all-optical microwave oscillator is proposed and experimentally demonstrated. Based on a pure photonic feedback loop, this system can generate a photonic microwave signal without optical-electrical-optical conversion or any electrical microwave devices. A semiconductor optical amplifier implements the functions of microwave envelope detection and feedback modulation. Meanwhile, Brillouin-selective sideband amplification is employed to lock oscillation frequency. In experiment, a good quality microwave signal with a frequency of 10.8GHz is obtained. The tunability is also demonstrated by adjusting the Brillouin pump wavelength.

Widely Tunable Single Bandpass Microwave Photonic Filter Based on Phase Modulation and Stimulated Brillouin Scattering

We propose and demonstrate a widely tunable single bandpass microwave photonic filter (MPF) based on phase modulation (PM) and stimulated Brillouin scattering (SBS). The operation principle of the filter is based on the concept of using the Brillouin selective sideband amplification to achieve effective PM to amplitude modulation (AM) conversion. Only when one of the phase modulated sidebands lies in the SBS gain spectrum, can PM-to-AM conversion occur and the corresponding PM frequency be detected. Whereas the phase modulated sidebands lie out of the SBS gain spectrum, there is no RF signal obtained due to the -phase difference. As a result, a bandpass filter centered at a special frequency can be achieved. By adjustment of the Brillouin pump wavelength, tunable single bandpass MPF can be obtained. In the experiment, a microwave photonic filter with narrow bandwidth of about 35 MHz and a tuning range of 20 GHz has been obtained.

Harmonic Millimeter Wave Generation and Frequency Up-Conversion Using Optical Injection Locking and Brillouin Selective Sideband Amplification

Harmonic millimeter wave (mm-wave) generation and frequency up-conversion are experimentally demonstrated using optical injection locking and Brillouin selective sideband amplification (BSSA) induced by stimulated Brillouin scattering in a 10-km single-mode fiber. By using this method, we successfully generate third-harmonic mm-wave at 27 GHz (fLO = 9 GHz) with single sideband (SSB) modulation and up-convert the 2 GHz intermediate frequency signal into the mm-wave band with single mode modulation of the SSB modes. In addition, the mm-wave carrier obtains more than 23 dB power gain due to the BSSA. The transmission experiments show that the generated mm-wave and up-converted signals indicate strong immunity against the chromatic dispersion of the fibers.

Millimeter‐wave signal generation utilizing optical‐phase modulation and Brillouin spectral lines suppression

AbstractA novel photonic technique to generate millimeter‐wave signal is presented. By utilizing an optical phase modulator driven by a 10 GHz electrical signal, high‐order modulation sidebands are generated on an optical carrier. In addition, a multiwavelength Brillouin fiber laser (BFL) configuration, acted as multitap notch filter, is used to eliminate unwanted modulation sidebands and keep desired harmonic components. Unlike conventional Brillouin selective sideband amplification or other filtering technology, this technique require neither more external light sources to provide Stokes waves nor wavelength matching between light source and filters. The output of the system is dominated by two high‐order sidebands in the optical domain, separated by desired harmonic of the modulation frequency. Signal multiplication is simulated and experimentally demonstrated. The operation range is only limited by the amount of phase shift achieved in the phase modulator. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1683–1685, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24408

Phase-to-amplitude modulation conversion using Brillouin selective sideband amplification

We demonstrate an effective method for converting a phase modulated signal to an amplitude modulated signal by employing the powerful Brillouin selective sideband amplification technique. We further demonstrate several applications of this technique in various photonic systems, including microwave frequency multiplication, photonic microwave signal mixing with gain, microwave harmonic signal up-conversion, and coherent heterodyne signal detection.

Brillouin selective sideband amplification of microwave photonic signals

We introduce a powerful Brillouin selective side-band amplification technique and demonstrate an important application for achieving gain in photonic signal up- and down-conversions in microwave photonic systems, We show that systems employing such a scheme is also automatically immune to the fiber dispersion effect.

High-quality microwave signal generation by use of Brillouin scattering in optical fibers

An all-optical optoelectronic oscillator is demonstrated in which a novel Brillouin-selective sideband amplification technique is used to provide sufficient gain for the oscillator to start and sustain electro-optic oscillation. Such an oscillator can generate high-frequency, high-spectral-purity, tunable microwave signals in both optical and electrical domains beyond 100GHz.