Dynamically reconfigurable optical packet switch (DROPS)

Huang, C.-H.; Chou, Hsu-Feng; Bowers, John E.; Toudeh-Fallah, F.; Gyurek, R.

doi:10.1364/oe.14.012008

Cited by 13 publications

(2 citation statements)

References 7 publications

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“…Many of these advances involve lasers with complex gain media, such as semiconductor lasers [1,2], quantum cascade lasers [3,4], and rotationally excited gases [5], for which the two level atomic system approximation is poorly suited. For example, though the band structure of the semiconductor gain medium can be approximated as a series of two level atomic transitions, multiple transitions are required to represent the effects of Pauli blocking [6]. Cascaded-transition quantum cascade lasers are designed with two lasing transitions to operate at longer wavelengths [7,8].…”

Section: Introductionmentioning

confidence: 99%

Steady-state ab initio laser theory for complex gain media

Cerjan¹,

Chong²,

Stone³

2015

Opt. Express

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We derive and test a generalization of the steady-state ab initio laser theory (SALT) to treat complex gain media. The generalized theory (C-SALT) is able to treat atomic and molecular gain media with diffusion and multiple lasing transitions, and semiconductor gain media in the free carrier approximation including fully the effect of Pauli blocking. The key assumption of the theory is stationarity of the level populations, which leads to coupled self-consistent equations for the populations and the lasing modes that fully include the effects of openness and non-linear spatial hole-burning. These equations can be solved efficiently for the steady-state lasing properties by a similar iteration procedure as in SALT, where a static gain medium with a single transition is assumed. The theory is tested by comparison to much less efficient finite difference time domain (FDTD) methods and excellent agreement is found. Using C-SALT to analyze the effects of varying gain diffusion constant we demonstrate a cross-over between the regime of strong spatial hole burning with multimode lasing to a regime of negligible spatial hole burning, leading to gain-clamping, and single mode lasing. The effect of spatially inhomogeneous pumping combined with diffusion is also studied and a relevant length scale for spatial inhomogeneity to persist under these conditions is determined. For the semiconductor gain model, we demonstrate the frequency shift due to Pauli blocking as the pumping strength changes.

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Section: Introductionmentioning

confidence: 99%

Steady-state ab initio laser theory for complex gain media

Cerjan¹,

Chong²,

Stone³

2015

Opt. Express

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“…Routing has been achieved with the switch that is composed of AWG, TWCs and fixed wavelength converters (FWCs) per wavelength channel in many OPS and OBS systems proposed and implemented so far [1] [2]. Its routing speed and scalability are very high.…”

Section: Introductionmentioning

confidence: 99%

Optical Switching Node with Different Shared Devices for Contention Avoidance and Its Performance

Yatsuo¹,

Tode²,

Nishimura

et al. 2007

2007 Photonics in Switching

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Optical switching node with a high-speed matrix optical switch that shares high-cost devices for contention avoidance, i.e. tunable wavelength converters (TWCs) or fiber delay lines (FDLs), is developed. However, a quantitative performance hadn't been evaluated enough so far since mainly small-scale prototype switch was developed and the operation verification by the basic experiment was done. In this paper, the switching behavior on a switching node that shares both TWCs and FDLs for contention avoidance is newly established and its performance is evaluated by using computer simulations. Finally, effective composition of both devices for contention avoidance is examined.

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