Samsung Electronics Co., Ltd.

Ho-In Kim

Seong-Taek Hwang

In-kuk Yun

Jeong-seok Lee

Hyun-Cheol Shin

Seung-woo Kim

Yun-Je Oh

Jeong-Seok Lee

Seung-Woo Kim

A gain-clamped semiconductor optical amplifier is disclosed. The amplifier includes a gain waveguide for amplifying an optical signal input to the gain waveguide, and a grating layer, in contact with the gain waveguide, having a first grating disposed at a first end portion.

Gain-clamped semiconductor optical amplifier

Disclosed are optical signal transmission apparatus including a reflective gain-clamped semiconductor optical amplifier and optical communication system using the optical signal transmission apparatus, which can improve modulation speed and optical power by effectively suppressing intensity noise of an incoherent light source. The optical signal transmission apparatus comprises a light source; a reflective gain-clamped semiconductor optical amplifier to generate gain-clamped optical signals having a substantially constant output intensity in a gain saturation region; a wavelength division multiplexing apparatus configured to spectrum-slice light from the light source, provide the spectrum-sliced light to the reflective gain-clamped semiconductor optical amplifier, and multiplex optical signals gain-clamped by the reflective gain-clamped optical amplifier, and a circulator for inputting the light generated by the light source to the wavelength division multiplexing apparatus, and outputting the optical signal multiplexed by the wavelength division multiplexing apparatus to a transmission link.

Optical signal transmission apparatus including reflective gain-clamped semiconductor optical amplifier

A reflective semiconductor optical amplifier includes a substrate, a waveguide with a buried heterostructure formed by sequentially laminating a lower cladding, an active layer, and an upper cladding on the substrate, the waveguide including, sequentially, respective straight line, curved and tapered waveguide regions. A current blocking layer surrounds the waveguide to prevent electric current from flowing outside the active layer. Selectively etching portions of the current blocking layer and the substrate around the waveguide forms a trench to reduce parasitic capacitance. Further features include a window region on one end of the tapered waveguide region, an anti-reflection surface on one end of the window region, and a high-reflection surface on one end of the straight line waveguide region.

Reflective semiconductor optical amplifier

A gain-clamped semiconductor optical amplifier capable of providing constant gain for output optical signals at substantially all times is disclosed. In particular, the gain-clamped semiconductor optical amplifier according to the present invention comprises a active waveguide having an input and output side; clad layers surrounding the active waveguide; and a grating, which is formed partially at both end parts under the input and output sides of the active waveguide.

Disclosed is an optical communication module comprising: an active optical device includes a first optical waveguide through which light passes; and an optical waveguide device including a second optical waveguide, the second optical waveguide having an input end surface through which the light emitted from an output end of the first optical waveguide is incident to the second optical waveguide, wherein the output end of the first optical waveguide has a first unit vector which represents a direction in which light passing a predetermined first point on the output end proceeds.

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Yongin-si, South Korea

Ho-In Kim