Programmable multipurpose sparse wavelength division multiplexer

Abstract

The invention relates to a programmable multipurpose sparse wavelength division multiplexer which comprises a first-stage filter and a second-stage filter, the second-stage filter comprises a plurality of filtering units arranged in parallel, the connecting end of the first-stage filter is coupled with the connecting end of each filtering unit, and the connecting end of the second-stage filter is coupled with the connecting end of each filtering unit. A bidirectional transmission path of an optical signal is formed between the channel end of the first-stage filter and the channel end of the second-stage filter; the optical amplitude and phase regulation and control elements in the first-stage filter and the second-stage filter are configured through electric signals, and programmable adjustment of the wavelength division multiplexer is achieved. According to the invention, the programmability of the photon integrated circuit can be effectively realized, and the application depth of the current on-chip optical system is greatly increased. By flexibly adjusting the target parameters of the optical chip, scenes of multi-target on-chip optical communication, high-performance calculation and the like can be realized.

Description

Technical Field

[0001] This invention relates to the fields of photonic integrated circuits and wavelength division multiplexers, and in particular to a programmable multipurpose sparse wavelength division multiplexer. Background Technology

[0002] Traditional photonic integrated circuits use single devices, which are only suitable for unidirectional applications and can generally only achieve a predetermined function. However, such photonic systems have a very narrow range of applications and are easily affected by process errors and temperature changes, leading to performance degradation or failure of photonic circuits. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a programmable multipurpose sparse wavelength division multiplexer that can flexibly adjust the target parameters of optical chips, thereby realizing the programmability of photonic integrated circuits and increasing the application depth of current on-chip optical systems.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: a programmable multi-purpose sparse wavelength division multiplexer is provided, including a first-stage filter and a second-stage filter. The second-stage filter includes several parallel filtering units. The connection terminal of the first-stage filter is coupled to the connection terminal of each of the filtering units, so that a bidirectional transmission path for optical signals is formed between the channel terminal of the first-stage filter and the channel terminal of the second-stage filter. The amplitude and phase modulation elements in the first-stage filter and the second-stage filter are configured by electrical signals to realize the programmable adjustment of the wavelength division multiplexer.

[0005] Furthermore, the optical amplitude and phase modulation element includes a phase shifter and a power divider. The power divider adjusts the coupling coefficient through two electrical signal configuration ports, and the phase shifter adjusts the delay line phase compensation through two electrical signal configuration ports.

[0006] Furthermore, the first-stage filter includes a plurality of phase shifters and power dividers arranged alternately along its channel end to its connection end, and the first amplitude phase modulation element starting from its connection end is a power divider.

[0007] Furthermore, the first-stage filter includes three phase shifters with delay line lengths of 28.9 μm, 57.9 μm, and 58.1 μm, respectively.

[0008] Furthermore, each of the filtering units includes a plurality of phase shifters and power dividers arranged alternately along its connection end to its channel end, and the first optical amplitude phase control element starting from its connection end and the first optical amplitude phase control element starting from its channel end are both power dividers.

[0009] Furthermore, each of the filtering units includes a first power divider, a first phase shifter, a second power divider, a second phase shifter, and a third power divider sequentially coupled along its connection end to its channel end, and the phase adjustment direction of the first phase shifter is opposite to that of the second phase shifter.

[0010] Furthermore, the plurality of parallel filtering units include a first filtering unit and a second filtering unit, wherein one of the electrical signal configuration ports of the first power divider of the first filtering unit and one of the electrical signal configuration ports of the first phase shifter of the second filtering unit are connected to the same configuration electrical signal.

[0011] Furthermore, in the second filtering unit, one of the electrical signal configuration ports of the second power divider, one of the electrical signal configuration ports of the second phase shifter, and one of the electrical signal configuration ports of the third power divider are connected to the same configuration electrical signal.

[0012] Furthermore, the delay line lengths of the first phase shifter and the second phase shifter of the first filter unit are 7.6 μm and 15.2 μm, respectively; the delay line lengths of the first phase shifter and the second phase shifter of the second filter unit are 6.7 μm and 13.4 μm, respectively.

[0013] Beneficial effects

[0014] Due to the adoption of the above-mentioned technical solutions, this invention has the following advantages and positive effects compared with the prior art: This invention uses a power divider and phase shifter with a large tuning range to realize the programmability of photonic integrated circuits. By flexibly adjusting the target parameters of the optical chip, the application depth of current on-chip optical systems can be greatly increased, realizing multi-target on-chip optical communication, high-performance computing and other application scenarios; This invention can also be extended to other material systems, such as thin-film lithium niobate, silicon nitride, indium phosphide and other systems; In addition, through electrical signal programming, it can be applied to the functional reconfiguration of 2-channel optical switches, as well as multiplexers or filters for higher wavelength channels. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a preferred embodiment 1 of the present invention;

[0016] Figure 2 This is the spectral response diagram of the multiplexer with an FSR of 40 nm in preferred embodiment 1 of the present invention;

[0017] Figure 3 This is the reconstruction diagram of the multiplexer FSR and the center wavelength achieved by electrical signal control in the preferred embodiment 1 of the present invention;

[0018] Figure 4 This is the spectral response diagram of a multiplexer with an FSR of 20 nm after being programmed by electrical signals in the preferred embodiment of the present invention. Detailed Implementation

[0019] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0020] This invention relates to a programmable, multi-purpose sparse wavelength division multiplexer (WDM), comprising a first-stage filter and a second-stage filter. The second-stage filter includes two parallel filtering units. The connection terminals of the first-stage filter are coupled to the connection terminals of the two filtering units, forming a bidirectional optical signal transmission path between the channel terminals of the first-stage filter and the channel terminals of the second-stage filter. The amplitude and phase modulation elements in the first-stage and second-stage filters are configured via electrical signals to achieve programmable adjustment of the WDM.

[0021] More specifically, the optical amplitude and phase modulation elements include a phase shifter and a power divider, which have dynamic tuning capabilities. The power divider adjusts the coupling coefficient through two electrical signal configuration ports, while the phase shifter adjusts the delay line phase compensation through two electrical signal configuration ports.

[0022] The first-stage filter and two filter units in the wavelength division multiplexer consist of several phase shifters and power dividers arranged alternately along its channel end to its connection end, and the first optical amplitude phase control element starting from its connection end is a power divider.

[0023] like Figure 1 As shown, this is a preferred embodiment 1 of the present invention. The photonic integrated circuit can be used to realize multi-channel wavelength division multiplexing without different free spectrum regions and channel wavelengths.

[0024] This programmable wavelength division multiplexer (WDM) mainly consists of tunable power dividers and phase shifters. Taking a 4-channel WDM as an example, it comprises two stages of filters. The first stage filter mainly consists of four power dividers and three phase shifters. The second stage filter consists of two parts, the upper filter denoted as 2a and the lower filter denoted as 2b.

[0025] Along its connection end to its channel end, the power divider and phase shifter of filter 2a and filter 2b are denoted as the first power divider, the first phase shifter, the second power divider, the second phase shifter and the third power divider, and the phase adjustment direction of the first phase shifter is opposite to that of the second phase shifter.

[0026] Preferably, one of the electrical signal configuration ports of the first power divider in the first filtering unit and one of the electrical signal configuration ports of the first phase shifter in the second filtering unit can be connected to the same configuration electrical signal. Alternatively, one of the electrical signal configuration ports of the second power divider, one of the electrical signal configuration ports of the second phase shifter, and one of the electrical signal configuration ports of the third power divider in the second filtering unit can be connected to the same configuration electrical signal.

[0027] In the first-stage filter, the coupling coefficients K1, K2, K3, and K4 of the power divider are 0.5, 0.17, 0.22, and 0.02, respectively, and the delay line lengths are 28.9 μm, 57.9 μm, and 58.1 μm, respectively.

[0028] In the second-stage filter, the coupling coefficients K5, K6, and K7 of filter 2a are 0.5, 0.28, and 0.08, respectively, and the lengths of the delay sections are 7.6 μm and 15.2 μm, respectively; the coupling coefficients of filter 2b are the same as those of filter 2a, and the lengths of the delay sections are 6.7 μm and 13.4 μm, respectively.

[0029] With this initial configuration, the spectral response of this 4-channel wavelength division multiplexer is as follows: Figure 2 As shown, a 40nm FSR was achieved, with channel center wavelengths of 1511nm, 1531nm, 1551nm, and 1571nm.

[0030] By employing a power divider and phase shifter with a wide range of dynamic tuning, this multichannel wavelength division multiplexer is programmable to enable various filtering applications.

[0031] like Figure 3 As shown, by changing the core components of this programmable photonic system, the FSR of the multiplexer can be changed from 40nm to 20nm, the center wavelength can be shifted from 1531nm to 1545nm, and the bandwidth and channel crosstalk can be optimized by fine-tuning the unit devices.

[0032] The coupling coefficients of the first-stage filter were adjusted to 0.5, 0.18, 0.21, and 0.02, and the delay line phase compensation was adjusted to 0.2π, 0.4π, and 0.4π.

[0033] Adjust the coupling coefficients of filter 2a to 0.5, 0.29, and 0.09, and the delay line phase compensation to 1.4π and 0.8π; adjust the coupling coefficients of filter 2b to 0.5, 0.26, and 0.21, and the delay line phase compensation to 0.7π and 1.7π.

[0034] Controlled by electrical signals, this multiplexer can adjust the FSR from 40nm to 20nm, while simultaneously reconstructing the channel center wavelength to 1525nm, 1535nm, 1545nm, and 1555nm. For example... Figure 4 The image shows the spectral response of the programmed multiplexer, which has a 1dB bandwidth greater than 8nm and channel crosstalk less than -22dB.

Claims

1. A programmable, multi-purpose sparse wavelength division multiplexer, characterized in that, The system includes a first-stage filter and a second-stage filter. The second-stage filter includes several parallel filtering units. The connection terminals of the first-stage filter are coupled to the connection terminals of each of the filtering units, so that a bidirectional transmission path for optical signals is formed between the channel terminals of the first-stage filter and the channel terminals of the second-stage filter. The amplitude and phase modulation elements in the first-stage filter and the second-stage filter are configured by electrical signals to realize programmable adjustment of the wavelength division multiplexer.

2. The wavelength division multiplexer according to claim 1, characterized in that, The optical amplitude and phase modulation element includes a phase shifter and a power divider. The power divider adjusts the coupling coefficient through two electrical signal configuration ports, and the phase shifter adjusts the delay line phase compensation through two electrical signal configuration ports.

3. The wavelength division multiplexer according to claim 2, characterized in that, The first-stage filter includes a plurality of phase shifters and power dividers arranged alternately along its channel end to its connection end, and the first amplitude-phase modulation element starting from its connection end is a power divider.

4. The wavelength division multiplexer according to claim 3, characterized in that, The first-stage filter includes three phase shifters with delay line lengths of 28.9 μm, 57.9 μm, and 58.1 μm, respectively.

5. The wavelength division multiplexer according to claim 3, characterized in that, Each of the filter units includes a plurality of phase shifters and power dividers arranged alternately along its connection end to its channel end, and the first optical amplitude phase control element starting at its connection end and the first optical amplitude phase control element starting at its channel end are both power dividers.

6. The wavelength division multiplexer according to claim 5, characterized in that, Each of the filter units includes a first power divider, a first phase shifter, a second power divider, a second phase shifter, and a third power divider sequentially coupled from its connection end to its channel end, wherein the phase adjustment direction of the first phase shifter is opposite to that of the second phase shifter.

7. The wavelength division multiplexer according to claim 6, characterized in that, The plurality of parallel filtering units include a first filtering unit and a second filtering unit. One of the electrical signal configuration ports of the first power divider of the first filtering unit and one of the electrical signal configuration ports of the first phase shifter of the second filtering unit are connected to the same configuration electrical signal.

8. The wavelength division multiplexer according to claim 7, characterized in that, In the second filtering unit, one of the electrical signal configuration ports of the second power divider, one of the electrical signal configuration ports of the second phase shifter, and one of the electrical signal configuration ports of the third power divider are connected to the same configuration electrical signal.

9. The wavelength division multiplexer according to claim 7, characterized in that, The delay line lengths of the first phase shifter and the second phase shifter in the first filter unit are 7.6 μm and 15.2 μm, respectively; the delay line lengths of the first phase shifter and the second phase shifter in the second filter unit are 6.7 μm and 13.4 μm, respectively.

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