Multi-frequency laser source for fiber optic

 

The invention relates to the field of laser technology, specifically, to systems and fiber optic connection. The proposed source, in particular, contains an active element with a frequency selector, made in the form of the integrated optical Michelson echelon running on reflection. The input end of the selector is made in the form of a cylindrical microlens, and the output is in the form of a flat was highly reflective mirrors. Consequently, the proposed source of multi-frequency radiation has a high accuracy of the position of the generated frequencies with low optical loss intracavity selectivity of the element and has a high reproducibility of the output parameters. 3 C.p. f-crystals, 2 Il.

The invention relates to the field of laser technology, in particular to systems fiber-optic communication, and laser systems used in computer science, sensor technology, equipment and medicine.

Known multi-frequency radiation source, containing on the same substrate 20 lasers with distributed feedback in the form of gratings of different period (C. E. Zah, M. R. Amersfoort, B. Pathak, F. Favire at all "Wavelength accurancy and output power of multiwavelength DFB laser arrays with integrated star couplers and optical amplifiers", IEEE Photonics Technology Le fabrication of gratings of different period, as well as the need to use sophisticated technology re-growth of semiconductor layers of the structure after fabrication of the gratings. Poor repeatability of the process of silting gratings makes the technology unsuitable for mass production.

Closest to the claimed is known semiconductor source multi-frequency radiation, containing as selectivity intracavity element integrated optical analog of the Michelson echelon. So similar is the set of channel waveguides of different lengths, and the length of each channel is different from the previous length by the same amount. The input and output ends of the set of channel waveguides connected to the focusing glider structures, with outputs in the form of one or more of the channel waveguides. In the present work (M. Zirngill, C. H. Joyner, C. R. Doerr, L. W. Stulz, H. M. Gardens "An 18-cannal multifreguency laser" IEEE Photonics Technology Letters v.8, N 7, p.870, 1996) these output channels are laser structure. Disadvantages closest analogue is the relatively large size of the laser source (189 mm2), low frequency modulation of lasers, large optical loss in the integral-is the rotary.

Using the present invention solves the technical problem of creating a source of multi-frequency radiation with high frequency modulation of lasers with low optical loss intracavity selectivity element and a high frequency output parameters for the production of this radiation source.

The technical problem is solved by the fact that in a well-known source of multi-frequency radiation, containing active elements, selectivity element in the form of integrated-optic Michelson echelon running on the passage as well as the mirrors forming the resonator type Fabry-Perot interferometer, as the selectivity of the element introduced the integrated optical Michelson echelon running on reflection, and as an active element used line of semiconductor laser diodes (channel amplifier), the output end of which is applied the output mirror and the input end caused the antireflection coating, and channel amplifiers are connected with the output channel selector through the microlenses, performed on the input end of the selector, while the second end of the selector applied fully reflecting mirror.

In particular, spectralogic selector, providing a flat wave front incident on a fully reflecting mirror of the source.

In particular, the multi-frequency laser source equipped with a programmable switch the injection current of the pump of the individual laser diodes in the line, ensuring the inclusion of an arbitrary number of channels generate in a random time sequence.

In particular, the output ends of the channel laser diode in the line connected to the input of the integrated optical Michelson echelon running on the passage and uniting all keywords. channels generate in a single optical fiber.

In particular, reflecting the end of the selector may be in the form of an end face of the planar waveguide, and coupled with a channel waveguides by o adiabatically expanding sections of the channel waveguides.

In particular, the selector contains additional channel waveguides for quality control of cylindrical microlenses, and the input ends of these waveguides are connected with fiber light guides.

In particular, the cylindrical lens at the input end of the selector enlightened, and additional channel waveguides selector is used to control the alignment of microlin is stabilizacii temperature of the source.

The essence of the invention is that the integrated optical train running on the passage, displays some point one color on the sign-in quite a point of the same color output. This property echelon can be used as selective intracavity element. As already noted, the Michelson echelon running on the passage, is a set of channel waveguides of different lengths, and lN+1-lN=l=const, where N=1, 2, 3... number of the waveguide, starting from the shortest waveguide. The input and output ends of the channel waveguides of the set are arranged on arcs of a circle, thereby providing the same amplitudes and phases are excited in them waves and focus light of different frequencies at the output. Due to the difference of the lengths of the channel waveguides initially spherical wave front (at different frequencies) in the train is converted into a flat. This condition front for all frequencies is achieved on the symmetry axis of the integrated optical Michelson echelon, but for one of them (the Central) the wave front parallel to this axis. If the axis of symmetry of the echelon position of the reflecting mirror, the reected light with a center frequency of Hgih the points on the circle, located near the starting point. However, if light of a certain frequency will come from its corresponding frequency point on the input of a circle, then after reflection on the mirror located on the axis of symmetry, this light, as the light of the Central frequency will go again to its original point. Location somatopause points at the input of the echelon can determine if radiation of different frequencies to enter in channel waveguides via their ends to the reflecting mirror, and the front entered the waves at all frequencies must be parallel to the mirror.

The length of the reflecting echelon twice as long as normal train running on the aisle. In the resonator of the proposed multi-frequency laser entered the Michelson echelon running on reflection and role intracavity spectral selector. As the active element of the laser used, the range of laser diodes, each of which has a wide range of gain in a given wavelength range. One end of the line has a reflective coating (i.e., the output mirror and ar coating. Optically coated the ends of the channel amplifiers line connected with the ends, too enlightened, input channel Volno is on, but back returns in each channel amplifier radiation of only one, well-defined wavelength. Therefore, in each channel of the amplifier is amplified radiation of the same wavelength, which is the result of many passages in the resonator becomes a laser. All laser diodes in the line of work independently, simultaneously or sequentially in any combination separated spectral channels.

The invention is illustrated in Fig.1 and 2.

In Fig.1 presents a diagram of the inventive multi-frequency radiation source. The source contains the output mirror 1 printed at the end of the active element 2, the active element is a line of laser diodes, the second (inner) end of which is enlightened (R<0.5 percent). Each laser diode in the line represents the channel waveguide 3. The range of laser diodes optically interfaced with the spectral selector 4, which represents the integrated optical Michelson echelon running on reflection. The train consists of a series of 5 input channel waveguides associated with the area of the planar waveguide 6, limited by circular arcs Roland input and output. The output boundary of the planar waveguide is associated with a set of 7 curved kanalnye waveguides equipped with linear heater 9 for fine adjustment of the phase incursion of the light wave in them. The ends of the linear channel waveguides polished and bear fully reflective coating which serves as the second mirror 10 of the laser resonator. The input (output) channel waveguides 5 of the selector 4 is connected with a channel amplifying light waveguide 3 of the active element 2 with a cylindrical microlens 11, which is placed at the end of the selector 15. For quality control of microlenses are channel waveguides 12. The output ends of the laser diodes (channel amplifiers) connected with the output optic fibers 13, provided with end microlenses 14.

In Fig.2 presents a diagram of the relative placement of the elements 4, 2, 13 vertically.

The inventive radiation source operates as follows. Spontaneous emission of the active region 2 source hits the entrance of the channel waveguides 5 Michelson echelon, then passes through the planar waveguide section 6 expands and illuminates evenly all the ends of the curved channel waveguides 7, after passing through the linear section of the channel waveguides 8 radiation falls on deaf mirror 10 is reflected on it and is returned in the input channel waveguides 5. By means of cylindrical microlenses 11 radiation from the channel is subjected to radiation, spectral limited by the selector increases, partially goes through the mirror 1, and the reflected part of it is returned to the cavity, forming his fashion and compensating for the loss of radiation inside the resonator.

Due to the fact that in multifrequency radiation source used in the integrated optical Michelson echelon running on reflection, the length of the laser cavity of the inventive laser is almost twice shorter than the resonator with the train running on the aisle. This circumstance provides twice the speed of information transmission through the fiber optic. In addition, the loss of light in the train running on reflection, twice less than in the train running on the passage, it can provide a laser source, low threshold currents and better power characteristics. However, the most important advantage of the proposed source of radiation is that the frequency of the radiation it is clearly consistent with the frequency of transmitting-receiving devices, fiber optic line, because the basis of these devices and the proposed source are all the same integrated optical echelons Michelson.

Currently, a typical sealing device and the decompression keywords. communication channels that mo is osmotron example of the claimed source of laser radiation, working for (40) forty frequencies in the wavelength range of 1.5 to 1.6 μm. This source used range diode lasers based heterostructure InGaAsP-InP with the quantum-well layers. The typical size range of 0.510 mm2the width of the channel gain 3 μm. As the spectral selector used waveguide structure based on SiO2-SiO2+GeO2-SiO2; (SiO2-SiON-SiO2). The width of the input channel waveguides selector is 3 μm and corresponds to the width of the reinforcing channels of the active element, the height of the channel waveguides of 1.85 μm, whenn=0,05 match the parameters of a single-mode waveguide. The distance between the output channel waveguides is 150 μm, and it naturally coincides with the distance between the reinforcing channels in the active element. The distance between the channel waveguides at the input of the planar section is equal to 8.4 microns. The length of this section is 4546 μm. At the opposite boundary of the planar area are the inputs of the channel waveguides of the Michelson echelon. The number of these waveguides is 164, the distance between them at the entrance is 8.4 μm. The length of the middle curved woernle. The length of the linear channel waveguides with heating elements along them is 10000 μm. Full length selector reaches 27492 μm. This loss of light in the structure of one pass to the mirror and back do not exceed a 3.5 dB. The overall dimensions of the multi-frequency laser light source reach 30 mm in length and 20 mm in width. Typically, the focal length of a cylindrical microlens is close to the thickness of the channel waveguide and the transmission efficiency of light from his channel waveguide diode laser reaches ~90%. Thus, the light loss in the resonator of the laser is equal to 5 dB, are low enough for a semiconductor laser, the gain can reach 20-30 cm-1.

Claims

1. Multi-frequency laser light source containing successively installed active element in the form of a line of semiconductor laser diodes with an output of a partially reflective mirror placed on the outer end of the line lasers, a cylindrical microlens, the frequency-selective element made in the form of the integrated optical Michelson echelon running on reflection, and the second totally reflecting mirror of the laser resonator, nonestrogen waveguides frequency-selective element and they are optically conjugate with each other with the help of cylindrical microlenses.

2. Multi-frequency laser light source under item 1, characterized in that the waveguides of the frequency-selective element is additionally introduced thermo-optical phase control wave.

3. Multi-frequency laser light source under item 1, characterized in that the sections of the waveguides of the frequency-selective element, adjacent to was highly reflective mirror, made o adiabatically expanding.

4. Multi-frequency laser light source under item 1, characterized in that the output ends of the laser diodes in the line connected to the input of the integrated optical Michelson echelon running on the aisle.

 

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