Kyoto Semiconductor Co., Ltd.

Dexerials Corporation

Etsuji Omura

Takatomo Isomura

Ken Usui

Yu Itazaki

An optical power supply converter that photoelectrically converts light incident through optical fiber cables is provided with; a reflecting section having a concave reflecting mirror formed with a partially concave surface of an ellipsoid of revolution rotated about a major axis passing through first and second focuses of the ellipse; a light receiving element for photoelectric conversion disposed at the first focus; and an incident portion disposed near the second focus for attaching emitting ends of optical fiber cables that emit light toward the concave reflecting mirror through the second focus.

Optical power supply converter

A semiconductor light receiving element in which a photodiode is formed on the main surface side of a first semiconductor substrate, and a cone ave mirror reflecting an incident light toward the light receiving element. The concave mirror comprises a flat first surface of the second semiconductor substrate that is transparent to the incident light, a convex surface formed in a convex shape toward the side opposite to the first surface on the second surface side opposite to the first surface, and a reflective film formed on the convex surface, and the incident light entering from the first surfaceside is reflected by the reflective film to a condensing positionnear the first surface, and the light receiving element was fixed to the first surface so as to overlap the light focusing position of the concave mirror.

Light receiving device

An optical power supply converter () that photoelectrically converts light from optical fiber cables comprises a reflecting unit () including a concave reflecting mirror () made of a rotating paraboloid, a light receiving element () including a light receiving surface () at the focus of the mirror () orthogonal to the rotation axis of the mirror (), and a plurality of mounting portions () for mounting the emitting ends (OE) of the fiber cables. The seperation distance (s), the shift distance (h) and the divergence angle (&#x3b8;) are set appropriately so as to concentrate all reflected light on the light receiving surface ().

In the optical power supply converters (A toC) having a semiconductor light receiving element () including a light receiving section () on a main surface () side of a semiconductor substrate (), the semiconductor substrate () has at least one inclined end surface () that intersects the main surface () at an acute angle, and the light incident on the inclined end surface () is refracted so as to be incident on the receiving section ().

In an edge incident type semiconductor light receiving device that reflects light incident parallel to the main surface of the semiconductor substrate opaque to the incident light to the light receiving section on the main surface side, a light guide section is formed to expose the light receiving section along the light incident direction from the light incident side end of the semiconductor substrate, and in order to guide the light incident on the light guide section to the light receiving section, a light reflection section having a given crossing angle with the main surface is provided at the end of the light guide section in the light incident direction.

Edge incident type semiconductor light receiving device

A semiconductor light receiving element of back-illuminated type comprises a light absorbing portion formed in the vicinity of the main surface of the semiconductor substrate transparent to the incident light, and a first convex lens portion larger than the light absorbing portion and having a radius of curvature Rformed on a back surface of the semiconductor substrate, a second convex lens portion smaller than the light absorbing portion and having a radius of curvature Rsmaller than the radius of curvature R; the second convex lens portion formed on the first convex lens portion and having a focal point between the second convex lens portion and the light absorbing portion; light incident on the second convex lens portion is diffused from the focal point toward the light absorbing portion.

Semiconductor light receiving element

An edge incident type light receiving element unit capable of receiving optical signals in different wavelength ranges incident from the edge side comprises a first light receiving element for receiving optical signals in a first wavelength range and a second light receiving element for receiving optical signals in a second wavelength range, and configured so that optical signals transmitted through a first light receiving portion formed vertically on a wall portion of a first semiconductor substrate incident via a reflecting portion on a second light receiving portion formed on a second semiconductor substrate fitted on the first semiconductor substrate.

Light receiving element unit

The light receiving element unit includes a first light receiving element having a light receiving region on the main surface side of the first semiconductor substrate and a second light receiving element having a light receiving region on the main surface side of the second semiconductor substrate, and a support substrate having wiring for electrically connecting the first light receiving element and the second light receiving element to the outside, one of the first light receiving element and the second light receiving element has a recess formed in a concave shape from the back surface opposite to the light receiving region toward the light receiving region, and the other is accommodated in the recess.

A semiconductor light receiving element comprises a light absorption region formed in the vicinity of the main surface of the semiconductor substrate transparent to the incident light; an incident region set to be concentric with and larger than the light absorption region; and a partially spherical concave reflecting portion formed on a back surface of the semiconductor substrate and capable of reflecting incident light incident on the incident region from the main surface side toward the light absorbing region; wherein, when the radius of curvature of the portion is R, the diameter of the incident region is B, the distance between the light absorbing region and the concave reflecting portion is W, and the diameter of the light absorbing region is P, then the radius of curvature R satisfies a condition of 2 BW/(B&#x2212;P/2)&#x2264;R&#x2264;2BW/(B&#x2212;P).

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Kyoto, Japan

Etsuji Omura