A microwave photonic phase-shifter based on wavelength conversion in a DFB laser

Abstract

spectrum of the generated CS signal, the optical spectrum presents two phase-locked carriers, which are 26.75 GHz apart. Curves B and C are the spectrums of the two demultiplexed phase-locked carriers and curve D is the spectrum of the phase shifted CS signal.The phase shifting performance of the proposed photonic RF phase shifter was measured by rotating the WP in a HQQ type PC. As shown in Figure 3, a rotation angle of PC that ranges from À50 to þ50 can induce a near-linear phase shifting exceeding 360 and a phase shifting higher than 180 is expected if the rotation angle of PC is increased further. Figure 4 illustrates that the linear RF phase shifter induces a 9.3 ps and 18.7 ps delay (i.e., a 90 and 180 phase shifting) compared with the input RF signal when the rotation angle of PC is set at 22.5 and 45 , respectively. CONCLUSIONSIn this article, a RF photonic phase shifter based on PC is realized and the theoretical fundamentals of this scheme are analyzed. ABSTRACT: We report a miniaturized phase shifter operating in the frequency range from 5 to 7 GHz for noise-parameter extraction. Such a tunable solid-state unit represents a significant reduction in the size and 2600MICROWAVE AND OPTICAL TECHNOLOGY LETTERS / Vol. 52, No. 11, November 2010 DOI 10.1002/mop mass as a source-pull component, compared to its mechanical counterparts. It provides adequate impedance coverage, ultra-fast response, as well as high repeatability, across the designed region. A packaged low-noise amplifier was measured at integer frequencies by use of the phase shifter on the NIST NFRad system. The measured results exhibited good accuracy. The combined uncertainties (Type-A and Type-B) are below 6% for both the minimum noise temperature and the magnitude of the optimum input reflection coefficient.

Colloidal Quantum Dots-PMMA Waveguides as Integrable Microwave Photonic Phase Shifters

“…In [4], for instance, a phase shifter based on wavelength conversion in a distributed feedback laser is demonstrated, and in [5] the phase tuning was achieved by changing the optical carrier wavelength by means of stimulated Brillouin scattering (SBS) in optical fiber. For narrowband phase shift, silicon-on-insulator (SOI) ring resonators have been used as widely tunable RF phase shifters [6].…”

Simultaneous photonic generation of two microwave signals with precisely-controllable phase difference using orthogonal polarization modes

“…Photonic microwave or millimeter-wave generation based on optical beat notes has been studied extensively [1,2,3,4] with the development of ultra-high speed photodetectors in recent years [5,6]. These photonic generation schemes are attractive because they enable high-frequency selectivity over the entire RF region as well as high-speed phase control via electro-optic phase modulators such as traveling-wave type lithium niobate (LN) phase modulators, which are widely used in optical communication systems [7,8].…”

Widely tunable microwave phase shifter based on silicon-on-insulator dual-microring resonator

“…Microwave phase shifters are key components in many microwave applications, such as phased-array antennas [2] and microwave filters [3]. So far, several schemes for phase shifting have been reported [4][5][6][7][8][9][10][11]. For instance, a phase shift of 110° with 6dB RF power variation was obtained by using a distributed-feedback (DFB) laser through wavelength conversion [4], Based on stimulated Brillouin scattering (SBS) in an optical fiber, a phase shift of 360° was achieved with less than 3dB RF power variation [5].…”

“…So far, several schemes for phase shifting have been reported [4][5][6][7][8][9][10][11]. For instance, a phase shift of 110° with 6dB RF power variation was obtained by using a distributed-feedback (DFB) laser through wavelength conversion [4], Based on stimulated Brillouin scattering (SBS) in an optical fiber, a phase shift of 360° was achieved with less than 3dB RF power variation [5]. Two semiconductor optical amplifiers (SOAs) were cascaded to realize a phase shifting range of 0~240° with controllable RF power response based on slow-light effects [6,7].…”