JP3537485B2 - Optical package - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device and a light receiving device comprising an optical fiber, a laser diode (LD), a light emitting diode (LED), a photodiode (PD), and an optical integrated circuit (OEIC). The present invention relates to an optical package for spatially propagating an optical signal in the optical package.

[0002]

2. Description of the Related Art Conventionally, for example, when optical coupling between an optical fiber and an optical integrated circuit is performed, as shown in a schematic perspective view of FIG.
An optical package having a V-shaped groove 13 for installing an optical fiber and a lead pin 15 connected to an optical integrated circuit (see Japanese Utility Model Application Laid-Open No. 61-17 / 1986).
No. 6512), or as shown in the schematic perspective view of FIG. 4, a hole 14 for inserting and fixing an optical fiber 17 is provided on the bottom surface of the mounting body 11 so that a surface serving as a light emitting unit and a light receiving unit is mounted. The optical integrated circuit 16 is located on the bottom side of the body 11.
Optical package (Jpn.
No. 58).

[0003]

However, the structure of a conventional optical package is such that a mounting body 11 for mounting an IC chip is provided with a V-groove 13 and a hole 14 for installing an optical fiber. Due to the area limitation when installing the optical fiber 17 or the influence of surplus light on the light other than the target coupled light receiving element, the plurality of optical integrated circuits 16 and the optical fiber
However, there has been a problem that the optical package cannot be coupled with high precision, and the optical package cannot have a structure that can be realized in a small size.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a light emitting element and a light receiving element are provided on opposing inner surfaces, respectively, and an optical signal is transmitted from the light emitting element to the light receiving element. In an optical package configured to propagate in space, the light-emitting element and the light-receiving element are disposed on inner surfaces, one of which is opposed to the other, and the light path of an optical signal emitted from the light-emitting element is changed to a light-receiving element. This is an optical package in which an optical path conversion element such as a hologram for changing the direction is provided between the two elements.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. The schematic cross-sectional view of FIG. 1 shows an optical package 1 which is a pentagonal house type, and a certain surface of the optical package 1 is used as an optical integrated circuit installation surface 2 for installing an optical integrated circuit, and for installing an optical fiber. In this embodiment, when the optical integrated circuit installation surface 2 is the A surface, the other surfaces are the B surface, the C surface, and the D surface from the clockwise direction of the optical integrated circuit installation surface 2 in this embodiment.
Surface, the optical fiber installation surface 3 is C surface, D surface
Face. In the optical package 1, a plurality of optical integrated circuits 6 to which bonding wires 4 and lead pins 5 for transmitting electric signals to the outside are connected are installed on the optical integrated circuit installation surface 2, and an optical fiber installation surface 3 is provided. A plurality of optical fibers 7 are installed, and the hologram 8 is installed in a state where the hologram 8 extends from the corners of the planes B and C to the corners of the planes D and E. In this embodiment, the optical integrated circuit 6 is used as a light receiving element, and the optical fiber 7 is used as a light emitting element. The hologram 8 has a diffraction grating for forming an optical path in which the coupling between each of the target optical fibers 7 and the light emitting portion or the light receiving portion of the optical integrated circuit 6 has a low loss. Use

As described above, the pentagonal house type optical package 1 is used, and the optical fiber 7 and the optical integrated circuit 6 are used.
By interposing the hologram 8 during the propagation of the optical signal between the hologram 8 and the light receiving portion of the optical integrated circuit 6, even when the optical signal is propagated between the plurality of optical fibers 7 and the light receiving section of the optical integrated circuit 6, the hologram 8 has a subtle optical path conversion action. Optical coupling can be made with low loss and high precision. Also, the optical fiber installation surface 3
Is formed so as to be inclined with respect to the optical integrated circuit installation surface 2, so that the optical fiber installation surface 3 can be sufficiently secured while maintaining the miniaturization of the optical package 1, and light can pass through the hologram 8. Surplus light that reaches other than the light receiving portion of the target optical integrated circuit, such as the zero-order light that does not change the optical path later,
Since the light signal is spread without being condensed, the signal is weak as an optical signal, and since the light signal is obliquely incident on the light receiving element, the light has no influence except on the target coupled light receiving element. Further, when the optical fiber 7, which is a light emitting element, is oblique to the hologram 8, the 0th-order light travels obliquely, so that the 0th-order light travels between the hologram 8 and light receiving elements other than the target coupled light receiving element. A sufficient distance can be provided, the influence of surplus light can be further reduced, and a smaller optical package 1 can be obtained. In this embodiment, only the pentagonal house type optical package 1 has been described. However, the optical fiber installation surface 3 is inclined with respect to the optical integrated circuit installation surface 2 and the light emitting portion of the optical integrated circuit 6 or A hologram 8 is provided at a portion where an optical signal is spatially propagated between the light receiving portion and the optical fiber 7.
Any shape may be used as long as the optical package 1 can be interposed. For example, as shown in a schematic sectional view of FIG. The surfaces 2 and 1 may be formed by the hologram 8, and the optical fiber array 9 may be installed from the outside. The hologram 8 to be installed may be any one that can be installed between the optical paths between the optical fiber 7 and the optical integrated circuit 6.
The thickness and the installation method are arbitrary. In this embodiment, the optical fiber 7 is used as the light emitting element and the optical integrated circuit 6 is used as the light receiving element. However, the optical signal between the elements such as the reverse or optical fiber, laser diode, light emitting diode, photodiode, and optical integrated circuit is used. It can be used for any propagation. Further, when installing the optical fiber 7 on the optical fiber installation surface 3, a hole is provided in the optical fiber installation surface 3 and the optical fiber 3 is inserted and fixed in the hole, or at least the optical fiber on the optical fiber installation surface 3 The portion to be connected to the fiber may be provided by a method of forming the material through which light can pass.

Although the hologram 8 is used in this embodiment, another optical path changing element may be used. The optical path conversion element is an element that converts an optical path of an optical signal emitted from a light emitting element toward a target light receiving element, and includes a diffractive optical element or a refraction optical element. Diffractive optical elements are optical elements that utilize the phenomenon of light diffraction, as represented by holograms, gratings, photorefractive crystals, and Fresnel lenses. This is an element that converts light path by diffracting light by a diffraction grating having irregularities formed thereon. A refraction-type optical element is an element that uses the phenomenon of refraction of light to convert a light flux, as represented by a lens or an optical prism, and has a shape of an incident surface of light or an incident angle to the incident surface. Is an element that converts light path by refracting light by obtaining refraction according to the following.

[0008]

As described above, according to the optical package of the present invention, the light emitting element and the light receiving element are disposed on the inner surfaces, one of which is opposed to the other, and the light is emitted from the light emitting element. By providing an optical path conversion element such as a hologram for converting the optical path of the optical signal in the direction of the light receiving element between the two elements, it is possible to sufficiently secure the light receiving element or light emitting element mounting surface in a small state, and to use a plurality of light emitting elements. It is possible to provide an optical package that can make each optical coupling between the light receiving elements with low loss and high precision, and suppress the influence of excess light arriving at other than the target coupled light receiving element.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an optical package of the present invention.

FIG. 2 is a schematic sectional view showing an optical package of the present invention.

FIG. 3 is a schematic perspective view showing a conventional optical package.

FIG. 4 is a schematic perspective view showing a conventional optical package.

[Explanation of symbols]

1: Optical package 8: Hologram 2: Optical integrated circuit installation surface 9: Optical fiber array 3: Optical fiber installation surface 11: Mounting body 4: Bonding wire 12: Lid 5, 15: Lead pin 13: V
Grooves 6, 16: Optical integrated circuit 14: Hole 7, 17: Optical fiber

Claims (1)

(57) [Claims] 1. An optical package having a light emitting element and a light receiving element disposed on opposing inner surfaces and configured to spatially propagate an optical signal from the light emitting element to the light receiving element. And a light path converting element such as a hologram for converting an optical path of an optical signal emitted from the light emitting element in the direction of the light receiving element is provided between the two elements. An optical package, characterized in that: