JPH0469023A - Optical power supply device - Google Patents

Abstract

PURPOSE:To obtain an optical power supply deuce having simple constitution and producing a sufficiently high output voltage with high conversion efficiency by diving two E/O converters having different light emission wavelength in reverse phase, combining light flux emitted respectively therefrom, incidenting light flux of two wavelengths to two O/E converters and then boosting and rectifying the flux. CONSTITUTION:Flux emitted, respectively, from two E/O converters 1a, 1b comprising LDs of different wavelength is combined through a multiplexer 10 thence transmitted on an optical fiber 2 and emitted from an emission edge 2b. Emitted flux 3 is subjected to wavelength selection through a demultiplexer 11 so that flux having wavelength lambdaa is incident to an O/E converter 4a whereas flux having wavelength lambdab is reflected to an O/E converter 4b. Each output is boosted according to the turn ratio and rectified through a rectifying circuit 13 into a DC voltage which is then fed to a sensor 5. Since the O/E converters 4a, 4b have light receiving area wider than the divergence of flux 3, conversion efficiency is improved.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an optical power supply device that supplies power necessary for operating a sensor or the like using optical energy through an optical fiber.

[Conventional technology]

Figure 3 is a configuration diagram showing a conventional optical power supply device that supplies the power necessary for the operation of sensors etc. using optical energy. (hereinafter referred to as the E10 converter), 2 is an optical fiber that transmits the optical energy generated by the E10 converter 1 by inputting it from the input end 2a,
3 is a light beam transmitted by the optical fiber 2 and diverged from its output end 2b, 4a, 4b...4x is a light-electric power source such as a solar cell that receives the light beam 3 and generates electrical energy proportional to its energy intensity. A converter (hereinafter referred to as an O/E converter) 5 is a sensor that operates upon receiving electrical energy generated by the O/E converters 4a to 4x. Next, the operation will be explained. The E10 converter 1 uses a light emitting element such as a semiconductor laser (hereinafter abbreviated as LD), and generates a light beam having light energy (light intensity, light amount) proportional to input electrical energy. This light flux enters the input end 2a of the optical fiber 2, which is a light transmission path, is transmitted to a sensor section installed at a remote location, and is directed from the output end 2b toward the 0/E converters 4a to 4X. radiated as. O/E
The converters 4a to 4X use light receiving elements such as solar cells (hereinafter abbreviated as SB), and generate electrical energy (power) proportional to incident light energy. By supplying this electrical energy to the sensor 5, the sensor 5 performs a predetermined operation.

[Issue 8 to be solved by the invention] Since the conventional optical power feeding device is configured as described above,
An LD is normally used in the E10 converter 1 because it generates a large amount of light energy and has a high efficiency of incidence into the optical fiber 2, but the output light beam 3 from the optical fiber 2 is not uniform due to the influence of diffraction effects. On the other hand, O/E converters 4a to 4χ
Generally, an SB is used for this purpose, but since the SB output voltage is lower than the driving voltage of the sensor 5, a plurality of SBs are connected in series as shown in the figure. Therefore, due to the non-uniformity of the emitted light flux 3, each S
A difference occurs in the light energy incident on B, and non-uniformity remains in the electrical energy after conversion. Furthermore, since the SBs are connected in series, the total output is limited by the SB with the minimum ordered energy, resulting in an extremely inefficient optical power supply device. The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain an optical power feeding device with a simple configuration and high conversion efficiency.

[Means to solve the problem]

The optical power supply device according to the invention of claim 1 has two different emission wavelengths.
E10 converters are driven in opposite phases, their respective emitted light beams are combined by a multiplexer, and then demultiplexed by a demultiplexer for each wavelength. The output voltage of the 0/E converter is boosted and rectified by inputting the 0/E converter to the 0/E converter. The optical power feeding device according to the invention of claim 2 uses a light emitting element that generates a light beam with a constant polarization angle, passes and reflects the emitted light beam with a splitter, and divides the passed light beam and the reflected light beam into the first and second beams. into the second O/E converter, and this O/E
This is designed to boost and rectify the output voltage of the converter.

[For use]

In the optical power feeding device according to the invention of claims 1 and 2, light is separately incident on the two O/E converters, the light receiving area is large enough to exceed the spread of the luminous flux, and the conversion efficiency is improved.
Furthermore, a sufficiently high output voltage can be obtained.

【Example】

An embodiment of the invention according to claim 1 will be described below with reference to the drawings. In FIG. 1, a first...
2nd E10 converter, 14 is a pulse voltage that drives the 1° second E10 converter 1a, lb in opposite phase; 2 is an optical fiber; 3 is a luminous flux emitted from the optical fiber 2; 4a, 4;
b is the first. a second O/E converter, 5 a sensor, 1o a first . A multiplexer 11 combines the light beams emitted from the second E10 converters 1a and lb and sends them to the optical fiber 2. A multiplexer 11 selects the light beam 3 emitted from the optical fiber 2 according to the wavelength, and selects the light beam 3 emitted from the optical fiber 2, The second E10
12 is a first branching filter that emits the light beam from the converter 1b;
．． A transformer 13 serves as a step-up means for boosting the output of the second O/E converter 4a+4b, and a rectifier circuit 13 rectifies the pulse voltage from the transformer 12, converts it into DC power, and supplies it to the sensor 5. Next, the operation will be explained. 1st. The second E10 converters 1a, Ib are composed of LDs with different wavelengths (λa, λb), and are turned on by a pulse voltage 14 as shown in FIG. In ten regions of the waveform of the pulse voltage 14, the second E10 converter 1b lights up and -
In the region, the first E10 converter 1a lights up. These 2
The light beams generated by the E10 converters la and lb are combined by a multiplexer 10, transmitted through an optical fiber 2, and then emitted from an output end 2b. Emitted light flux 3
is wavelength-selected by the demultiplexer 11, the light beam with wavelength λa passes through and enters the first O/E converter 4a, and the light beam with wavelength λb is reflected and enters the second O/E converter 4b. do. Each 0
The /E converters 4a and 4b are connected to the input side of the transformer 12 in opposite directions, and each output is boosted with a turns ratio and then supplied to the sensor 5 as a DC voltage by the rectifier circuit 13. In this process, two O/E converters 4a
, 4b each have a sufficient light-receiving area that is larger than the spread of the light beam 3, so that the non-uniformity of the light beam 3 becomes irrelevant, and the conversion efficiency is improved. FIG. 2 shows an embodiment according to the invention of claim 2. In Fig. 2, 1 is a light emitting element consisting of a linearly polarized LD, 2 is a polarization-maintaining optical fiber, and 11 is a light beam that is transmitted through the optical fiber 2 and is reflected or passed depending on the polarization angle. Duplexer 20 is a motor, duplexer 11
Rotate. Note that the configuration of other parts is the same as that in FIG. 1, so description thereof will be omitted. Next, the operation will be explained. The light beam with a constant polarization angle emitted by the light emitting element 1 is transmitted to the incident end 2.
The light enters from the optical fiber 2, is transmitted while maintaining its polarization plane, and is emitted from the output end 2b to the demultiplexer 11. The demultiplexer 11 is rotated by a motor 20, and this rotation causes the light flux to pass through and reflect alternately. Duplexer 1
The luminous flux passing through jW through 1 is incident on the first O/E converter 4a, and the luminous flux reflected from the demultiplexer 11 is incident on the second O/E converter 4a.
b. As a result, the first. The amount of light incident on the second O/E converter 4a4b changes, and the amount of light incident on the first O/E converter 4a4b changes. Second 0/E converter 4a, 4
An alternating current signal is output from b. This alternating current signal is boosted and rectified in the same manner as in the embodiment shown in FIG. 1, and then supplied to the sensor 5.

【Effect of the invention】

As described above, the optical power supply device according to the invention of claim 1 drives two E10 converters with different emission wavelengths in opposite phases, combines the respective emission beams with a multiplexer, and then separates the emission beams according to wavelength. A demultiplexer demultiplexes the two wavelengths of light into two O
The output of the O/E converter was configured to be input to the respective O/E converters, and the output of the O/E converter was boosted and rectified. Further, the optical power feeding device according to the invention of claim 2 uses a light emitting element that generates a light beam with a constant polarization angle, passes and reflects the emitted light beam with a splitter, and divides the passed light beam and the reflected light beam into a second beam. The configuration was such that the light was input to the first and second O/E converters, and the output of the O/E converters was boosted and rectified. Therefore, according to the invention of claims 1 and 2, two O/E
Light is incident on the converter separately, the light receiving area is large enough to exceed the spread of the luminous flux, and the effect is that it is possible to obtain an optical power feeding device with high conversion efficiency and a sufficiently large 8 voltage with a simple configuration. It will be done.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram showing an optical power feeding device according to an embodiment of the invention of claim 1, FIG. 2 is a configuration diagram showing an optical power feeding device according to an embodiment of the invention of claim 2, and FIG. FIG. 2 is a configuration diagram showing an optical power supply device. In the figure, la and Ib are E10 converters, 1 is a light emitting element, 4a and 4b are O/E converters, 10 is a multiplexer, 11 is a duplexer, 12 is a transformer, and 13 is a rectifier circuit. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 6-1

Claims (2)

[Claims] (1) first and second electro-optical converters that are driven in opposite phases and have different emission wavelengths;
a multiplexer that combines the light beams generated from the electro-optical converter; a demultiplexer that demultiplexes the combined light beam obtained from the multiplexer into wavelengths; A first optical-to-electrical converter that receives a luminous flux of the emission wavelength of the first electrical-to-optical converter among the luminous fluxes of different wavelengths and generates electrical energy according to the amount of the incident light, and a branching filter. a second optical-to-electrical converter that generates electrical energy in accordance with the amount of incident light upon which a luminous flux having the emission wavelength of the second electrical-to-optical converter is incident on the obtained luminous fluxes of different wavelengths; and a photovoltaic power supply device comprising: a booster for boosting the output voltage of the second opto-electrical converter; and a rectifier circuit for rectifying the output voltage of the booster. (2) A light emitting element that generates a luminous flux with a constant polarization angle, a splitter that alternately passes and reflects the luminous flux from the light emitting element, and the luminous flux that has passed through the splitter is incident, and the light flux is adjusted according to the amount of incident light. a first optical-to-electrical converter that generates electrical energy, a second optical-to-electrical converter that receives the light beam reflected by the splitter and generates electrical energy according to the amount of incident light; An optical power supply device comprising boosting means for boosting the output voltages of first and second opto-electrical converters, and a rectifier circuit for rectifying the output voltage of the boosting means.