All-optical demultiplexing of 160–10Gbit∕s signals with Mach-Zehnder interferometric switch utilizing intersubband transition in InGaAs∕AlAs∕AlAsSb quantum well

Abstract

We have developed a Mach-Zehnder interferometric all-optical switch employing intersubband transition in an InGaAs∕AlAs∕AlAsSb-coupled double quantum well waveguide. The recently discovered cross-phase modulation phenomenon was utilized as the switching mechanism; the nonlinear index of refraction for transverse electric polarized light is induced by intersubband optical excitation using transverse magnetic pump light. We demonstrate the demultiplexing operation of 160Gbit∕s data signals to 10Gbit∕s using this switch. At the input control pulse energy of 8pJ, the demultiplexed signals showed an extinction ratio better than 10dB, and an error-free demultiplexing was achieved.

Application of band theory to experimental eigen-state energies of In0.53Ga0.47As quantum wells lattice-matched to InP

“…Optical transition between electron eigen-states in conduction quantum well will be used for high-speed lightwave communication Akimoto et al (2007). It is important in the design of the light detectors to evaluate the effective mass of electron eigen-states.…”

Asymmetric temporal profile of optical Kerr signal from GaAs/AlAs multilayer with λ/2 phase shift layer

“…For the optical Kerr measurement, the input intensity of the pump and probe beams were set at 6 mW and 0.1 mW, respectively. The initial pump beam polarization ( [1][2][3][4][5][6][7][8][9][10]) was set at 45 degree with respect to the initial probe beam polarization y ([010]). The probe beam intensity of the x ([100]) polarization I Kerr (x) was detected as the Kerr signal.…”

“…So far, many types of all-optical switches have been studied and demonstrated using optical nonlinearities of semiconductor materials in 1.55 μm range [1][2][3].…”

Optical Kerr signals of GaAs/AlAs multilayer cavities with two‐photon resonant quantum wells in the half‐wavelength layer

“…Various types of optical switches exploiting ultrafast nonlinear optical responses of semiconductors have been investigated [1][2][3][4][5]. The optical Kerr gate switches using semiconductor nonlinear responses are promising devices with a high onoff ratio and ultrafast operation.…”