Chirped Microwave Signals Generation Using a Distributed Feedback Laser With Alternating Structure of Active- and Passive-Cavity

Xu, Changda; Jin, Young-Woo; Wang, Jian; Sun, Weimin; Xiong, Liangming; Chen, Yinfang; Chen, Wei; Zhu, Na

doi:10.1109/jphot.2021.3103008

Cited by 2 publications

(2 citation statements)

References 14 publications

(18 reference statements)

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“…As can be seen from Fig. 6, wavelength changes (318 pm, 403 pm ) caused by 10 mA current gradually increase with the increase of injection current, which is because the thermal efficiency of the laser varies with the injection current [18]. The short grating length and large coupling coefficient result in a side-mode suppression ratio (SMSR) of 37 dB at a current of 50 mA.…”

Section: Experiments and Discussionmentioning

confidence: 93%

A DFB Laser With Integrated Passive Region Suitable for PAM-4 Modulation Signal

Jin

et al. 2022

IEEE Photonics J.

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Numerous studies have shown that the use of PAM-4 modulation format for DFB lasers with integrated passive regions (DFB IPE lasers) can greatly improve information transmission capabilities. In this paper, it is found by theoretical analysis that a passive waveguide can reduce the photon concentration and injection current in the cavity under the same output optical power. The DFB IPE laser has large saturated optical power and slope efficiency, which reduces the distortion of the electro-optical conversion of the PAM-4 signal. A DFB IPE laser was fabricated with a total cavity length and passive waveguide length of 130 um and 40 um, respectively. The saturation output power, slope efficiency, and modulation bandwidth of this laser are 23.5 mW (61 mA), 0.41 W/A, 22 GHz, respectively. The relative intensity noise is also below -145 dB/Hz. Besides, we have verified the high temperature working capability of this laser in a 40 Gbps PAM-4 signal back-to-back (BTB) transmission system. When the signal peak-to-peak voltage is 750 mV, a clear eye diagram with an eye height of 196 mV is obtained at 343 K.

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Section: Experiments and Discussionmentioning

confidence: 93%

A DFB Laser With Integrated Passive Region Suitable for PAM-4 Modulation Signal

Jin

et al. 2022

IEEE Photonics J.

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“…9, the spectrum is red-shifted as a whole, and the amount of wavelength drift increases with increasing current, 401, 570, 699, 850 pm, respectively. This is caused by the rise in the temperature of the active layer of the chip [16]. The side mode spacing under different currents is slightly different, but it remains stable overall.…”

Section: Resultsmentioning

confidence: 99%

A Novel Grating Coupling Coefficient Extraction Method for DFB Laser Diodes Based on Side Mode Spacing

Chen

Jin

et al. 2022

IEEE Photonics J.

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A novel method to extract the grating coupling coefficient of distributed feedback (DFB) lasers by comparing the theoretical and experimental values of the side mode spacing is demonstrated. Compared with the traditional method, the proposed method in this paper transforms the solution process of the lasing model with multiple unknown parameters into that with only the side mode spacing and coupling coefficient, which significantly reduces the computational workload. Furthermore, the bias current of the measured spectrum can be much higher than the threshold current, which makes the method less affected by noise. This paper theoretically analyzes the changing relationship between multiple parameters by calculating the lasing mode distribution, and the results show that the side mode spacing is only sensitive to the coupling coefficient. In addition, the grating coupling coefficients (57-61 cm −1 ) of the fabricated DFB laser diodes are experimentally extracted at 40-80 mA currents. The variation of the coupling coefficient with current is less than 2‰/mA, and the method exhibits pretty good stability. Meanwhile, the grating coupling coefficient extraction method for the complex grating types is also considered in this paper.

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Chirped Microwave Signals Generation Using a Distributed Feedback Laser With Alternating Structure of Active- and Passive-Cavity

Cited by 2 publications

References 14 publications

A DFB Laser With Integrated Passive Region Suitable for PAM-4 Modulation Signal

A DFB Laser With Integrated Passive Region Suitable for PAM-4 Modulation Signal

A Novel Grating Coupling Coefficient Extraction Method for DFB Laser Diodes Based on Side Mode Spacing

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