KR100470869B1 - Apparatus for converting wavelength of optical signal - Google Patents

Abstract

The present invention relates to an optical wavelength conversion device, wherein the optical wavelength conversion device of the present invention includes a Fabry-Perot semiconductor laser diode (10), and the optical input terminal 11 has an optical signal (A1) having a wavelength? 1 having data. Is provided, and the optical input terminal 12 is provided with an optical signal B1 of wavelength lambda 2 having a constant light level. The optical signals A1 and B1 are provided to the Fabry-Perot semiconductor laser diode 10 via the phase adjusters 13 and 14, the combiner 15 and the circulator 16, and the Fabry-Perot semiconductor laser diode 10 ) Outputs optical signals A2 and B2 of wavelengths λ1 and λ2, wherein optical signal A2 has the same wavelength λ1 and data logic as optical signal A1, and optical signal B2 is optical It has the same wavelength lambda 2 as the signal B1 and has inverted data logic in the data logic of the optical signal A1. In the present invention, the optical signals A2 and B2 provided from the circulator 16 are filtered by the filter 17 to provide only the optical signal B2 to the optical output terminal 18.

Therefore, the present invention has an effect that it is possible to simply convert the wavelength of the optical signal using a low-cost Fabry-Perot semiconductor laser diode.

Description

Optical wavelength conversion device {APPARATUS FOR CONVERTING WAVELENGTH OF OPTICAL SIGNAL}

TECHNICAL FIELD The present invention relates to an optical wavelength converter, and more particularly, to an optical wavelength converter for changing an optical wavelength using a Fabry-Perot semiconductor laser diode.

Convert high-speed optical signals into electrical signals to meet the demands of high capacity communications All-optical networks that process at the optical signal level using wavelength division multiplexing techniques without switching are widely used. In all-optical networks based on such wavelength division multiplexing, optical wavelength conversion technology is indispensable as networks become more complex.

In order to convert the optical wavelength, two optical signals having different wavelengths are injected into the semiconductor laser amplifier, and the optical wavelength is converted by using the cross gain modulation, the cross phase modulation, and the four-wave mixing phenomenon generated in the semiconductor laser amplifier. It is proposed and used.

However, the above-described optical wavelength conversion method has a disadvantage of using an expensive semiconductor laser amplifier.

In order to solve these disadvantages, a method of using a cross-phase modulation or a four-wave mixing phenomenon, which occurs when an optical fiber is used instead of a semiconductor laser amplifier and two optical signals having different wavelengths is applied to the optical fiber, has been proposed. The disadvantage is that it must be low and have a long optical fiber.

SUMMARY OF THE INVENTION The present invention has been made to solve this problem, and an object of the present invention is to provide an optical wavelength converter that converts an optical wavelength using a low-cost Fabry-Parrot semiconductor laser diode.

In order to achieve the above object, the present invention provides an optical wavelength conversion apparatus.

Fabry-Perot semiconductor laser diode; Receiving a first optical signal having a wavelength corresponding to one of a plurality of oscillation wavelengths of a Fabry-Perot semiconductor laser diode A first input terminal; A second input terminal for inputting a second optical signal having a constant power and a wavelength other than the wavelength of the first optical signal among the oscillation wavelengths of the Fabry-Perot semiconductor laser diode; First and second phase adjusters for matching the phases of the first and second optical signals of the first and second input terminals with the phase of the oscillation wavelength of the Fabry-Perot semiconductor laser diode; A combiner for adding the first and second optical signals phase adjusted to the first and second phase adjusters; A filter for filtering only a signal corresponding to a wavelength of the second optical signal and providing the same to an optical output terminal; And a circulator for providing an output of the combiner to the Fabry-Perot semiconductor laser diode and providing an optical signal output from the Fabry-Perot semiconductor laser diode to the filter.

Hereinafter, the present invention will be described in detail.

1 is a block diagram of an optical wavelength converter according to the present invention. As shown, the present invention includes a Fabry-Perot semiconductor laser diode 10 and is implemented by using the characteristics of the Fabry-Perot semiconductor laser diode 10. do. The Fabry-Perot semiconductor laser diode 10 has the characteristic of having an oscillation mode for several wavelengths as shown in FIG. 2A, but for example, the Fabry-Perot semiconductor laser diode 10 of FIG. 2B or FIG. When the external light of the same wavelengths λ1 and λ2 is provided among the oscillation wavelengths, the oscillation mode of a wavelength not corresponding to the external light is suppressed, and only the wavelengths λ1 and λ2 are output as shown in FIG. 2D. Wavelengths other than the wavelengths λ1 and λ2 are also output, but their size is negligible.)

 The present invention utilizes this property of the Fabry-Perot semiconductor laser diode 10, which will be described in detail below.

First, the present invention includes two optical input terminals 11 and 12, and the optical input terminal 11 includes, for example, light representing data by the oscillation wavelength λ1 of the Fabry-Perot semiconductor laser diode 10. Signal A1 is provided. The present invention is for converting the wavelength [lambda] 1 of the optical signal A1, which is data, into any other wavelength (e.g., [lambda] 2: one of the oscillation wavelengths of the Fabry-Perot semiconductor laser diode 10). Provides an optical signal B1 having a wavelength λ2 having a constant intensity to the optical input terminal 12, and converts the phases of the optical signals A1 and B1 through the phase adjusters 13 and 14 to a Fabry-Perot semiconductor laser. Adjust to have the same phase as the oscillation signal of the diode 10.

The optical signals A1 and B1 whose phases are adjusted in the phase adjusters 13 and 14 are combined in the optical combiner 15 and then provided to the Fabry-Perot semiconductor laser diode 10 through a circulator 16. do. As described above, the Fabry-Perot semiconductor laser diode 10 survives only the oscillation modes of the wavelengths λ1 and λ2 corresponding to the wavelengths λ1 and λ2 of the optical signals A1 and B1 among the oscillation modes of the multiple wavelengths. Since the inconsistent oscillation mode is suppressed, optical signals A2 and B2 having wavelengths λ1 and λ2 as shown in FIG. 2D are output.

At this time, the optical signal A2 of the wavelength λ1 output from the Fabry-Perot semiconductor laser diode 10 has logic corresponding to the data logic of the optical signal A1, but the optical signal B2 of the wavelength λ2. ) Will have logic opposite to the data logic of optical signal A1. will be. That is, since the total output power of the Fabry-Perot semiconductor laser diode 10 is constant, the optical signal A2 has a large gain when the optical signal A1 is logic 1, but the gain of the optical signal B2 becomes small. When the optical signal A1 is at logic 0, the gain of the optical signal A2 becomes small, but on the contrary, the gain of the optical signal B2 becomes large. That is, the optical signal B2 output from the Fabry-Perot semiconductor laser diode 10 has data logic opposite to the input optical signal A1.

Here, the optical signal B2 output from the Fabry-Perot semiconductor laser diode 10 has logic opposite to the data logic of the input optical signal A1 and is different from the wavelength λ1 of the optical signal A1. It has a wavelength λ2. That is, the optical signal B2 has the same data as the optical signal A1 (of course, the data logic is reversed, but it can be easily restored to the original logic by inverting it with an inverter), but only the wavelength from λ1 to λ2. You can see that it has changed.

The optical signals A2 and B2 of the Fabry-Perot semiconductor laser diode 10 are provided to the bandpass filter 17 through the circulator 16, and the bandpass filter 17 is an optical signal having a wavelength? 2. Only B2) is passed through and provided to the light output terminal 18. That is, the optical output terminal 18 is provided with the optical signal B2 whose wavelength is changed only from λ1 to λ2 while maintaining the data logic of the optical signal A1 (substantially inverted logic).

As described above, in the present invention, the wavelength of the optical signal can be easily converted using a low-cost Fabry-Perot semiconductor laser diode.

1 is a block diagram of an optical wavelength conversion device according to the present invention;

2 is a view for explaining a wavelength conversion state in the optical wavelength conversion device according to the present invention.

<Description of the symbols for the main parts of the drawings>

11, 12: optical input terminal 13, 14: phase adjuster

15: combiner 16: circulator

17: band pass filter 18: optical output terminal

10: Fabry-Perot semiconductor laser diode

Claims (1)

In the optical wavelength conversion device, Fabry-Perot semiconductor laser diode; A first input terminal for inputting a first optical signal having a wavelength corresponding to one of a plurality of oscillation wavelengths of the Fabry-Perot semiconductor laser diode; A second input terminal configured to input a second optical signal having a constant power and a wavelength other than the wavelength of the first optical signal among the oscillation wavelengths of the Fabry-Perot semiconductor laser diode; First and second phase adjusters for matching phases of the first and second optical signals of the first and second input terminals with phases of the oscillation signal of the Fabry-Perot semiconductor laser diode; A combiner for adding the first and second optical signals phase adjusted to the first and second phase adjusters; A filter for passing only a signal corresponding to a wavelength of the second optical signal to provide to an optical output terminal; And a circulator for providing an output of the combiner to the Fabry-Perot semiconductor laser diode and providing an optical signal output from the Fabry-Perot semiconductor laser diode to the filter.