Soliton Generation in a Semiconductor Circular Ring Laser with a Y-Junction Coupler

Abstract

We report the observation of the emission of solitons from a semiconductor circular ridge waveguide ring laser with a Y-junction coupler. The light-current (L-I) characteristics of the soliton emission through the nonwaveguide region, which refers to the photovoltaic solitons, has a low threshold value and a high quantum efficiency compare to the emission from the Y-junction coupler, and the spectrum of the soliton emission is similar to that of a linear strip laser with multimode emission. The feedback light from the end facet of the Y-junction coupling section continuously enhances the excitation of the photovoltaic solitons through the nonwaveguide region until the lasing condition is reached. It is suggested that the circular ring laser can be an alternative channel to light wave control in integrated optoelectronic system.

Output switching in a semiconductor circular ring resonator due to solitons wave formation

“…The SCRL was fabricated on a metal organic chemical vapor deposition (MOCVD)-grown InGaAlP multiple-quantumwell structure same as previous reported. 13,14) Figure 1 shows the material structure and dimensions of the SCRL device which consisting of a ridge waveguide circular ring resonator with two directional Y-junction output couplers to couple out respectively the clockwise (CW) and counter clockwise (CCW) emission modes in the circular ring resonator. The width of the ridge waveguide was 8 µm for device process tolerance consideration, and the diameters of the circular ring resonator ranged from 200 to 300 µm for different resonance conditions.…”

“…Recently, we had reported the generation of spatial solitons in a III-V multiquantum wells semiconductor circular ring laser device due to nonlinear change in the refractive index and excited by photovoltaic field and electro-optic effects. 13,14) Since the index gradient of the local field could be perturbed by spatial solitons thus is possible to achieve wave guiding or manipulate coupling of light propagation for the integration of electro-optic device. In this experiment, efforts were focused on studying the influence of optical confinement in spatial solitons generation and the coupling characteristics in a circular ring resonator with two Y-junction couplers.…”

The Output Characteristics of a Soliton Cavity Laser Diode

“…The device was fabricated on an MOCVD grown InGaAlP multiple quantum wells structure which is a photovoltaic-photorefractive media and had been shown to have spatial soliton generation under low excitation power level [8]…”

“…There had been reported about the spatial solitons excitation in photorefractive media by low optical power level [1][2][3][4][5][6][7]. Previously, we had presented the generation of spatial solitons on a substrate of MOCVD grown InGaAlP multiple quantum wells structure by the excitation of a circular ring resonator [8]. Here we present the output characteristics of a novel semiconductor laser diode with an intra cavity of soliton generated waveguide.…”

Output Characteristics of a Semiconductor Laser Diode with Double Ring Cavities and a Y-Junction Coupler

“…[16][17][18][19][20][21][22][23][24][25] Recently, an SCRLD has been demonstrated to generate a spatial soliton waveguide and control the transmission property of the output characteristics of the laser diode device. 26,27) A superluminescent diode (SLD) is a light source based on the superluminescence of high power and low coherence, which is useful in laser tomography for bioinspection or medical inspection, and in an external cavity tunable laser source for fiber optics communications. An SLD is normally designed to have a high single pass amplification for the emission along the waveguide cavity with an insignificant feedback, and can be successfully achieved by tilting waveguide and antireflection-coated facets.…”