Two-Wavelength Switching With a 1550 nm VCSEL Under Single Orthogonal Optical Injection

Optical neuron using polarisation switching in a 1550nm-VCSEL

“…2(a)] into the orthogonally polarised mode of the VCSEL (λ VCSEL ). If this orthogonally-polarised signal is powerful enough, PS is induced [10][11][12][13][14]. In this situation, the parallel polarised lasing mode is suppressed, the orthogonal polarisation mode is activated and thus the polarisation of the light at the output of the VCSEL switches from parallel to orthogonal [as shown graphically in the upper right plot of Fig.…”

“…We demonstrate that the neural response to excitatory and inhibitory stimuli can be reproduced experimentally with a 1550 nm VCSEL (SL) subject to double optical injection (two MLs) using parallel and orthogonal polarisation. Under these conditions we can induce polarisation switching (PS) [10][11][12][13][14], where the polarisation of the light emitted by the VCSEL determines the state of the VCSEL-Neuron, active (orthogonal) or inactive (parallel). Moreover the mode structure of the solitary VCSEL [10][11][12][13][14][15], with a parallel polarised dominant mode and an orthogonally-polarised subsidiary mode, aligns with that needed to perform the optical neuron operation [1], thus obviating the need for longitudinal mode selection through external optical feedback.…”

Stability of the nonlinear dynamics of an optically injected VCSEL

“…The latter range from periodic oscillatory output to chaotic behavior [5,6]. The complex nonlinear dynamics arising from optical injection have been investigated using a variety of semiconductor lasers, including edge-emitting Fabry Perot [6], distributed feedback (DFB) [7], multi-section [8] and vertical cavity surface emitting laser (VCSEL) devices [9][10][11][12][13][14][15][16][17][18][19].…”

“…835-845 nm) [12,13], and long wavelength (approx. 1.5 µm) VCSELs [14,15], injection locking [16,17], nonlinear dynamics and chaos [10,11,18,19].…”

Control of emitted light polarization in a 1310 nm dilute nitride spin-vertical cavity surface emitting laser subject to circularly polarized optical injection

“…PS and PB have been experimentally examined under polarized optical injection in conventional VCSELs emitting at shortwavelengths [33][34][35][36] and long-wavelengths. [37][38][39][40][41] Polarized optical injection (parallel, orthogonal, [42][43][44] and elliptical [45][46][47] ) has been applied in conventional VCSELs to obtain PS and PB between the two linear and orthogonal polarizations of the device, from parallel to orthogonal polarization and vice versa. However, reports of circularly polarized injection in conventional VCSELs are very limited.…”