External fibre laser based pulse amplitude equalisationscheme forrational harmonic modelocking in a ring-type fibre laser

Jeon, Min Yong; Lee, Hak Kyu; Ahn, Jaewook; Lim, Dong Sung; Kim, Ho Young; Kim, Kyong Hon; Lee, El-Hang

doi:10.1049/el:19980139

Cited by 36 publications

(7 citation statements)

References 8 publications

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“…Driven at ¹ 5 GHz with diOE erent amounts of frequency detuning, pulse trains at ¹ 5, 10, 15 and 20 GHz were generated, corresponding to nˆ1, 2, 3, 4, which is similar to results published by others [1,3]. Pulses at 15 and 20 GHz.…”

Section: Experimental Set-upsupporting

confidence: 76%

“…In practical mode locked ® ber lasers working at multi GHz repetition rate, ¢f ranges from a few hundred kHz to a few MHz, p from a few hundred to tens of thousands, while n is from 1 to no more than 20 [1,2].…”

mentioning

confidence: 99%

“…Rationally mode-locking of erbium-doped ® ber lasers at high repetition rates, up to 200 GHz, have been previously reported [1]. Values of n as high as 15 have been used to generate pulse trains with a repetition rate many times that of driving RF source [2].…”

mentioning

confidence: 99%

See 2 more Smart Citations

A Stabilized, Rationally Mode-Locked 10GHz Erbium Fiber Laser

Shan¹,

Edirisinghe²,

Siddiqui³

2001

Fiber and Integrated Optics

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Section: Experimental Set-upsupporting

confidence: 76%

mentioning

confidence: 99%

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A Stabilized, Rationally Mode-Locked 10GHz Erbium Fiber Laser

Shan¹,

Edirisinghe²,

Siddiqui³

2001

Fiber and Integrated Optics

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“…However, the amplitudes of pulse train at two wavelengths are usually not equal for p > 2 (2nd rational harmonic mode-locking). Several methods have been proposed to equalize the output pulse amplitudes, such as nonlinear optics methods and modulator transmittance adjustment methods [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Amplitude-equalized dual-wavelength rational harmonic mode-locked fiber ring laser

Chen

Dutta

2010

Optics Communications

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“…However, the microwaves based on RHML technique suffer from low-frequency microwave noises caused by the inherent low-order harmonics. Several methods, such as nonlinear optical loop mirror [12] and nonlinear polarization rotation [13], have been proposed to realize pulse-amplitude equalization, but the lower order harmonics suppression is still limited. In this article, we propose a simple novel method for high-purity microwave signal generation based on a low-order harmonic-suppressed RHML fiber laser incorporating an external cavity Mach-Zehnder interferometer (MZI) filter.…”

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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External fibre laser based pulse amplitude equalisationscheme forrational harmonic modelocking in a ring-type fibre laser

Cited by 36 publications

References 8 publications

A Stabilized, Rationally Mode-Locked 10GHz Erbium Fiber Laser

A Stabilized, Rationally Mode-Locked 10GHz Erbium Fiber Laser

Amplitude-equalized dual-wavelength rational harmonic mode-locked fiber ring laser

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

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