CN202075354U - Detection device for burst mode of laser - Google Patents

Abstract

The utility model discloses a detection device for a burst mode of a laser, which is characterized by comprising a detection module, a preset module, an output module and a comparer, wherein the detection module is connected with a backlight diode and provided with a monitoring end capable of outputting voltage signals; the preset module is provided with a preset end capable of outputting specific reference voltage; the output module is provided with a drive end and a judge end which is controlled by signals from the drive end; the comparer is provided with two input ends and one output end; the input ends are connected with the monitoring end and the preinstall end respectively; and the output end is connected with the drive end. The detection device for judging the burst mode of the laser is formed by the three modules and the comparer and has a simple and reliable structure.

Description

A kind of laser instrument burst mode pick-up unit

Technical field

The utility model designs a kind of auxiliary circuit of optical fiber communication laser instrument, specifically is a kind of laser instrument burst mode pick-up unit.

Background technology

In optical fiber communication, laser instrument has the duty of a kind of being referred to as " burst mode ".This state of working in is the difference that relative " continuous mode " done; The laser instrument that is in " burst mode " can continuous working when being authorized to, and closes when cancellation is authorized, and this is a purpose of dividing the work, avoided signal conflict in order to reach for a long time.

This pattern needs the duty of monitoring laser, and the electric current of control laser instrument, the conclusion of feeding back its light output, whether being closed or open then are convenient to total system and are worked in an orderly manner under burst mode.So, the auxiliary circuit of laser instrument there is a kind of demand, making to have a kind of testing circuit, can succinctly realize the judgement to the laser instrument on off operating mode effectively, and can be integrated among laser driving chip or the light emitting module.

The utility model content

At above demand, the utility model proposes a kind of laser instrument burst mode pick-up unit, its technical scheme is as follows:

A kind of laser instrument burst mode pick-up unit, it comprises:

One detection module, this detection module connect a diode backlight, and have the monitoring client of an exportable voltage signal;

One presetting module, this presetting module have the default end of an exportable specific reference voltage;

One output module, this output module have a drive end and held by the judgement of drive end signal controlling; And

One comparer, described comparer have two input ends and an output terminal; Described input end is connected with described monitoring client, default end respectively; Described output terminal is connected with described drive end.

Preferred person as technical solutions of the utility model, can do following improvement:

In one preferred embodiment, described detection module comprises one first resistance (R1) and electric capacity (C) parallel with one another; Described first resistance (R1) is an end ground connection wherein, and the other end connects described diode cathode backlight and as described monitoring client.

In one preferred embodiment, described presetting module comprises:

Second, third, a resistor voltage divider network of the 4th and the 5th resistance (R2, R3, R4 and R5) series connection; Second resistance described in this resistor voltage divider network (R2) outer end connects a controlled current source (202), described the 5th resistance (R5) outer end ground connection;

Other has an end of one first switch (K1) to connect the tie point of the second and the 3rd resistance (R2 and R3); One end of one second switch (K2) connects the tie point of third and fourth resistance (R3 and R4); One end of one the 3rd switch (K3) connects the tie point of the 4th and the 5th resistance (R4, R5);

The other end of described first, second and the 3rd switch (K1, K2 and K3) connects altogether, and as described default end.

In one preferred embodiment, described output module comprises:

One first metal-oxide-semiconductor (M1) and one the 6th resistance (R6); Described first metal-oxide-semiconductor (M1) grid is as the drive end of described output module;

The drain electrode of this first metal-oxide-semiconductor (M1) is as described judgement end, and described the 6th resistance of process (R6) connects power supply; The source ground of first metal-oxide-semiconductor (M1).

The beneficial effect that the utility model brings is:

1. three modules and comparer constitute the pick-up unit of judging the laser instrument burst mode, and be simple for structure reliable.

2. the be content with very little requirement of multiple judgement time-delay and precision of the presetting module of band resistor voltage divider network.

3. the device circuit is simple, easily realizes integrated.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing embodiment:

Fig. 1 is the utility model embodiment one block diagram;

Fig. 2 is the utility model embodiment two block diagrams;

Fig. 3 is the utility model embodiment three block diagrams;

Fig. 4 is the utility model embodiment four block diagrams.

Embodiment

Embodiment one:

As shown in Figure 1, the utility model embodiment one block diagram.Detection module 100 is communicated with the diode PD backlight of monitoring laser, and the photocurrent that PD is exported is converted to a direct current magnitude of voltage connects comparers 300 by monitoring client 101 negative input end; By decision level of demand definition, be connected to the positive input terminal of comparer 300 by default end 201 in the presetting module 200; The output terminal of comparer 300 is together with the drive end of output module 400.

In the real work, the luminous situation of diode PD detection laser backlight, the magnitude of voltage that conversion obtains is compared with the decision level of default end 201 by comparer 300, when the detected laser instrument luminous power of PD during less than certain respective value, being lower than its positive input terminal voltage with the negative input end voltage of comparer 300 is sign, high level of comparer output this moment, be used to drive output module 400 and final signal by judgement end 402 these state correspondences of output, because this signal can be enumerated with high-low level, so, height, the just corresponding indication that shows laser instrument " luminous " and " not luminous " of low level signal.

Embodiment two:

As Fig. 2, be the utility model embodiment two block diagrams; The detection module of this embodiment two is shown in circuit in Fig. 2 frame of broken lines.R1 is in parallel with C, and the electric current that will flow through the PD anode carries out exporting comparer to by monitoring client 101 after the voltage sampling.Wherein the effect of capacitor C is the high frequency ac signal at filtering R1 two ends.

Embodiment three:

As Fig. 3, the utility model embodiment three block diagrams; The presetting module of this embodiment three mainly is by the resistance pressure-dividing network that comprises R2-R5 and controlled current source 202 and switch arrays K1-K3.DAC is that an external digital signal transforms the analog control signal 203 that obtains, and loads on the control end of controlled current source 202.Each is provided with down and can obtains stable voltage at each resistance two ends of R2-R5, and makes up by the break-make of K1-K3, can finally obtain the multidecision level from default end 201.This has enriched some analog control signals 203 times, and the selectable judgement of system is according to number.

Embodiment four:

As Fig. 4, the utility model embodiment four block diagrams.Among this embodiment four, output module comprises a metal-oxide-semiconductor, a drain resistance R6, and the grid of metal-oxide-semiconductor M1 drains and makes judgement end 402 as the drive end of this output module.As can be known, the level inversion of drive end 401 and judgement end 402, and judgement end 402 can be with the setting of the performance of M1, R6 to export different judgement electric currents to connect the circuit of outside, back level.

The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented according to this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model contains.

Claims (4)

1. laser instrument burst mode pick-up unit, it is characterized in that: it comprises:

One detection module, this detection module connect a diode backlight, and have the monitoring client of an exportable voltage signal;

One presetting module, this presetting module have the default end of an exportable specific reference voltage;

One output module, this output module have a drive end and held by the judgement of drive end signal controlling; And

One comparer, described comparer have two input ends and an output terminal; Described input end is connected with described monitoring client, default end respectively; Described output terminal is connected with described drive end.

2. a kind of laser instrument burst mode pick-up unit according to claim 1 is characterized in that: described detection module comprises one first resistance (R1) and electric capacity (C) parallel with one another; Described first resistance (R1) is an end ground connection wherein, and the other end connects described diode cathode backlight and as described monitoring client.

3. a kind of laser instrument burst mode pick-up unit according to claim 1, it is characterized in that: described presetting module comprises:

Second, third, a resistor voltage divider network of the 4th and the 5th resistance (R2, R3, R4 and R5) series connection; Second resistance described in this resistor voltage divider network (R2) outer end connects a controlled current source (202), described the 5th resistance (R5) outer end ground connection;

Other has an end of one first switch (K1) to connect the tie point of the second and the 3rd resistance (R2 and R3); One end of one second switch (K2) connects the tie point of third and fourth resistance (R3 and R4); One end of one the 3rd switch (K3) connects the tie point of the 4th and the 5th resistance (R4, R5);

The other end of described first, second and the 3rd switch (K1, K2 and K3) connects altogether, and as described default end.

4. a kind of laser instrument burst mode pick-up unit according to claim 1, it is characterized in that: described output module comprises:

One first metal-oxide-semiconductor (M1) and one the 6th resistance (R6); Described first metal-oxide-semiconductor (M1) grid is as the drive end of described output module;

The drain electrode of this first metal-oxide-semiconductor (M1) is as described judgement end, and described the 6th resistance of process (R6) connects power supply; The source ground of first metal-oxide-semiconductor (M1).

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