Tuning range and threshold current of the tunable twin-guide (TTG) laser

Amann, Markus‐Christian; Illek, S.; Schanen, C.; Thulke, W.

doi:10.1109/68.43336

Cited by 23 publications

(3 citation statements)

References 5 publications

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“…A maximum refractive index change of 1% was assumed as a result of current injection. This amount of index change has been theoretically and experimentally demonstrated in bulk InGaAsP semiconductors (Amann et al 1989;Bennett et al 1990;Schraud et al 1991;Nagai et al 2002), with an even stronger effect observed when multiple quantum wells are employed (Shim et al 1995). The dimensions of the index modulated regions were selected so as to obtain the lowest possible crosstalk for both TE and TM polarizations at a wavelength of 1.55 µm.…”

Section: Switch Designmentioning

confidence: 90%

Robust 2 × 2 Multimode Interference Optical Switch

2006

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A robust 2 × 2 photonic switch based on multimode interference (MMI) effects is proposed. We demonstrate that the device is very tolerant to material modifications and typical fabrication errors. This is a result of the MMI design and the high symmetry of the switch. The key parameter for the operation of the device is that the input light forms a pair of well defined self-images exactly in the middle of the switch. The index modulated regions precisely overlap the positions where these two self-images are formed. By creating identical contact features at these locations, any refractive index change induced in the material as a result of electrical isolation will be replicated in both self-images, and therefore the off-state output will not be altered. In the same way, offset and dimension errors are reflected symmetrically on both self-images and do not seriously affect the imaging. The characteristics of the switch under different scenarios are investigated using the finite difference beam propagation method. By employing this configuration, crosstalk levels better than −20 dB are achievable over a wavelength range of 100 nm while maintaining polarization independence.

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Section: Switch Designmentioning

confidence: 90%

Robust 2 × 2 Multimode Interference Optical Switch

2006

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“…A widely TTG laser [4] is a two section TTG laser [7], in which both sections contain a sampled grating or a superstructure grating with different superperiod. The device structure of a TTG laser ( Fig.…”

Section: Device Structurementioning

confidence: 99%

“…This new concept is based on the tunable twin-guide (TTG) laser concept [7] and uses the Verniereffect to obtain a large tuning range. Electronic tuning over 40-nm wavelength range has recently been demonstrated for these devices [8].…”

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confidence: 99%

Direct modulation of widely tunable twin-guide lasers

Laroy

Todt

Meyer

et al. 2006

IEEE Photon. Technol. Lett.

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Abstract-The possibility to directly modulate widely tunable lasers up to several gigahertz is desirable in telecom applications. We discuss the dynamic properties of the recently proposed widely tunable twin-guide laser concept. It has promising prospects with a maximum theoretical bandwidth above 20 GHz and the 3-dB bandwidth at 250 mA indicates that an actual bandwidth of 12 GHz should be possible. The current lasers were not designed for highspeed modulation, so only 1-GHz modulation can be reached at the moment.

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Tunable twin‐guide (TTG) laser diodes with metal‐clad ridge‐waveguide (MCRW) structure for coherent optical communications

Wolf

Westermeier

Amann

1992

Trans Emerging Tel Tech

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Tunable twin‐guide (TTG) laser diodes with metal‐clad ridge‐waveguide (MCRW) structure were developed for advanced coherent optical communication systems at 1.55 μm wavelength. The essential advantage of these lasers over previous devices is the simplified handling due to the inherent continuous tuning behaviour enabling the unambiguous wavelength control by only one tuning current. With 400 μm long devices, threshold currents around 50 mA, optical output power levels above 10 mW and tuning ranges around 1.2 nm (150 GHz) are achieved by maintaining the linewidth below 4 MHz. With an optimized design a maximum continuous tuning range of 2 nm has been obtained.

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Tuning range and threshold current of the tunable twin-guide (TTG) laser

Cited by 23 publications

References 5 publications

Robust 2 × 2 Multimode Interference Optical Switch

Robust 2 × 2 Multimode Interference Optical Switch

Direct modulation of widely tunable twin-guide lasers

Tunable twin‐guide (TTG) laser diodes with metal‐clad ridge‐waveguide (MCRW) structure for coherent optical communications

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