JPS60103835A - System for constituting optical switch - Google Patents

Abstract

PURPOSE:To eliminate the need for many switches for connection between incoming and outgoing lines and changing path of light by assigning wavelength corresponding to each outgoing line without assembling any physical switch matrix and converting the wavelength of an optical signal from the incoming line into the wavelength of an outgoing line. CONSTITUTION:Each optical signal given from input terminals 11-1n is converted into the wavelength corresponding to the outgoing line by wavelength converting circuits 31-3n, subject to wavelength multiplex by a synthesizer 4 and propagated on a wavelength multiplex transmission line 6. The optical signal subject to wavelength multiplex is branched (wavelengths lambda21-lambda22) by a branching filter 5 and given to outgoing lines 21-2n. Thus, an optical switch connecting specific incoming and outgoing lines is realized by wavelength conversion, wavelength multiplex and branching. A filter 8i transmits only a light having an optional wavelength in the light of the broad wavelength region by using a control input from 9i. As a result, the wavelength of the input light 1i is converted and extracted from 10i as an output light.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a configuration method of an optical switch that performs a specific connection ftjL between an incoming line and an outgoing line in optical communication.

(Background Art) Conventionally, this type of system δ has a switch matrix constructed in order to output light from a specific incoming line to a specific outgoing line, and at the intersection of the switches, optical fibers, prisms, etc. are moved mechanically, and electro-optic effects are used. This was achieved by changing the path of the light by changing the coupling ratio of the directional coupler using The drawback was that the entire matrix was expensive.

(Section 1/fi of the invention) In order to solve these drawbacks, the present invention constructs a physical switch matrix, assigns a wavelength to each outgoing line, and
By converting the wavelength of the incoming optical signal to the wavelength of the outgoing line, the connection between the incoming line and the outgoing line is established, and there is no need to use a large number of switches to change the path of the light. The drawings will be explained in detail below.

(Structure and operation of the invention) FIG. 1 shows an embodiment of the invention, and 11. +2. -I
n is an optical input terminal, 2+, 22. ---2n is optical output,
31゜32,---3n is a wavelength conversion circuit, 4 is a multiplexer,
5 is a demultiplexer 6 is a wavelength multiplexing transmission line, input, 1. Input, 2-7rL are wavelengths corresponding to each outgoing line. Input terminal 11
Each optical signal input from ~1n is converted into a wavelength corresponding to the outgoing line by wavelength conversion circuits 31~3n, multiplexed by the multiplexer 4, and propagated on the wavelength multiplex transmission path d.

# The optical signal that has been used for a long time is demultiplexed by the demultiplexer 5 (wavelength input, 1~
1) and go out to each output line 2I to 2n. Therefore, an optical switch that connects special incoming lines and outgoing lines can be realized by wavelength conversion, multiple wavelength use, and demultiplexing.

The '4' IJZ diagram is an example of the configuration of the wavelength conversion circuit (31) at number 1 [-1 in FIG. 1. +1 is an optical input terminal, 7L is a medium that has a nonlinear optical effect such as stimulated Raman 119 disturbance effect, 8 l is a filter that transmits the wavelength of arbitrary, a, 8
1 is a terminal for controlling the transmission wavelength of the filter, iot is an output terminal, and Ili is an intermediate terminal. Due to the nonlinear optical phenomenon of 71, the light of a certain wavelength input from the first branch becomes light of a wide wavelength range at the intermediate terminal 11i after passing through 71. The filter 81 transmits only light of an arbitrary wavelength within this wide wavelength range under the control of the filter 91. As a result, the wavelength of the input light of 1 jujube can be converted and extracted as output light from 10i. The 7L phenomenon can be realized by a Raman fiber that eliminates the stimulated Raman scattering effect. In addition, the 8l filter is an optical waveguide directional coupling filter (R, C, Alferness, etc.) Tunab
le optical wave-guide dir
ectional coupler filter”)
Applphys, Left, 33181 (19
78) ) It can be realized from 'f-d.

(Effects of the invention) As explained below-1, by using wavelength conversion, wavelength multiple use, demultiplexing, and multiplexing technology, the switch matrix can be equivalent to that without configuring a switch matrix using an optical switch that changes the path of light. It has the advantage of being able to configure a switch that is

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing an example of realizing a wavelength conversion circuit. 11, 12. ---11. --- in: optical signal input terminal, 21, 22. ---2i, ---2n: Light also No. 11 output terminal r-131, 32. ---3i, ---
3n: wavelength conversion circuit, 4: multiplexer, 5: demultiplexer, 6: multi-wavelength transmission line, 71 Niraman fiber. 8”: Fabry-Perot resonator. 91: Refraction - (A = change medium, 10i: output of wavelength conversion circuit, 11 length: refractive index change controller) Agent jr Riju Sansui, +lj - Figure 1 =,, -3i kar---, L - 1 1 ■

Claims (1)

[Claims] In an optical switch that selectively connects multiple incoming lines and multiple outgoing lines, a different wavelength is assigned to each outgoing line, and a wavelength conversion circuit is provided for each incoming line to connect the output to which human-powered light should be connected. An optical switch configuration characterized in that, after converting to the wavelength of the line, the optical switch performs a switching operation by combining the output light with the output light from a wavelength conversion circuit corresponding to other input lines and further demultiplexing the wavelength of each output line 11j. method.