Stable and Fast Wavelength Switching in Digitally Tunable Laser Using Chirped Ladder Filter

Matsuo, Shinji; Jeong, Seok–Hwan; Segawa, Takehiko; Okamoto, Hiroshi; Kawaguchi, Yoshihiro; Kondo, Y.; Suzuki, H.; Yoshikuni, Y.

doi:10.1109/jstqe.2007.903852

Cited by 11 publications

(3 citation statements)

References 16 publications

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“…The concept of optical frequency hopping, essential for THz communications, can be effectively realized through the adjustment of tunable light sources. Advanced research in this field [18][19][20][21][22][23][24][25][26][27][28][29] has highlighted the tunable distributed feedback laser array (TLA) as a particularly suitable technology for next-generation optical networks. This is attributed to its capability for no mode-hopping and a relatively simple DFB design.…”

Section: Conception Of Tla-driven Thz Frequency Hoppingmentioning

confidence: 99%

Demonstration of THz frequency hopping in the 300 GHz band based on UTC-PD and tunable DFB laser array

Li,

Ye,

Che

et al. 2024

Jpn. J. Appl. Phys.

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We explored the potential of an optoelectronic frequency hopping system within the 300 GHz band, leveraging a tunable distributed feedback (DFB) laser array and uni-traveling carrier photodiode (UTC-PD). Our experiments successfully achieved a 10-channel terahertz (THz) frequency hopping, marking a significant advancement in THz secure communication technologies. Notably, the system exhibited a rapid frequency-hopping capability with a short transition time of 0.8 ms between channels, ranging from 288 GHz to 331 GHz. Further, we conducted data transmission tests at a rate of 5 Gbit/s across several channels. The results were promising, showing each channel maintained a clear eye pattern and a low bit error rate, crucial factors for reliable and secure data transmission. These findings not only demonstrate the efficacy of our system but also open new avenues for high-speed, secure THz communication.

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Section: Conception Of Tla-driven Thz Frequency Hoppingmentioning

confidence: 99%

Demonstration of THz frequency hopping in the 300 GHz band based on UTC-PD and tunable DFB laser array

Li,

Ye,

Che

et al. 2024

Jpn. J. Appl. Phys.

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show abstract

“…3,4) For example, next-generation passive optical network 2 (NG-PON 2) requires sub-second timescale wavelength tunable lasers to minimize the network delay. [5][6][7] To date, several kinds of high-speed tunable lasers have been developed [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] However, these lasers have some drawbacks, such as poor single-mode stability and the need for a complex fabrication process. Tunable distributed feedback (DFB) laser array (TLA) is suitable for the nextgeneration optical network because of free mode-hopping and a relatively simple DFB design.…”

Section: Introductionmentioning

confidence: 99%

Strategy of full-C-band fast wavelength switching and aging mitigation at tunable DFB laser array with current/temperature cooperative control

Chen

Ibrahim

et al. 2022

Jpn. J. Appl. Phys.

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We proposed a current/temperature cooperative control to solve the problem of laser aging in the conventional fast wavelength switching method when injecting a larger current at the tunable distributed feedback (DFB) laser array (TLA). Previously, we demonstrated a 400-GHz-wide uni-directional switching at a single DFB laser in the TLA with the cooperative control, which switched fastly and retarded laser aging. For large-scale optical communication systems, we have improved the cooperative control method and expanded its application scenarios. In this paper, we not only proposed and achieved bi-directional wavelength switching with cooperative control at a single DFB laser but also realized bi-directional wavelength switching with cooperative control covering full-C-band at two DFB lasers of the TLA. We demonstrated that the switching time is less than 200 ms and estimated that the TLA’s lifetime is improved by more than 40 times.

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“…Small changes in the current or temperature of these components do not influence the emitted wavelength. The filtered feedback section can be achieved for example using a chirped ladder filter [16]. However, complicated current control is needed for the different components.…”

Section: Introductionmentioning

confidence: 99%

Wavelength tuning speed in semiconductor ring lasers using on-chip filtered optical feedback

Verschaffelt

Khoder

Nguimdo

et al. 2014

Silicon Photonics and Photonic Integrated Circuits IV

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Semiconductor ring lasers are promising sources in photonic integrated circuits because they do not require cleaved facets or mirrors to form a laser cavity. In this work, we characterize the wavelength switching speed of a tunable semiconductor ring lasers using filtered optical feedback. The filtered optical feedback is realized by employing two arrayed waveguide gratings to split/recombine light into different wavelength channels. Semiconductor optical amplifiers are placed in the feedback loop in order to control the feedback of each wavelength channel independently. The wavelength switching is achieved by changing the currents injected in the semiconductor optical amplifier gates. Experimentally, we observe a wavelength transition time of 5 ns. However, we also noticed a non-negligible delay in the switching process. [ Khoder et al, IEEE Photon. Technol. Lett. 26, 520-523, 2014]. We numerically reproduce the experimental results using rate equations taking into account the effect of spontaneous emission. The simulations further elaborate on the effect of the noise strength on the wavelength transition time and the delay time.

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Stable and Fast Wavelength Switching in Digitally Tunable Laser Using Chirped Ladder Filter

Cited by 11 publications

References 16 publications

Demonstration of THz frequency hopping in the 300 GHz band based on UTC-PD and tunable DFB laser array

Demonstration of THz frequency hopping in the 300 GHz band based on UTC-PD and tunable DFB laser array

Strategy of full-C-band fast wavelength switching and aging mitigation at tunable DFB laser array with current/temperature cooperative control

Wavelength tuning speed in semiconductor ring lasers using on-chip filtered optical feedback

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