Microwave signals generated by optical heterodyne between injection-locked semiconductor lasers

Genest, Jérôme; Chamberland, Martin; Tremblay, Pierre; Têtu, M.

doi:10.1109/3.585487

Cited by 55 publications

(28 citation statements)

References 8 publications

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“…In the optical heterodyning scheme, the main obstacle to generate stable microwave signals with narrow linewidth and low phase noise is to maintain sufficient phase coherence between the two lazer beams. Several techniques to solve the coherence issue have been investigated, including optical injection locking [7], phase locking [8], and dual-longitudinal modes [9] or single-longitudinal-mode (SLM) fiber lazers [10], etc. In the fiber-lazer-based schemes, as both of the longitudinal modes oscillate in the same resonator cavity, no additional phase locking technique is required.…”

Section: Photonic Generation Of Microwave Signals By Exploiting Fibermentioning

confidence: 99%

Photonic generation of microwave signals by exploiting fiber birefringence effect in single‐longitudinal‐mode distributed Bragg reflector fiber lazer

Zeng

Liu

Sun

et al. 2010

Micro & Optical Tech Letters

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ratio, even as low as 1.1. This makes the phase shifter ideal in applications involving FET whose capacitance ratio is normally small. However, such an implementation requires that the maximum and minimum capacitances of the varactor of each load are known accurately. Also, because there is no restriction on the type of the switch in a load, it can be a PIN diode, a FET, or a MEMS provided that proper integration with the rest of the phase shifter circuit is observed.By using a varactor diode and a PIN diode for each load, an experimental phase shifter operating at 2.5 GHz was developed. By considering the parasitics of the diodes and peripheral circuits, the need for inductors in the resonant circuits of the phase shifter was eliminated. The measurement confirmed the accuracy of the theoretical design in general. Any disagreements between the measured and predicted values of the insertion and return losses at some bias voltages were believed to be due to the finite resistances of the diodes and lack of accurate manufacturer's specification of the diodes at the desired operating frequency. It was found that the phase shifter has a bandwidth of $7%. The performance of the new phase shifter can be improved significantly using MMIC technology, where losses and parasitics due to the connections, and varactor devices can be controlled and reduced drastically, and where the PIN diodes can be replaced with FET switches easily for higher efficiency. ABSTRACT: A novel all-optical microwave generation technique based on fiber birefringence effect in single-longitudinal-mode (SLM) distributed Bragg reflector (DBR) fiber lazer is presented. Owing to the birefringence-induced mode splitting, the proposed lazer could provide a microwave signal at $1.72 GHz with a 3 dB bandwidth of $30 kHz. Moreover, another microwave signal at 10.96 GHz could also be generated as transverse pressure was applied onto the proposed lazer. Similar phenomenon was observed when another DBR lazer constructed with Er/Yb co-doped fiber was used, and a microwave signal at 11.47 GHz with $33 kHz linewidth have also been achieved.

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Section: Photonic Generation Of Microwave Signals By Exploiting Fibermentioning

confidence: 99%

Photonic generation of microwave signals by exploiting fiber birefringence effect in single‐longitudinal‐mode distributed Bragg reflector fiber lazer

Zeng

Liu

Sun

et al. 2010

Micro & Optical Tech Letters

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“…Another efficient way is based on the optical beating between two independent lasers with optical phase-locked loop [6] or optical injection locking [7] or dual-wavelength fiber lasers [8]. Microwaves can also be generated using modelocked lasers.…”

Section: Introductionmentioning

confidence: 99%

High-purity microwave signal generation using a low-order harmonic-suppressed rational harmonic mode-locked fiber laser incorporating a Mach-Zehnder interferometer

Gao

2010

Microw. Opt. Technol. Lett.

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phase of two paths, the IMD3 can be simultaneously enhanced by more than 10 dB for a frequency range of 510 MHz (1.98-2.49 GHz) without any change in electrical circuitry. As the linearization process that covers broad RF band would be very desirable, we measured the IMD3 for various channel bandwidths from the inset of Figure 3. As encouraging results, the IMD3 enhancements of more than 10 dB in 100 MHz channel spacing are achieved compared to free running operation. These results indicate that the proposed predistortion scheme is available for various frequency bands and their broad channel bandwidths. Figure 4 shows output powers of the fundamental and IM3 signals against input powers fed to LD1. The SFDR under free running is measured to 85.8 dB Hz 2/3 and is increased to 93.0 dB Hz 2/3 with predistortion. We can achieve 7.2 dB dynamic range enhancement.The proposed optoelectrical predistorter can suppress distortions of optical sources such as a DFB-LD as well as a FabryPerot LD with the same epi-structure. Also, this method has effectiveness for external environments even if the distortion characteristics of the LD are functions of external parameters. CONCLUSIONSA laser diode has been used as the key component of radioover-fiber system. Our linear optical transmitter using the novel opto-electrical predistorter is a strong candidate for broadband RoF systems. We obtained the broadly and significantly enhanced IMD3 without any electrical change. These results indicate that the proposed broadband optical transmitter is very suitable for future high-capacity and broadband multimedia wireless services. ABSTRACT: A simple approach to generate high-purity microwave signals based on a rational harmonic mode-locked fiber laser is proposed and demonstrated by incorporating an external cavity MachZehnder interferometer filter to suppress the low-order harmonics. A pulse train of equal amplitude with a repetition rate of about 10 GHz, which is four times of the frequency of the microwave drive signal ($2.5 GHz), is obtained. A high-spectral purity microwave signal at 10 GHz can be achieved by beating the filtered rational harmonics at a photodetector. The signal-to-noise ratio of the generated microwave signal is about 20 dB enhanced compared with the filter-free case.

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“…Several schemes have been proposed to generate stable microwave signals with improved microwave phase noise by optical heterodyning, for instance, using optical injection locking [8,9] or an optical phase lock loop [10,11] for two discrete laser sources, stimulating dual-longitudinal-modes [12], or two singlelongitudinal-mode wavelengths [13], or two polarization modes [14] corresponding to different wavelengths in a single laser source. Among these approaches, narrow bandwidth filtering is crucial in the generation of coherent dual-wavelength lasing.…”

Section: Introductionmentioning

confidence: 99%

Photonic generation of microwave signals using dual-wavelength single-longitudinal-mode fiber lasers

Sun

Huang

et al. 2011

Optik

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Microwave signals generated by optical heterodyne between injection-locked semiconductor lasers

Cited by 55 publications

References 8 publications

Photonic generation of microwave signals by exploiting fiber birefringence effect in single‐longitudinal‐mode distributed Bragg reflector fiber lazer

Photonic generation of microwave signals by exploiting fiber birefringence effect in single‐longitudinal‐mode distributed Bragg reflector fiber lazer

High-purity microwave signal generation using a low-order harmonic-suppressed rational harmonic mode-locked fiber laser incorporating a Mach-Zehnder interferometer

Photonic generation of microwave signals using dual-wavelength single-longitudinal-mode fiber lasers

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