CN113132013B

CN113132013B - Direct-modulation type multichannel cooperative reconfigurable microwave photon acquisition chip

Info

Publication number: CN113132013B
Application number: CN202110547200.9A
Authority: CN
Inventors: 邹喜华; 邹放; 李沛轩; 刘丰玮; 潘炜; 闫连山
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2021-05-19
Filing date: 2021-05-19
Publication date: 2022-04-29
Anticipated expiration: 2041-05-19
Also published as: CN113132013A

Abstract

The invention discloses a direct modulation type multichannel cooperative reconfigurable microwave photon acquisition chip, which is constructed in a wavelength division multiplexing mode based on high-density integration of multiple paths of parallel DMLs; then, combining with external light injection locking to obtain multi-path coherent output wavelengths, and realizing multi-channel cooperative acquisition; the acquisition channels are divided into two groups, the first group of DML acquisition channels are directly combined and output by an MMI type combiner, and support multi-channel cooperative acquisition; the second group of DML outputs and receives an on-chip micro-ring resonant cavity processing module; the filtering characteristic of the micro-ring is adjusted based on the thermo-optic effect, dynamic wavelength channel selection is achieved, and a reconfigurable multi-channel acquisition function is supported. The invention has the advantages of simple realization, dense multi-channel cooperative acquisition, dynamic reconfiguration and the like, and has important application in systems of optical communication, photoelectric signal processing and the like.

Description

Direct-modulation type multichannel cooperative reconfigurable microwave photon acquisition chip

Technical Field

The invention belongs to the field of multi-channel acquisition of analog microwave signals, and particularly relates to a direct-modulation multi-channel cooperative reconfigurable microwave photon acquisition chip.

Background

The multichannel acquisition and reception of microwave signals occupy an indispensable key position in military and civil microwave system applications such as radar, wireless communication and the like, and relate to a plurality of key technologies such as channelization, array signal processing, Multiple Input Multiple Output (MIMO) and the like. With the continuous development and evolution of information technology and the continuous acceleration of the informatization process of weaponry, an integrated microwave system with multi-band, multi-system, multi-function and multi-platform integration becomes the key development direction of future military and civil fields, and relates to air-space-ground integration, 5G/B5G ultra-dense heterogeneous networks, detection/interference/detection/communication integrated electronic systems and the like. The traditional electronic technology is limited by the problems of electronic bottlenecks such as narrow bandwidth, electromagnetic compatibility tolerance, large transmission loss, low processing speed and the like, and the requirements of ultra-wideband and multi-band signal compatible acquisition and reception required by the development trend of integrated microwave systems are difficult to meet. As a cross discipline integrating microwave technology and photon technology, signal acquisition and reception based on the microwave photon technology has the characteristics of wide frequency spectrum coverage range, large instantaneous bandwidth, low transmission loss, electromagnetic interference resistance and the like, and has obvious advantages in the application of the integrated microwave system.

However, the microwave photonic system mainly comprising discrete components and optical fiber links faces performance bottlenecks such as volume, power consumption, cost, stability and the like when implementing a multi-channel microwave signal acquisition function. Based on the photonic integration technology, the problems can be effectively overcome: the japan institute of Fujitsu utilizes a 1310nm directly modulated distributed reflection laser array structure to fabricate a multi-channel transmitting chip (m.matsuda, a.uesay, t.simoyama, et al, "" 1.3- μm-wavelength AlGaInAs multiple-quality-well-mixed-modulated-reflected-laser array on-modulated InP substrate "with Four different wavelength channels on a semi-insulating indium phosphide substrate, and" IEEE Journal of Selected photodiodes in Quantum Electronics, 21, 6, 241-247,2015 ", while the related group of semiconductor institute of china and science and technology" utilizes a directly modulated Distributed Feedback (DFB) laser array structure to realize a multi-channel signal acquisition module (i.e., acquisition module) with a channel acquisition module (i.4 nm, 1550, 8 nm, 3. integrated laser array structure, "Chinese Physics B, vol.22, No.5, art.054211,2013.), (Zhang, Yi-ming, et al," "Reconfigurable WDM-PON emitted by a low-cost 8-channel directed modulated laser module," Optoelectronics Letters, vol.13, No.6, pp.423-426,2017.). The main limitations of the multi-channel microwave photon acquisition chip/module reported at present are as follows: each acquisition channel is independent, and the acquisition of the cooperative signals among multiple channels cannot be realized; the structure and the function are fixed, the flexibility is not enough, and the flexible recombination of a plurality of channels cannot be realized.

Disclosure of Invention

In view of the advantages of the microwave photon technology in processing broadband signals and the defects of the technology, the invention provides a direct modulation type multichannel cooperative reconfigurable microwave photon acquisition chip.

The direct modulation type multichannel cooperative reconfigurable microwave photon acquisition chip provided by the invention adopts a multichannel parallel high-density integrated Direct Modulation Laser (DML) array, constructs a multichannel (not less than 8) acquisition chip in a wavelength division multiplexing mode, and implements microwave signal electro-optical conversion, namely microwave photon signal acquisition. And then, combining external light injection locking to obtain multi-path coherent output wavelengths, realizing multi-channel cooperative acquisition, realizing dynamic wavelength channel selection by utilizing the on-chip adjustable micro-ring resonant cavity, and supporting reconfigurable multi-channel cooperative acquisition. In particular, it is composed of two groups of different acquisition channels.

In the first group of acquisition channels, an external light source is input from an injection light port, is divided into different paths of optical signals by a multi-path MMI branching unit, is input into a corresponding multi-path parallel directly-modulated laser array, and the parallel directly-modulated laser array acquires multi-path broadband analog microwave electrical signals so as to generate multi-path coherent optical carriers, is parallelly accessed into an MMI type combiner, and is output to an output light port after being combined, and multi-channel cooperative acquisition of analog signals is completed.

In the first group of acquisition channels, broadband analog microwave signals are directly acquired by the direct modulation laser array and modulated onto coherent light carriers with the same or different wavelengths to perform multi-path cooperative processing.

In the second group of acquisition channels, after an external light source finishes injection locking and broadband analog microwave signal acquisition sequentially through an injection light port, a multi-path MMI splitter and a multi-path direct-modulated laser array, light signals of every two direct-modulated lasers are input into a 2 x 1MMI type wave combiner, and are input into a micro-ring resonant cavity processing module after being coupled by a plurality of 2 x 1MMI type wave combiners; the output optical signals of the micro-ring resonant cavity processing module are parallelly accessed into an MMI type combiner and output to an output optical port after being combined, so that the multi-channel dynamically reconfigurable electro-optical receiving function is realized.

In the second group of acquisition channels, each group of coherent optical signals is subjected to free wavelength switching processing by utilizing an on-chip integrated micro-ring resonant cavity processing module, so that the multi-channel dynamically reconfigurable electro-optical receiving function is realized.

Furthermore, in the directly modulated laser, a broadband analog microwave electrical signal acquired from the outside of the chip is used as a modulation voltage to directly modulate the optical signal.

Further, the electrical input to the array of directly tuned lasers is one broadband analog microwave signal, or a plurality of analog microwave signals of different bandwidths.

Furthermore, the micro-ring resonant cavity processing module consists of an AMZI type optical splitter, a micro-ring waveguide and an optical phase shifter; the optical signal is coupled to a micro-ring waveguide via an AMZI splitter, in which an optical phase shifter is added.

Furthermore, the AMZI type optical splitter consists of an MMI type wave splitter, an optical phase shifter and an MMI type wave combiner, and the coupling ratio of the AMZI type optical splitter is adjusted and controlled through a thermo-optic effect.

Further, the directly modulated laser is an on-chip distributed feedback laser.

The beneficial technical effects of the invention are as follows:

1. constructing a dense integrated multi-channel microwave photon acquisition chip based on an active and passive photon hybrid integration technology;

2. the multi-channel acquisition is implemented by adopting a direct modulation laser, the system complexity is greatly reduced, and the multi-channel cooperative acquisition is realized by an external light injection locking technology.

3. The tunable filter characteristic of the on-chip micro-ring resonant cavity processing module is utilized to realize dynamic wavelength channel selection and support a dynamic reconfigurable acquisition function.

Drawings

Fig. 1 is a schematic structural diagram of a multi-channel acquisition chip according to the present invention.

Fig. 2 is a schematic diagram of injection locking and direct modulation of a directly modulated laser.

FIG. 3 is a schematic structural diagram of a micro-ring resonator processing module.

FIG. 4 is a schematic diagram of an AMZI type optical splitter.

In the figure: DML: a directly modulated laser; MMI: a multi-mode interference-type coupler; AMZI: an asymmetric mach-zehnder interferometer.

Detailed Description

The invention is described in further detail below with reference to the figures and the detailed description.

The directly-modulated multi-channel cooperative reconfigurable microwave photon acquisition chip comprises two multipath MMI type splitters 20, a DML array 30, a plurality of 2 multiplied by 1MMI type splitters 40, a plurality of micro-ring resonant cavity processing modules 50 and two Nmultiplied by 1MMI combiners 60, as shown in figure 1. In particular, it is composed of two groups of different acquisition channels.

In the first group of collecting channels, an external light source is input from the injection light port 10, is divided into different optical signals by the multi-path MMI splitter 20, and is input into the corresponding multi-path parallel directly modulated laser array 30, so as to generate multi-path coherent light carriers. As shown in fig. 2, in the directly modulated laser, a broadband analog microwave electrical signal collected from the outside of the chip is directly modulated as a modulation voltage on an optical signal. Then, the signals are parallelly connected to an MMI type combiner 60, and are output to an output optical port 70 after being combined, so that the multi-channel cooperative acquisition of analog signals is completed.

In the second group of acquisition channels, after an external light source finishes injection locking and broadband analog microwave signal acquisition sequentially through an injection light port 10, a multi-path MMI splitter 20 and a multi-path direct-modulated laser array 30, light signals of every two direct-modulated lasers are input into a 2 × 1MMI type combiner 40, and are input into a micro-ring resonant cavity processing module 50 after being coupled by a plurality of 2 × 1MMI type combiners 40; the output optical signals of the micro-ring resonant cavity processing module 50 are parallelly connected to the MMI-type combiner 60, and are output to the output optical port 70 after being combined, so that the multi-channel dynamically reconfigurable electro-optical receiving function is realized.

Further, as shown in fig. 3, the micro-ring resonator processing module 50 is composed of an AMZI type optical splitter 501, a micro-ring waveguide 502, and an optical phase shifter 503; the optical signal is coupled to the micro-ring waveguide 502 via the AMZI splitter 501, and the initial free spectral range of the micro-ring waveguide 502 is determined by its material and ring length, simply by the optical path length, which is here designed as the initial wavelength interval value of the DML array 30. To achieve dynamic wavelength channel selection, an optical phase shifter 503 is added to the microring waveguide 502. Based on the thermo-optic effect, the micro-ring adjustable filtering characteristic can be used for realizing dynamic wavelength channel selection and supporting reconfigurable multi-channel cooperative acquisition.

Further, as shown in fig. 4, the AMZI splitter 501 is composed of an MMI splitter 5011, an optical phase shifter 5012, and an MMI combiner 5013, and the Q value of the micro-ring can be adjusted by adjusting and controlling the coupling ratio of the AMZI splitter 501 by the thermo-optical effect.

The actual implementation process is as follows: an external light source is input from the injection light port 10, and is split into multiple optical signals by the MMI-type demultiplexer 20 to inject-lock the DML array 30. When the DML array 30 collects broadband analog microwave signals, the operating wavelength thereof is adjustable within the commonly used C-band range. The initial wavelength of the DML array 30 is set to a series of different values that are adjacent and equally spaced within the C-band. When the DML array 30 is locked to the injected light, its operating wavelength changes with the injected light, producing a series of optical carriers that are coherent with the injected light. Then, the broadband analog electric signal is modulated onto the parallel coherent optical carriers to complete multi-channel cooperative acquisition. The electrical input to the DML array 30 may be one broadband analog microwave signal or a plurality of analog microwave signals of different bandwidths.

Claims

1. A direct modulation type multichannel cooperative reconfigurable microwave photon acquisition chip is characterized in that a multichannel parallel high-density integrated direct modulation laser array is adopted, a multichannel acquisition chip is constructed in a wavelength division multiplexing mode, and microwave signal electro-optic conversion, namely microwave photon signal acquisition, is implemented; then, combining with external light injection locking to obtain multi-path coherent output wavelengths, realizing multi-channel cooperative acquisition, realizing dynamic wavelength channel selection by utilizing an on-chip adjustable micro-ring resonant cavity, and supporting reconfigurable multi-channel cooperative acquisition; the system specifically comprises two groups of different acquisition channels:

in the first group of acquisition channels, an external light source is input from an injection light port (10), is divided into different paths of optical signals by a multi-path MMI branching unit (20), is input into a corresponding multi-path parallel directly modulated laser array (30), acquires multi-path broadband analog microwave electrical signals by the parallel directly modulated laser array (30), generates multi-path coherent optical carriers, is parallelly accessed into an MMI type combiner (60), and is output to an output light port (70) after being combined, so that multi-channel cooperative acquisition of analog signals is completed;

in the second group of acquisition channels, after an external light source finishes injection locking and broadband analog microwave signal acquisition sequentially through an injection light port (10), a multi-channel MMI splitter (20) and a multi-channel directly modulated laser array (30), light signals of every two directly modulated lasers are input into a 2 x 1MMI type wave combiner (40), and are input into a micro-ring resonant cavity processing module (50) after being coupled by a plurality of 2 x 1MMI type wave combiners (40); the output optical signals of the micro-ring resonant cavity processing module (50) are parallelly accessed into an MMI type combiner (60) and output to an output optical port (70) after being combined, so that the multi-channel dynamically reconfigurable electro-optical receiving function is realized;

the micro-ring resonant cavity processing module (50) is composed of an AMZI type optical splitter (501), a micro-ring waveguide (502) and an optical phase shifter (503); the optical signal is coupled to a micro-ring waveguide (502) through an AMZI type optical splitter (501), and an optical phase shifter (503) is added in the micro-ring waveguide (502); the AMZI type optical splitter (501) is composed of an MMI type wave splitter (5011), an optical phase shifter (5012) and an MMI type wave combiner (5013), and the coupling ratio of the AMZI type optical splitter (501) is adjusted and controlled through a thermo-optic effect.

2. The direct modulation type multi-channel cooperative reconfigurable microwave photon collection chip according to claim 1, wherein in the direct modulation laser, a broadband analog microwave electric signal collected from the outside of the chip is used as a modulation voltage to directly modulate an optical signal.

3. The direct-modulation type multi-channel cooperative reconfigurable microwave photon collection chip according to claim 1, wherein the electrical input of the direct-modulation laser array (30) is one broadband analog microwave signal or a plurality of analog microwave signals with different bandwidths.

4. The direct modulation type multi-channel cooperative reconfigurable microwave photon collection chip according to claim 1, wherein the direct modulation laser is an on-chip distributed feedback laser.