Digitally tunable ring laser using ladder filter and ring resonator

Matsuo,; Jeong, Jeong; Segawa,; Okamoto,; Kawaguchi,; Kondo,; Сузуки,; Yoshikuni,

doi:10.1109/islc.2004.1382796

Cited by 6 publications

(13 citation statements)

References 4 publications

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“…5,6) To overcome these shortcomings, we have proposed a digitally tunable laser employing a ladder interferometric tunable filter and a ring resonator. 7,8) Relative oscillation frequency spacing is determined by the geometry of the intracavity ring resonator. Also, the ladder interferometric tunable filter acts as an oscillation-mode selector.…”

Section: Introductionmentioning

confidence: 99%

Ladder-Type Tunable Filter Connected by High-Diffraction-Order Ladder Interferometer for Use in Widely Tunable Laser Diodes

Jeong¹,

Matsuo²,

Yoshikuni³

et al. 2005

Jpn. J. Appl. Phys.

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We propose and demonstrate a novel ladder-type tunable filter cascade-connected by a high-diffraction-order ladder interferometer, and discuss its potential application to a high-performance laser source having high output power and a wide tuning range. We design a novel ladder interferometric tunable filter that satisfies such essential requirements as having a narrow bandwidth for stable single longitudinal oscillation mode control together with a low insertion loss, a low wavelength-sensitive filter spectrum, a wide free-spectral range and a wide tuning range. We successfully demonstrate all of these characteristics in the fabricated device.

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Section: Introductionmentioning

confidence: 99%

Ladder-Type Tunable Filter Connected by High-Diffraction-Order Ladder Interferometer for Use in Widely Tunable Laser Diodes

Jeong¹,

Matsuo²,

Yoshikuni³

et al. 2005

Jpn. J. Appl. Phys.

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“…For the reported cases, a tuning range was 7.2 nm for a multi-electrode DFB laser [24], 8 nm for a TTG DFB laser [26], and 5.8 nm for a multi-electrode DBR laser [27]. Then, to get wide tunability within the whole C-band and/or L-band, special structure should be introduced, for example, arrayed DFB lasers with several wavelengths [31,32], multi-electrode structure such as a super structure grating (SSG), a sampled grating (SG), a digitally sampled grating (DS) DBR laser [33][34][35], and the integration structure using an SOA and a wavelength-selective filter such as a ladder filter, ring resonators, a movable grating with an MEMS, or a liquid crystal tunable filter [36][37][38][39][40][41][42]. This section focuses on those structures.…”

Section: Reported Technologies and Issues Of Tunable Semiconductor Lamentioning

confidence: 99%

“…Compared to a DFB and a DBR laser, the gain bandwidth is wider for the external cavity laser because current injection level can be higher by the use of an SOA. For a tunable wavelength filter, several kinds have been demonstrated such as ring resonators [37,39,42], a ladder filter [36], and so on. And as for the structure, hybrid integration of an SOA and a planar lightwave circuit (PLC)-type waveguide filter [39,42](an example is shown in Fig.…”

Section: External Cavity Lasermentioning

confidence: 99%

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Semiconductor Lasers for High-Density Optical Communication Systems

Uenohara

2010

High Spectral Density Optical Communication Technologies

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Semiconductor lasers have several advantages compared to other types of lasers (a fiber ring laser, a solid-state laser, a gas laser), such as compactness, integrability to other components (a modulator, a power monitor photodiode, a wavelength tuning component). In addition, a monolithic tunable laser can be fabricated in the semiconductor by combining wavelength tuning regions and a phase control region together with an active region. That is why a monolithic integrated semiconductor tunable laser is very attractive not only for a compact light source for large-capacity, optical communication systems but also for economical backup resource. However, there are several technical issues to achieve high-quality semiconductor tunable lasers applicable to high-density optical communication systems due to the severe requirements of narrow spectral linewidth, wide tunability, and high wavelength stability.In this chapter, several technical methodologies for improving spectral linewidth and wavelength tunability are overviewed. Requirements to Spectral LinewidthFor realization of large-capacity and long-haul WDM optical transmission systems, significant distortion by both chromatic and polarization mode dispersion should be overcome. For that solution, modulation scheme with narrow signal bandwidth is the recent trends. For example, multi-level modulation format, such as DQPSK and M-QAM, and multi-carrier modulation, such as OFDM, have been intensively investigated. For these modulation schemes, high-sensitive receiver is necessary, and therefore, transmission signal is detected with digital coherent detection technique. Therefore, even for a tunable semiconductor laser, narrow spectral linewidth

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“…We have developed a digitally tunable laser containing a widely tunable ladder filter combined with a ring resonator [9]- [11]. The passband of the ring resonator is narrower than that of the AWG filter, thus, improving the stability of the lasing mode.…”

Section: Introductionmentioning

confidence: 99%

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

Matsuo

Jeong

Segawa

et al. 2007

IEEE J. Select. Topics Quantum Electron.

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We propose a digitally tunable ring laser incorporating a chirped ladder filter and a ring resonator. The widely tunable ladder filter selects one channel from the periodic outputs of the ring resonator. Therefore, it is easy to change the lasing wavelength of this device. To obtain stable lasing operation, we employ chirping in the ladder filter. The chirped ladder filter has one dominant passband, and other peaks corresponding to the free-spectral range are suppressed. The device is monolithically integrated by using the InP-InGaAsP material system. The device is capable of 34-channel (100-GHz spacing) digitally tunable laser operation, and the sidemode suppression ratio is more than 40 dB. The switching time for any wavelength is less than 8 ns, and the frequency drift caused by the thermal transient is less than 500 MHz.Index Terms-Ladder filter, ring resonator, tunable laser, wavelength division multiplexing (WDM).

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Digitally tunable ring laser using ladder filter and ring resonator

Cited by 6 publications

References 4 publications

Ladder-Type Tunable Filter Connected by High-Diffraction-Order Ladder Interferometer for Use in Widely Tunable Laser Diodes

Ladder-Type Tunable Filter Connected by High-Diffraction-Order Ladder Interferometer for Use in Widely Tunable Laser Diodes

Semiconductor Lasers for High-Density Optical Communication Systems

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

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