High-Accuracy, Sub-μs Wavelength Switching with Thermal Drift Suppression in Tunable Distributed Amplification (TDA-) DFB Laser Array

Kanai, Tatsuaki; Nunoya, Nobuhiro; Yamanaka, Tatsuhiko; Iga, R.; Shimokozono, Makoto; Ishii, H.

doi:10.1364/ofc.2013.oth3i.2

Cited by 10 publications

(8 citation statements)

References 5 publications

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“…As the values of f d1 and f d2 are very large, small difference between λ 1 and λ 2 may cause large errors. It is not rigorous to use two individual single beam LDVs to compose the Janus-configured LDV, as it is almost impossible to keep λ 1 = λ 2 for variation of inside and external conditions, such as frequency drift, temperature influence, stability of drive current and so on [10][11][12]. It is a great challenge to achieve this in the laboratory, not to mention working in the outer field.…”

Section: Principles and Error Analysismentioning

confidence: 99%

Janus‐configured all fibre laser Doppler velocimetry

Fan

Sun

et al. 2018

IET Optoelectronics

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Section: Principles and Error Analysismentioning

confidence: 99%

Janus‐configured all fibre laser Doppler velocimetry

Fan

Sun

et al. 2018

IET Optoelectronics

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“…Furthermore, unlike an electro-absorption (EA) modulator [14,15] and a Mach-Zehnder (MZ) modulator [16][17][18], it is possible to obtain a high extinction ratio (ER) without wavelength-dependent bias control proven in the form of SOA gate switches [19][20]. A residual issue in using an SOA as an optical shutter is thermal crosstalk from the SOA to the laser cavity, which results in a laser frequency drift [21][22][23][24][25]. Methods of compensating for the drift include fast wavelength locking [22], using a dummy injection-current for thermal compensation [24], and optimizing tuning signals by an artificial-intelligence approach [25].…”

Section: Introductionmentioning

confidence: 99%

Hitless Wavelength Switching of Semiconductor Optical Amplifier-integrated Reflection-type Transversal Filter Laser with Suppressed Frequency Error

Ueda

Saito

Shindo

et al. 2023

J. Lightwave Technol.

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A spurious wavelength (spurious) from a tunable laser during tuning is an issue in optical systems based on dynamically controlled laser wavelengths. Output shuttering synchronized with tunable-laser tuning is promising way to suppress spurious. A semiconductor optical amplifier (SOA) is an ideal shutter for laser outputs with spurious in terms of lowwavelength-independent extinction ratio. We developed an electro-optically tunable reflection-type transversal filter (RTF) laser monolithically integrated with an SOA. Thanks to the nanosecond scale tuning speed of the RTF laser, the required shuttering time of the integrated SOA is also a corresponding nanosecond scale, which leads to little temperature change in the laser cavity. As a result, the laser frequency drift after turning off/on the SOA is suppressed to within +/-2.5 GHz without any additional laser control algorithm to compensate for the thermal crosstalk from the SOA. Using the laser, we demonstrated a "hitless" wavelength-switching subsystem based on a coherent format. Namely, outputs from an SOA-RTF laser coded with 32-GBd dual-polarization quadrature phase-shift keying (128 Gbps) are dynamically switched with spurious eliminated by SOA shuttering. In addition to practical bit error rates (BERs) of wavelength channels from the SOA-RTF laser, we observe no interference with the BER of a wavelength channel from another monitor laser in the wavelength-switching subsystem.

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“…Tunable lasers can be used widely in future functional optical systems such as wavelength division multiplexing (WDM) systems and reconfigurable optical add-drop multiplexers (RODAMs). [1] While various methods have already been proposed to achieve semiconductor wavelength tunable laser devices [2]- [6], the cost is now a major factor decides which device can be widely used in commercial market. In-line multi-wavelength laser array is also a device proposed to realize a tunable laser [7], [8], with reconstruction-equivalent chirp (REC) technique, the fabrication of such multi-wavelength array can be simplified and the cost can be lowered [9]- [12].…”

Section: Introductionmentioning

confidence: 99%