Stable wavelength switching within 50 ns using tunable distributed amplification (TDA-) DFB lasers

Onji, Hirokazu; Takeuchi, Shota; Tatsumoto, Yudai; Kato, Kazutoshi; Nunoya, Nobuhiro; Shimokozono, Makoto; Ishii, H.

doi:10.1109/coin.2014.6950586

Cited by 2 publications

(2 citation statements)

References 2 publications

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“…From these results, we confirm that the proposed wavelength control system is effective in fast wavelength stabilization of the TDA-DFB laser and the switching time is shorter than that in our previous control system with external equipment such as the MZI and high-speed PDs. In the future, by combining feedforward and feedback control, the effectiveness of which we have already confirmed and with which we achieved 320 ns wavelength switching with the external locker, [31][32][33][34] the switching time will be improved to be less than 300 ns with the internal wavelength locker.…”

Section: Resultsmentioning

confidence: 54%

Sub-microsecond wavelength stabilization of tunable lasers with the internal wavelength locker

Kimura

Tatsumoto

Sakuma

et al. 2016

Jpn. J. Appl. Phys.

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We proposed a method of accelerating the wavelength stabilization after wavelength switching of the tunable distributed amplification-distributed feedback (TDA-DFB) laser using the internal wavelength locker to reduce the size and the cost of the wavelength control system. The configuration of the wavelength stabilization system based on this locker was as follows. At the wavelength locker, the light intensity after an optical filter is detected as a current by the photodiodes (PDs). Then, for estimating the wavelength, the current is processed by the current/voltage-converting circuit (IVC), logarithm amplifier (Log Amp) and field programmable gate array (FPGA). Finally, the laser current is tuned to the desired wavelength with reference to the estimated wavelength. With this control system the wavelength is stabilized within 800 ns after wavelength switching, which is even faster than that with the conventional control system.

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Section: Resultsmentioning

confidence: 54%

Sub-microsecond wavelength stabilization of tunable lasers with the internal wavelength locker

Kimura

Tatsumoto

Sakuma

et al. 2016

Jpn. J. Appl. Phys.

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“…This technique enabled high-speed (<100 ns) wavelength switching. [27][28][29][30][31][32][33] In addition, by adapting feedback control technology, long-term thermal drift is canceled and long-term wavelength stabilization was realized. [33][34][35] Our proposed current control technique enabled us to switch the wavelength of a single TDA-DFB laser in a range of 6 nm.…”

Section: Introductionmentioning

confidence: 99%

High-speed and long-term wavelength stabilization of tunable distributed amplification distributed feedback laser after laser activation with feedforward and feedback control

Fukuda

Yamaguchi

Kuboki

et al. 2018

Jpn. J. Appl. Phys.

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To manage recent exponentially increasing data traffic, optical-to-optical burst switching and packet switching systems have been attracting much attention because they do not require an optical-to-electrical and an electrical-to-optical conversions. These systems require high-speed optical switches with a large number of input/output ports. As a candidate for the optical switch, we have focused on the combination of wavelength tunable lasers and an arrayed waveguide grating router, and studied the tunable distributed amplification distributed feedback (TDA-DFB) lasers for the optical switch. Previously, our derived feedforward current control achieved high-speed wavelength switching at a single laser in six-arrayed TDA-DFB lasers. For larger-scale optical switching, wavelength switching from a laser to another in an array is required to cover a wide tunable range. In this study, we develop a novel current control model and successfully stabilize the wavelength immediately after laser activation, which would enable high-speed switching between different lasers. Furthermore, we demonstrate the combination of feedforward and feedback controls for high-speed switching with long-term stability.

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Stable wavelength switching within 50 ns using tunable distributed amplification (TDA-) DFB lasers

Cited by 2 publications

References 2 publications

Sub-microsecond wavelength stabilization of tunable lasers with the internal wavelength locker

Sub-microsecond wavelength stabilization of tunable lasers with the internal wavelength locker

High-speed and long-term wavelength stabilization of tunable distributed amplification distributed feedback laser after laser activation with feedforward and feedback control

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