Sub-&amp;lt;tex&amp;gt;$muhboxs$&amp;lt;/tex&amp;gt;Switching Time in Silicon-on-Insulator Mach–Zehnder Thermooptic Switch

Harjanne, Mikko; Kapulainen, Markku; Aalto, Timo; Heimala, Päivi

doi:10.1109/lpt.2004.833896

Cited by 106 publications

(53 citation statements)

References 9 publications

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“…Furthermore, the optical path lengths connecting between cascaded MZIs cannot be controlled at the fabrication stage to a sub-wavelength precision. Hence, metallic resistors must be deposited in proximity to the waveguides [31], [32]. The driving of currents through the resistors would locally heat the nearby silicon structure, and modify its refractive index through the thermo-optic effect mentioned above [24].…”

Section:  mentioning

confidence: 99%

All-Optical Signal Processing for High Spectral Efficiency (SE) Optical Communication

Ezra¹,

Lembrikov²,

Zadok³

et al. 2012

Optical Communication

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The need for CP can be avoided if the wavelet packet transform (WPT) is used in CO-OFDM systems instead of discrete Fourier Transform (DFT) and inverse DFT (IDFT) [13]. The sinusoidal functions are infinitely long in the time domain while wavelets have finite length being localized in time and in frequency domains [13]. Wavelet signal analysis can be a base for an effective computational algorithm which is faster and simpler than FFT [14]. Wavelets have been used in optical communications for time-frequency multiplexing and ultrafast image transmission [14]. A signal may be expanded in an orthogonal set of wavelet packets (WPs) as the basis functions, each channel occupies a wavelet packet (WP), and IDWPT/ DWPT are used at the transmitter and receiver, respectively [13].In this chapter, we consider the CO-OFDM based on WPT and its influence on the optical communication network performance. The chapter is constructed as follows. In Section 2, we review the coherent optical communication systems. In Section 3, we discuss high SE CO-OFDM system. In Section 4, we discuss the OFDM based on WPT and present the original results for the WPT-OFDM system performance. In Section 5, we present the original results concerning the simulations of the structure and operation mode of the novel passive components for all-optical signal processing based on Si-on-insulator (SOI) structure, and a novel hierarchical architecture of the 1Tb/s transmission system based on WPT-OFDM [15]. In Section 6, conclusions are presented.

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Section:  mentioning

confidence: 99%

All-Optical Signal Processing for High Spectral Efficiency (SE) Optical Communication

Ezra¹,

Lembrikov²,

Zadok³

et al. 2012

Optical Communication

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show abstract

“…6, while a practical realization of the technique was shown on a Mach-Zehender device. 16 It should be noted, in addition, that there is only an apparent system complication. On the contrary, with the proposed approach we eliminate, in principle, the need of expensive and inefficient Peltier heat pumps, always present in thermally controlled devices to hold the device at a fixed temperature.…”

Section: Theoretical Approachmentioning

confidence: 99%

Modulation speed improvement in a Fabry–Perot thermo-optical modulator through a driving signal optimization technique

et al. 2009

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Abstract. A three-power-level method for obtaining efficient thermooptical modulation in an all-silicon waveguide-integrated Fabry-Perot thermo-optic modulator is discussed by means of a thermo-optical analytical model and demonstrated. The thermal system is represented as a two-pole model where, at every time, the temperature in the waveguide core is modified by means of a heater. This temperature is calculated and used in turn for calculating the refractive index. In this way, the impact of the driving signal shape on the device speed performance is assessed. Results clearly indicate that the application of a thermal bias holding the modulator at a higher average temperature with respect to the substrate heat sink allows increasing the modulator speed. An application-specific integrated circuit has been designed and developed in order to test the new modulation logic. The system's electronics is implemented in a 0.8 m, 5 V, CMOS process. The experimental results of this new three-power-level driver method are reported, showing the shortening of the characteristic transient times.

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“…The large refractive index difference between the silicon layer and the oxide layer provides high optical confinement. Mach-Zehnder interferometric SOI optical switches with thermo-optic (TO) phase shifters have been fabricated (Treyz 1991;Harjanne et al 2004;Chu et al 2005). A phase shift with TO effect is obtained to change the refractive index of the waveguide by using a thin film heater.…”

Section: Introductionmentioning

confidence: 99%

Mach-Zehnder interferometric optical switch with MEMS phase shifter

2009

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Sub-<tex>$muhboxs$</tex>Switching Time in Silicon-on-Insulator Mach–Zehnder Thermooptic Switch

Cited by 106 publications

References 9 publications

All-Optical Signal Processing for High Spectral Efficiency (SE) Optical Communication

All-Optical Signal Processing for High Spectral Efficiency (SE) Optical Communication

Modulation speed improvement in a Fabry–Perot thermo-optical modulator through a driving signal optimization technique

Mach-Zehnder interferometric optical switch with MEMS phase shifter

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