CN109752801A

CN109752801A - The reconfigurable optical delay line system of one mode multiplexing

Info

Publication number: CN109752801A
Application number: CN201811599832.4A
Authority: CN
Inventors: 余宇; 刘巍; 张新亮
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2018-12-26
Filing date: 2018-12-26
Publication date: 2019-05-14
Anticipated expiration: 2038-12-26
Also published as: CN109752801B

Abstract

The invention discloses the reconfigurable optical delay line systems of one mode multiplexing, belong to the integrated opto-electronic device field in Photonic Communications system.System includes: optical mode multiplexer, optical time delay unit, optical mode demultiplexer, and optical time delay unit includes multiple smooth delay units, and each smooth delay unit is made of multiple optical mode switches that can control different opening states and one section of optical delay line.The independent delay control of multiple beam may be implemented in this delay line system, is substantially reduced the area of device, needs to carry out multichannel light delay field applied to optical phased array etc..

Description

The reconfigurable optical delay line system of one mode multiplexing

Technical field

The invention belongs to the integrated opto-electronic device fields in Photonic Communications system, multiple more particularly, to one mode Reconfigurable optical delay line system.

Background technique

Optical delay line is the important optical device of optical communication field, is usually used in data and synchronizes, in the application such as data buffer storage, Microwave photon field can be used for the radar system of igh-speed wire-rod production line, and still constitute the important of microwave photon filter One of device.

The optical delay line of the different amount of delay of a variety of different application requirements in practical applications, therefore amount of delay is adjustable Before optical delay line can preferably be suitable for various occasions, and adjustable delay line has very big application in Intelligent Optical Network Scape.

Also develop to miniaturization and integrated direction recently as optical device, on piece reconfigurable optical time delay device Also it has already appeared.Such as the restructural delay line based on Mach-Zehnder interferometer can only be to list for the adjustable delay line of the prior art Road optical signal is postponed, and size is larger.And in certain application such as multi-taps for needing to postpone multichannel light beam Microwave photon filter, optical phased array etc. then need multiple restructural delay lines, it will occupy biggish area, mention significantly The high cost of device.By taking the test macro in documents CN201611058800 as an example, which needs to take one in front A delayed time system generates a fixed delay inequality come each mode allowed in less fundamental mode optical fibre, needs to use the restructural delay of N root The amount of delay of the road Lai Duige optical signal is adjusted in line, if if on piece is realized every restructural delay line be required to occupy it is big The area of amount.

Summary of the invention

Aiming at the above defects or improvement requirements of the prior art, the present invention provides the reconfigurable opticals of one mode multiplexing to prolong When linear system unite, be applicable to the occasion of multichannel reconfigurable optical delay line, compared with prior art, flexibly configurable amount of delay is special Property, the utilization efficiency raising several times of delay line, the delay of multichannel light beam can be handled in the same time delay device, be reduced The size that delay waveguide portion is accounted for, reduces the size and cost of entire device.

In order to realize that technical purpose of the invention, the present invention adopt the following technical scheme that:

The reconfigurable optical delay line system of one mode multiplexing, including sequentially connected optical mode multiplexer, optical time delay unit With optical mode demultiplexer,

The optical mode multiplexer, for the road the m light beam of input to be converted to higher order mode different from each other simultaneously from basic mode Synthesis light beam is input to optical time delay unit；

The optical time delay unit includes by the sequentially connected N number of smooth delay unit of multimode waveguide, and light delay unit includes one Section multimode waveguide delay line and m optical mode switch, by the light beam of control switch state control AD HOC from multimode waveguide Delay line passes through or bypass passes through, and light beam when passing through from delay line waveguide is made delay process, the light beam passed through from bypass Delay process is not made；

The optical mode demultiplexer, for being converted by the modal cutoff in optical time delay unit output beam and from higher order mode It is exported at basic mode.

Further, there are two types of working conditions: bypass state and pass-through state for the optical mode switch tool；The through state Under state, the light beam of all modes of entrance enters next optical mode switch or multimode waveguide delay line；Under bypass state, a certain spy The light beam of mould-fixed bypasses output, and the light beam of other modes enters next optical mode switch or multimode waveguide delay line.

Further, the multimode waveguide delay line length in the delay line unit is Geometric Sequence relationship.

In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show Beneficial effect:

The present invention utilizes pattern multiplexer, pattern demultiplexer and mode switch, realizes that the mode of restructural delay line is multiple With while the restructural delay line of holding, flexibly configurable delay flow characteristic, introducing mode multiplexing, delay line utilizes effect Rate improves N times nearly (pattern count depending on multiplexing), greatly reduces the size of system.

Detailed description of the invention

Fig. 1 is the reconfigurable optical delay line system schematic of the one mode multiplexing provided in the present invention is implemented.

Fig. 2 is optical mode switch working state schematic diagram during the present invention is implemented.

Fig. 3 is the light delay unit schematic illustration provided during the present invention is implemented.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and It is not used in the restriction present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below Not constituting a conflict with each other can be combined with each other.

As shown in Figure 1, the reconfigurable optical delay line system of one mode multiplexing, comprising: optical mode multiplexer, light delay Device, optical mode demultiplexer.

The optical mode multiplexer includes m input port and an output port, and each input port corresponds to one Light beam is inputted, corresponding to the higher order mode exported in output port；

The optical time delay unit includes N number of smooth delay unit, and the amount of delay difference of each smooth delay unit is at Geometric Sequence, and one As ratio be 2, the minimum precision of delays time to control is the amount of delay of first delay unit；

The optical mode demultiplexer includes an input port and m output port, successively by the light in multimode waveguide Beam separates.

As shown in Fig. 2, there are two types of working conditions: bypass state and pass-through state for the optical mode switch in light delay unit.

When being in bypass state for optical mode switch k, from the mode k of 1,3 port input, it will respectively from 4,2 ports Bypass, and other modes will be from 2,4 ports are straight-through；

When being in pass-through state for optical mode switch k, all modes are inputted from 1,3 port, all will be from 2,4 ports It is straight-through；

It is not intended to limit the specific structure of optical mode switch herein, can satisfy functional requirement.

It is constituted as shown in figure 3, light delay unit is switched by the optical mode of optical delay line and m correspondence and different mode； By controlling the working condition of each optical mode switch, can control each mode be carried out by optical delay line delay or from Optical mode switch bypass, is transferred to next delay unit, and the mode light beam by the last one Switch Cut-through enters light delay Line is delayed；Time delay module is constituted by the cascade of delay unit, it can be with the amount of delay of each mode of independent control.

Optical mode switch in light delay unit can carry out state configuration according to the demand of amount of delay size, realize each The independent control of the amount of delay of the light beam of mode.

As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include Within protection scope of the present invention.

Claims

1. one mode multiplexing reconfigurable optical delay line system, which is characterized in that including sequentially connected optical mode multiplexer, Optical time delay unit and optical mode demultiplexer,

The optical mode multiplexer, for the road the m light beam of input to be converted to higher order mode different from each other and synthesis from basic mode Light beam is input to optical time delay unit；

The optical time delay unit includes by the sequentially connected N number of smooth delay unit of multimode waveguide, and light delay unit includes more than one section Mould waveguide delay line and m optical mode switch, are delayed by the light beam that control switch state controls AD HOC from multimode waveguide Line passes through or bypass passes through, and light beam when passing through from delay line waveguide is made delay process, from the light beam that passes through of bypass not by Make delay process；

The optical mode demultiplexer, for by the modal cutoff in optical time delay unit output beam and being converted into base from higher order mode Mould output.

2. the reconfigurable optical delay line system of mode multiplexing according to claim 1, which is characterized in that the optical mode is opened Closing tool, there are two types of working conditions: bypass state and pass-through state；Under the pass-through state, the light beam of all modes of entrance enters Next optical mode switch or multimode waveguide delay line；Under bypass state, the light beam of a certain AD HOC bypasses output, other modes Light beam enter next optical mode switch or multimode waveguide delay line.

3. the reconfigurable optical delay line system of one mode as claimed in claim 1 or 2 multiplexing, it is characterized in that, described more Multimode waveguide delay line length in a light delay unit is Geometric Sequence relationship.