JPH03160408A - Optical module and light transmission device - Google Patents

Abstract

PURPOSE:To allow the reception of plural light signals even if the same photoelectric converter for signal reception is used by switchably providing plural optical filters between an optical fiber and an optical semiconductor element. CONSTITUTION:A slit 10 is formed in a part of a housing 3 and a slide plate 12 fixed with two sheets of the optical filters 11a, 11b is freely movably mounted therein. The slide plate 12 has knob parts 13 on both sides and allows the easy switching of the optical filters 11a, 11b when the knobs 13 are operated at the time of the movement of the slide plate 12. The reception of the plural light signals with one piece of the photoelectric converter is possible in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical module in which a plurality of optical filters can be switched between an optical fiber and an optical semiconductor element, and an optical transmission device using the same.

2. Description of the Related Art In recent years, communication devices using optical fibers have been adopted in various fields due to their characteristics of broadband and long distance.

In particular, wavelength division multiplexing transmission equipment that utilizes differences in wavelengths of light is
It is the best way to use Hikari 7y IPA effectively,
Various optical modules for this purpose have been considered.

Below, an optical module used in a conventional wavelength division multiplexing transmission device and an optical transmission device using the same will be explained.

FIG. 6 shows the structure of an optical module used in a conventional wavelength division multiplexing transmission device. In FIG. 6, reference numeral 1 denotes an optical connector incorporating an optical fiber 2. As shown in FIG. A housing 3 is fitted with the optical connector 1 with high precision, and is fixed to the member 6 with an adhesive 7 so that the convergent rond lens 4 and the light receiving element 6 are optimally connected at opposing positions. The convergent rod lens 4 has a bandpass filter 8 deposited on its end face, which allows only light of a specific wavelength to pass through.

FIG. 7 shows a wavelength division multiplexing transmission device using the above optical module. In FIG. 7, 20 is a transmitting photoelectric converter that transmits an optical signal with a wavelength of 1.3 μm, and 21 is a transmitting photoelectric converter with a wavelength of 1.65 μm.
This is a transmission photoelectric converter that transmits optical signals. 22 is an optical multiplexer that multiplexes the lights of both wavelengths, 23 is an optical fiber that transmits the multiplexed light, and 24 is an optical demultiplexer that separates the multiplexed light.

25 is a receiving photoelectric converter that receives only an optical signal with a wavelength of 1.3 μm, and 26 is a receiving photoelectric converter that receives only an optical signal with a wavelength of 156 μm. Photoelectric conversion fi2s for reception,
Each optical module 27.2e has an optical filter 8 that allows only light of a specific wavelength to pass through, as shown in FIG.
28 is attached.

Problems to be Solved by the Invention However, the conventional structure described above is used when receiving an optical signal of a specific wavelength and photoelectrically converting it, and is used only to improve the degree of separation from light of other wavelengths. An optical filter was used. That is, there was a problem in that a plurality of optical signals could not be received using the same receiving photoelectric converter.

The present invention solves the above conventional problems, and provides an optical module that can receive signals using the same receiving photoelectric converter by switching optical filters according to the wavelength of the received optical signal. This is the purpose.

Means for Solving the Problem In order to solve this problem, the optical module of the present invention has a structure in which light of a plurality of wavelengths within the sensitivity range of the light receiving element can be selectively extracted between the optical fiber and the optical semiconductor element. , has a structure in which a plurality of optical filters are arranged to be switched.

Depending on the structure and action, light of a desired wavelength can be selected from among the wavelengths of a plurality of incident optical signals.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2 show the structure of an optical module in a first embodiment of the present invention. 3 in the figure, 1 is an optical connector with a built-in optical fiber 2, 3 is a housing for accurately fitting the optical connector 1;
A light receiving element 6 having a light receiving surface 6& for receiving all the emitted light is provided at a position facing the eyeper 2. In addition, a slit 10 is formed in a part of the housing 3, and a slide plate 1 has two optical filters 111L and 1lb fixed thereto.
2 is movably attached. The slide plate 12 has knobs 13 on both sides, and by operating the knobs 13 when moving the slide plate 12, it is possible to easily switch between the optical filters 11 & , 1lb. Become.

As described above, according to this embodiment, by providing the two optical filters 11a and 11b switchably between the optical fiber 2 and the light receiving element 5, it is possible to select optical signals having two different wavelengths. Can be done.

A second embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a structural diagram of an optical transmission device showing a second embodiment of the present invention. In the same figure, 20 is the wavelength 13
A transmitting photoelectric converter 21 transmits light with a wavelength of 1.0 μm.
A photoelectric converter for transmission that transmits light of 55 μm, 22 a multiplexer that multiplexes light of both wavelengths, 23 an optical fiber for transmission, and 29 an optical module having a structure similar to that shown in FIG. This is a photoelectric converter for reception. The light receiving element 6 used in the optical module will be explained using Fig. 1 in Reference 1.
is an InGaP element that can receive light with a wavelength of 13 μm and a wavelength of 1.56 μm, and the optical filters 11a and 11b are:
These are bandpass filters made of dielectric multilayer films that allow only wavelengths of 13 μm and 1.55 μl to pass, respectively.

The operation of the optical transmission device constructed as described above will be explained below with reference to FIG. Wavelength 13μm and wavelength 1
．． The 55 μm transmitting photoelectric converters 20 and 21 are always transmitting 9, and the optical filter 11a is installed on the receiving photoelectric converter 29 side.
, 1lb is selected.

As described above, multiple optical filters are cut on the receiving side for signals with different wavelengths sent from the transmitting side.
By arranging them interchangeably, one reception photoelectric converter can receive optical signals of a plurality of wavelengths. Therefore, all the signals on the transmitting side can be controlled by 11 of the same = i transmission method, and 1
This makes it possible to create an optical transmission device that can receive many signals at different receiving ends.

Note that in the second embodiment, the optical filters 1 1 1L,
Although 11b is a band pass filter, it is not mentioned that it may be used as a short wavelength band pass filter or a long wavelength band pass filter, respectively.

FIGS. 4 and 6 show a third embodiment of the present invention. In FIGS. 4 and 6, the same parts as those shown in FIGS. 1 to 3 are designated by the same numbers. The explanation will be omitted.

Click on Figure 4 and press 30. 31 is a permanent magnet attached to the slide plate 12. 32.33 is housing 3
An electromagnet attached to the magnet is attracted to and repulsed by the permanent magnets 30 and 31.

Next, an optical transmission device constructed using the optical module shown in FIG. 4 will be described with reference to FIG. 6. In this embodiment, a case will be considered in which a plurality of channels such as OATV are transmitted using two wavelengths. Illustrated housing, 1~ for light with a wavelength of 13 μm
Converts 40 channels of signals into 4 channels of light with a wavelength of 155 μm.
When the signals of channels 1 to 80 are sent by the transmitting photoelectric converters 20 and 21, and the signal of the channel is selected on the receiving side, the control circuit 40 determines whether the wavelength of the light is 13 μm or 165 μm. The fourth
A current is applied to the electromagnets 32, 33 shown in the figure.

At this time, the electromagnet 32. 33, the polarity of the magnetic pole is reversed in response to wavelength selection.

In this way, it is possible to realize an optical transmission device that automatically switches the optical filter for the wavelength on the transmitting side by determining the selection signal.

Effects of the Invention As described above, the present invention provides a plurality of optical filters that can be switched between an optical fiber and an optical semiconductor element, thereby making it possible to receive a plurality of optical signals with one photoelectric converter. This makes it possible to realize an excellent optical module.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an optical module according to a first embodiment of the present invention, FIG. 2 is a cross-sectional view of the same optical module after operation, and FIG. 3 is an optical transmission diagram according to a second embodiment of the present invention. 4 is a sectional view of an optical module according to the third embodiment of the present invention, FIG. 6 is a sectional view of an optical transmission device using the same optical module, and FIG. FIG. 7, which is a cross-sectional view of an optical module, is a structural diagram of an optical transmission device using a conventional optical module. 1... Optical connector, 2... Optical fiber, 6... Light receiving element, 11sL, 1lb...
...Optical filter.

Claims (3)

[Claims] (1) An optical module in which a plurality of optical filters are switchably provided between an optical fiber and an optical semiconductor element. (2) An optical transmission device using light of a plurality of wavelengths and having the optical module according to claim 1 disposed on the receiving side. (3) The optical transmission device according to claim 2, further comprising means for detecting an optical filter selection signal on the receiving side, and means for moving the optical filter in accordance with the selection signal.