TWI454768B - Light removal device and light extraction method - Google Patents

Description

Light extraction device and light extraction method

The present invention relates to an apparatus and method, and more particularly to a light extraction apparatus and a light extraction method.

The increase in the amount of transmission required for the Internet and information traffic has led to an increase in the size of the optical network, which has increased the demand for active and passive components (such as optical switches, optical switches, etc.) for optical fiber communication.

The Republic of China new patent 516641 proposes a conventional optical switcher based on a micro-optical electromechanical system, which uses multiple rotatable micro-double mirrors (not shown) to achieve the effect of light switching, for example, the micro-double mirrors are erected On the controllable rotary motor (not shown), the direction of the input optical signal is changed by using the mutual rotation directions of the micro double-sided mirrors to quickly exchange optical signals, thereby forming a plurality of optical switches, and the micro-duplex The mirror changes the direction of the optical signal by the rotation of the micro-mirror center normal line, and simultaneously performs multiple sets of optical signal exchanges under the micromirror surface, and has multiple input and multiple output functions.

A disadvantage of this conventional optical switcher is that the use of a micro-double mirror will increase the complexity of the design.

Accordingly, it is an object of the present invention to provide a light extraction device that reduces design complexity.

The light extraction device includes: a dual light generating unit adapted to receive an input optical signal and a control signal, and generate first and second optical signals whose phase difference is related to the control signal according to the input optical signal; and The first-order Bragg grating includes a first end receiving the first optical signal and a second end receiving the second optical signal, and causing optical interference in a predetermined wavelength range, and respectively from the first The second end outputs the first and second optical output signals.

A second object of the present invention is to provide a light extraction method.

The light extraction method comprises the following steps:

(a) providing a light extraction device comprising a dual light generating unit and a first order Bragg grating, the dual light generating unit operable to receive an input light signal and a control signal, and based on the input light The signal produces first and second optical signals having a phase difference associated with the control signal, the first order Bragg grating having a first end and a second end operable to receive the first optical signal from the first end and Receiving the second optical signal from the second end, and causing optical interference in a predetermined wavelength range, and outputting the first and second optical output signals from the first end and the second end, respectively;

(b) supplying the input optical signal to the dual light generating unit, the input optical signal being substantially coherent and having a wavelength falling within the predetermined wavelength range;

(c) supplying the control signal to the dual light generating unit, the control signal having a state sufficient for the first and second optical signals output by the first order Bragg grating to be respectively preset in the first and second Level.

A third object of the invention is to provide another method of light extraction.

The light extraction method comprises the following steps:

(a) providing a light extraction device comprising a dual light generating unit and a first order Bragg grating, the dual light generating unit operable to receive an input light signal and a control signal, and based on the input light The signal produces first and second optical signals having a phase difference associated with the control signal, the first order Bragg grating having a first end and a second end operable to receive the first optical signal from the first end and Receiving the second optical signal from the second end, and causing optical interference in a predetermined wavelength range, and outputting the first and second optical output signals from the first end and the second end, respectively;

(b) providing the input optical signal to the dual light generating unit, the input optical signal being substantially coherent and having a wavelength falling within the predetermined wavelength range;

(c) providing the control signal to the dual light generating unit, the control signal having a first state sufficient to cause the first and second optical signals output by the first order Bragg grating to be substantially maximum and substantially Minimum; and

(d) adjusting the control signal to a second state, the power of the first and second optical signals output by the first-order Bragg grating being substantially minimum and substantially maximum, respectively.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of FIG.

<Light extraction device>

As shown in FIG. 1, a preferred embodiment of the light extraction device 10 of the present invention comprises: a dual light generating unit 8, and a first order Bragg grating 9.

The dual light generating unit 8 is adapted to receive an input optical signal and a control signal, and generate first and second optical signals whose phase difference is related to the control signal according to the input optical signal.

The first-order Bragg grating 9 includes a first end receiving the first optical signal and a second end receiving the second optical signal, and causing optical interference in a predetermined wavelength range, and respectively from the first The second end outputs the first and second optical output signals.

In the present embodiment, the first-order Bragg grating 9 is a first-order Bragg fiber grating (FBG) formed in the core of the optical fiber, and is widely used in many device components in the field of optical communication. .

The physical property of the first-order Bragg grating 9 is that when the wavelength of the input light satisfies the first-order Bragg condition Λ=π/β, the input light generates a reflected light and a transmitted light due to resonance coupling, wherein In the grating period, β is a propagation constant. Therefore, in the case where the two ends of the first-order Bragg grating 9 have input light, the light propagating from the first end to the second end and the light propagating from the second end to the first end Light will interfere. The predetermined wavelength range is determined by the first order Bragg condition.

The dual light generating unit 8 includes an optical splitter 81, an optical phase adjuster 82, and two optical circulators 83, 84.

The optical splitter 81 has an input end and a second output end. The optical splitter 81 is adapted to receive the input optical signal from the input end, and divide the input optical signal into two optical signals having substantially the same power to respectively The two outputs are output. In the present embodiment, the optical splitter 81 is a -3 dB coupler.

The optical phase adjuster 82 has an input end coupled to one of the output ends of the optical splitter 81, an output end, and a control end, and the optical phase adjuster 82 is adapted to receive the control signal from the control end, and according to the The control signal adjusts the phase of the optical signal received from the input to output from the output. In the present embodiment, the optical phase adjuster 82 is a fiber phase shifter, and the control signal is a voltage signal.

The optical switch 83 has a first end coupled to the output end of the optical phase adjuster 82, a second end outputting the first optical signal and receiving the first optical output signal, and a third end. The other optical switch 84 has a first end coupled to the other output end of the optical splitter 81, a second end outputting the second optical signal and receiving the second optical output signal, and a third end . Each optical circulator 83, 84 outputs an optical signal received from the first end from the second end, and an optical signal received from the second end is output from the third end. Therefore, the first optical output signal is outputted by the third end of the optical circulator 83, and the second optical output signal is output by the third end of the optical circulator 84.

<Experimental results>

As shown in FIGS. 1 and 2, the resonant wavelength of the first-order Bragg grating 9 is 1543.39 nm, and the input optical signal is coherent, has a wavelength of 1545.48 nm, and has a power of 6 dBm (about 3.891 mW). When the voltage of the control signal changes, the power of the first and second optical output signals also changes. When the voltage of the control signal is =0V, the power of the first optical output signal=0.52675mW and the power of the second optical output signal=2.35802mW, indicating that the optical signal is mainly outputted by the third end of the optical circulator 84, but when increased When the voltage of the signal is controlled, the power of the first optical output signal gradually increases, and the power of the second optical output signal gradually decreases, and when the voltage of the control signal is=15.9 V, the power of the first optical output signal = 2.33744 mW and the second The power of the optical output signal = 0.559967 mW, and it has been shown that the optical signal is mainly outputted from the third end of the optical circulator 83, and a DC voltage having an energy exchange voltage of about 16 V is also obtained.

As shown in FIGS. 1 and 3, the resonant region of the first-order Bragg grating 9 is 1154.44 nm to 1545.6 nm, the input optical signal is coherent and has a power of 6 dBm (about 3.891 mW), and the voltage of the control signal is 0 V. In the case, when the wavelength of the input optical signal changes, the power of the first and second optical output signals also changes. In the resonance region, the second light output signal has a maximum energy of 2.95 mW due to the strongest constructive interference, and the first light output signal has a minimum energy of 0.23 mW due to the most destructive interference, which can be found at the strongest interference wavelength. Energy is concentrated in one of the light output signals.

<applies to light modulation>

As shown in FIG. 1 and FIG. 4, the first preferred embodiment of the light extraction method of the present invention is applied to light modulation and includes the following steps:

Step 1: providing a light extraction device 10, the light extraction device 10 includes a dual light generating unit 8 and a first order Bragg grating 9, the dual light generating unit 8 is operable to receive an input optical signal and a control signal. And generating, according to the input optical signal, first and second optical signals having a phase difference related to the control signal, the first-order Bragg grating 9 having a first end and a second end operable to receive from the first end Receiving the first optical signal and receiving the second optical signal from the second end, and causing interference of light in a predetermined wavelength range, and outputting the first and second lights from the first end and the second end respectively output signal.

Step 2: Supply the input optical signal to the dual light generating unit 8, the input optical signal is substantially coherent and has a wavelength falling within the preset wavelength range.

Step 3: supplying the control signal to the dual light generating unit 8, the control signal having a state sufficient for the power of the first and second optical signals output by the first-order Bragg grating 9 to be respectively at a preset first The second level. For example, according to FIG. 3, the voltage of the control signal is 11.2 V, and the power of the power of the first and second optical signals is 2.04115 mW and 0.76543 mW, respectively.

<applies to optical switch>

As shown in FIG. 1 and FIG. 5, a second preferred embodiment of the light extraction method of the present invention is applied to an optical switch and includes the following steps: Step 4: providing a light extraction device, 10 the light extraction device includes a dual light generation unit 8 and a first-order Bragg grating 9, the dual-light generating unit 8 is operable to receive an input optical signal and a control signal, and generate first and second light having a phase difference related to the control signal according to the input optical signal a first-order Bragg grating 9 having a first end and a second end operable to receive the first optical signal from the first end and the second optical signal from the second end, and The light interference is caused in the preset wavelength range, and the first and second light output signals are respectively output from the first end and the second end; Step 5: providing the input optical signal to the dual light generating unit 8, the input The optical signal is substantially coherent and has a wavelength falling within the predetermined wavelength range; Step 6: providing the control signal to the dual light generating unit, the control signal having a first state sufficient for the first order The first output of Bragg grating 9 And the power of the second optical signal are substantially maximum and substantially minimum; and Step 7: Adjusting the control signal to a second state is sufficient for the powers of the first and second optical signals output by the first-order Bragg grating 9 to be substantially minimum and substantially maximum, respectively.

For example, according to FIG. 2, in step 6, the voltage of the control signal is 15.9V, and the power of the first and second optical signals is 2.3374mW and 0.55967mW, respectively. In step 7, the voltage of the control signal is 0V. The power of the first and second optical signals is 0.52675 mW and 2.35802 mW, respectively.

In summary, when the preferred embodiment of the present invention is applied as an optical switch, the interference can be changed only by controlling the phase of one of the two optical signals received by the first-order Bragg grating 9. As a result, the output power is mainly concentrated in one of the light output signals to form an optical switch, and the present invention can be applied as a light modulator more than the conventional design can reduce the complexity of the design.

The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.

1. . . Provided steps

2. . . Steps to input light

3. . . Control step

4. . . Provided steps

5. . . Steps to input light

6. . . Control step

7. . . Adjustment steps

8. . . Dual light generating unit

81. . . Light separator

82. . . Optical phase adjuster

83, 84. . . Optical circulator

9. . . First order Bragg grating

10. . . Light extraction device

1 is a circuit diagram of a preferred embodiment of the light extraction device of the present invention; FIG. 2 is an experimental result of the preferred embodiment; FIG. 3 is another experimental result of the preferred embodiment; A flow chart of a first preferred embodiment of the method; and Figure 5 is a flow chart showing a second preferred embodiment of the light extraction method of the present invention.

8‧‧‧Double light generating unit

81‧‧‧Light separator

82‧‧‧Optical phase adjuster

83, 84‧‧‧ optical circulator

9‧‧‧First-order Bragg grating

10‧‧‧Light extraction device

Claims (4)

A light extraction device comprising: a dual light generating unit adapted to receive an input optical signal and a control signal, and generate a first and second optical signals whose phase difference is related to the control signal according to the input optical signal, the double The light generating unit comprises: an optical splitter having an input end and a second output end, the optical splitter being adapted to receive the input optical signal from the input end and split the input optical signal into two lights having substantially the same power a signal output from the two output terminals; an optical phase adjuster having an input coupled to one of the output ends of the optical splitter, an output end, and a control end, the optical phase adjuster being adapted to The control terminal receives the control signal, and adjusts a phase of the optical signal received from the input terminal to output from the output terminal according to the control signal; and a two optical circulator, wherein the optical circulator has a coupling to the optical phase a first end of the output end of the adjuster, a second end for outputting the first optical signal and receiving the first optical output signal, and a third end, the other optical switch having a light coupled to the light a first end of the other output of the off device, a second end for outputting the second optical signal and receiving the second optical output signal, and a third end, each optical circulator receiving from the first end The optical signal is output from the second end, and the optical signal received from the second end is output from the third end; and a first-order Bragg grating includes a first end receiving the first optical signal and Receiving a second end of the second optical signal and at a predetermined wave Light interference occurs in a long range, and first and second light output signals are output from the first end and the second end, respectively. The light extraction device of claim 1, wherein the optical splitter is a -3 dB coupler. A light extraction method comprising the steps of: (a) providing a light extraction device, the light extraction device comprising a dual light generation unit and a first order Bragg grating, the dual light generation unit being operable to receive an input optical signal and a control signal, and generating, according to the input optical signal, first and second optical signals having a phase difference related to the control signal, the first-order Bragg grating having a first end and a second end operable to Receiving the first optical signal at one end and receiving the second optical signal from the second end, and causing interference of light in a predetermined wavelength range, and outputting the first and the first end and the second end respectively a second light output signal, the dual light generating unit includes an optical splitter, an optical phase adjuster and a two optical circulator, the optical splitter having an input end and two output ends, the optical splitter being adapted to receive from the input Receiving the input optical signal, and dividing the input optical signal into two optical signals having substantially the same power, respectively, for outputting from the two output ends, the optical phase adjuster having a coupling to the optical splitter An input end, an output end and a control end, the optical phase adjuster is adapted to receive the control signal from the control end, and adjust a phase of the optical signal received from the input end according to the control signal to output from the output The output end of the optical multiplexer has a first end coupled to the output end of the optical phase adjuster, a second end outputting the first optical signal, and receiving the first optical output signal, and a third end, the other optical switch has a first end coupled to the other output end of the optical splitter, a second end outputting the second optical signal and receiving the second optical output signal, and a first end a three end, each optical circulator outputting an optical signal received from the first end from the second end, and outputting an optical signal received from the second end from the third end; (b) supplying the optical signal Inputting an optical signal to the dual light generating unit, the input optical signal being substantially coherent and having a wavelength falling within the predetermined wavelength range; and (c) supplying the control signal to the dual light generating unit, the control The signal has a state sufficient for the power of the first and second optical signals output by the first-order Bragg grating to be at predetermined first and second levels, respectively. A light extraction method comprising the steps of: (a) providing a light extraction device, the light extraction device comprising a dual light generation unit and a first order Bragg grating, the dual light generation unit being operable to receive an input optical signal and a control signal, and generating, according to the input optical signal, first and second optical signals having a phase difference related to the control signal, the first-order Bragg grating having a first end and a second end operable to Receiving the first optical signal at one end and receiving the second optical signal from the second end, and causing interference of light in a predetermined wavelength range, and outputting the first and the first end and the second end respectively a second optical output signal; (b) providing the input optical signal to the dual light generating unit, the input optical signal being substantially coherent and having a wavelength falling within the predetermined wavelength range; (c) providing the control Signal to the dual light generating unit, the control signal Having a first state sufficient to cause the first and second optical signals output by the first order Bragg grating to be substantially maximum and substantially minimum, respectively; and (d) adjusting the control signal to a second state, sufficient The powers of the first and second optical signals output by the first order Bragg grating are substantially minimum and substantially maximum, respectively.