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JP-7854870-B2 - Optical device and method for determining correction parameters of the optical device

JP7854870B2JP 7854870 B2JP7854870 B2JP 7854870B2JP-7854870-B2

Inventors

  • 征矢 直記
  • 高橋 慶
  • 上村 和孝
  • 三浦 健輔

Assignees

  • 古河電気工業株式会社

Dates

Publication Date
20260507
Application Date
20220621

Claims (18)

  1. A circuit board having an insulator and multiple signal lines, A semiconductor integrated circuit provided on the circuit board, A plurality of optical transceivers provided on the circuit board and transmitting electrical signals to the semiconductor integrated circuit via separate signal wiring, A correction unit for correcting the signal transmission eye pattern in each of the aforementioned signal wirings, the correction unit being capable of changing the degree of correction according to a correction parameter, Equipped with, In the search process for finding a correction parameter that satisfies a predetermined condition by changing the correction parameter so that the discrepancy between the eye pattern acquired for each of the signal lines and the eye pattern that satisfies a predetermined condition is reduced, the initial value of the correction parameter can be set to a different value for each of the signal lines . An optical device in which, in the search process for each of the signal lines, the initial value is determined based on the correction parameter obtained by the search process for the other signal lines .
  2. The aforementioned multiple signal lines are grouped into multiple groups, The optical device according to claim 1 , wherein in the search process for each of the signal lines, the initial value is determined based on the correction parameter obtained by the search process for other signal lines belonging to the same group.
  3. A circuit board having an insulator and multiple signal lines, A semiconductor integrated circuit provided on the circuit board, A plurality of optical transceivers provided on the circuit board and transmitting electrical signals to the semiconductor integrated circuit via separate signal wiring, A correction unit for correcting the signal transmission eye pattern in each of the aforementioned signal wirings, the correction unit being capable of changing the degree of correction according to a correction parameter, Equipped with, In the search process for finding a correction parameter that satisfies a predetermined condition by changing the correction parameter so that the discrepancy between the eye pattern acquired for each of the signal lines and the eye pattern that satisfies a predetermined condition is reduced, the initial value of the correction parameter can be set to a different value for each of the signal lines. The aforementioned multiple signal lines are grouped into multiple groups, In the search process for each of the signal lines, the initial value is set for each group of optical devices.
  4. The optical device according to claim 2 or 3 , wherein the plurality of groups are set according to the length of the signal wiring.
  5. The circuit board has a plurality of signal lines that pass through different layers in the thickness direction of the circuit board as signal lines. The optical device according to claim 2 or 3 , wherein each of the groups includes the signal wiring having a section passing through the same hierarchy.
  6. The optical device according to claim 2 or 3 , wherein the plurality of groups are set according to the mounting positions on the circuit board of the optical transceiver that transmits electrical signals to the semiconductor integrated circuit via the signal wiring.
  7. The optical device according to claim 2 or 3 , wherein the initial value of the correction parameter is set according to the correction parameter set in the plurality of signal wiring of other individuals of the optical device having the same structure.
  8. The optical device according to claim 1, comprising: a search processing unit that performs a search process to search for a correction parameter that satisfies a predetermined condition by changing the correction parameter so that the discrepancy between the eye pattern acquired for each of the signal lines and the eye pattern that satisfies a predetermined condition is reduced.
  9. The optical device according to claim 1, comprising a plurality of search processing units capable of executing search processing for different signal wirings in parallel, each of which performs search processing for different signal wirings, by changing the correction parameter to reduce the discrepancy between the eye pattern acquired for each of the signal wirings and the eye pattern that satisfies the predetermined conditions.
  10. The optical device according to any one of claims 1, 3, and 9, wherein the optical device is further comprising a plurality of search processing units capable of performing a search process to search for a different correction parameter, each of which is a search processing unit that performs a search process to search for a correction parameter that satisfies a predetermined condition by changing the correction parameter so that the discrepancy between the eye pattern acquired for each of the signal wirings and the eye pattern that satisfies a predetermined condition is reduced.
  11. The optical device according to claim 8 , wherein the search processing unit comprises a first search processing unit provided in the semiconductor integrated circuit.
  12. The optical device according to claim 8 or 11 , further comprising a second search processing unit provided in each of the optical transceivers as the search processing unit.
  13. The optical device according to any one of claims 1, 3, and 8, further comprising a first correction unit that performs at least one enhancement process from a first enhancement process that expands the aperture before a reference time of the eye pattern, a second enhancement process that expands the aperture after a reference time of the eye pattern, and a third enhancement process that expands the aperture when the signal is continuous regardless of whether it is before or after the reference time.
  14. The optical device according to any one of claims 1, 3, and 8, further comprising a second correction unit which is at least one of a gain correction unit and a peaking processing unit as the correction unit.
  15. A circuit board having an insulator and multiple signal lines, A semiconductor integrated circuit provided on the circuit board, A plurality of optical transceivers provided on the circuit board and transmitting electrical signals to the semiconductor integrated circuit via separate signal wiring, A correction unit for correcting the signal transmission eye pattern in each of the aforementioned signal wirings, the correction unit being capable of changing the degree of correction according to a correction parameter, Equipped with, In the search process for finding a correction parameter that satisfies a predetermined condition by changing the correction parameter so that the discrepancy between the eye pattern acquired for each of the signal lines and the eye pattern that satisfies a predetermined condition is reduced, the initial value of the correction parameter can be set to a different value for each of the signal lines. The optical transceiver is an optical device comprising: a light-emitting unit that outputs an optical signal in response to an electrical signal from the semiconductor integrated circuit; a light-receiving unit that receives the optical signal and outputs an electrical signal to the semiconductor integrated circuit in response to the optical signal; and a transmission path that transmits the optical signal from the light-emitting unit to the light-receiving unit.
  16. The optical device according to claim 15, further comprising a search processing unit that performs a search process to search for a correction parameter that satisfies a predetermined condition by changing the correction parameter so that the discrepancy between the eye pattern acquired for each of the signal wirings and the eye pattern that satisfies a predetermined condition is reduced.
  17. An acquisition unit that acquires the eye pattern for each of the aforementioned signal lines, A signal transmission unit transmits between the optical device and the device an output signal based on the acquisition results of the acquisition unit, and an input signal from a search processing unit that performs a search process to search for correction parameters that satisfy predetermined conditions by changing the correction parameters so as to reduce the discrepancy between the eye pattern acquired for each of the signal wirings based on the output signal provided in a device different from the optical device and the eye pattern that satisfies predetermined conditions. An optical device according to any one of claims 1, 3, and 15, comprising the above.
  18. A method for setting the correction parameter in an optical device according to any one of claims 1, 3, and 15 , A method for setting correction parameters for an optical device, wherein the initial value of the correction parameter in a search process for finding a correction parameter that satisfies predetermined conditions is set to a different value for each of the signal lines, by changing the correction parameter so that the discrepancy between the eye pattern acquired for each of the signal lines and the eye pattern that satisfies predetermined conditions is reduced.

Description

This invention relates to an optical device and a method for determining correction parameters of an optical device. Conventionally, optical devices equipped with compact optical transceivers have been known as optical devices used in network switch devices (for example, Patent Document 1). Japanese Patent Publication No. 2020-027147 Figure 1 is an exemplary and schematic plan view of an optical communication device equipped with a switch device as an optical device in the first embodiment.Figure 2 is an illustrative and schematic plan view of the switch device according to the first embodiment.Figure 3 is an exemplary and schematic plan view of a part of the switch device of the first embodiment.Figure 4 is a partial exemplary and schematic cross-sectional view including the signal wiring of the switch device of the first embodiment.Figure 5 is a different, more illustrative and schematic cross-sectional view from Figure 4, showing the signal wiring of the switch device of the first embodiment.Figure 6 is an illustrative diagram illustrating the eye pattern correction process performed by the switch device of the first embodiment.Figure 7 is an illustrative block diagram of a switch device according to the first embodiment.Figure 8 is an exemplary flowchart showing the procedure of the search process by the switch device of the first embodiment.Figure 9 is an illustrative block diagram of a switch device according to the second embodiment.Figure 10 is an exemplary block diagram of a switch device according to the third embodiment.Figure 11 is an exemplary schematic diagram of a correction parameter determination system including a switch device according to the fourth embodiment. The following describes exemplary embodiments of the present invention. The configurations of the embodiments shown below, as well as the actions and results (effects) brought about by them, are examples only. The present invention can also be realized by configurations other than those disclosed in the following embodiments. Furthermore, according to the present invention, it is possible to obtain at least one of the various effects (including derived effects) that can be obtained by the configuration. The following embodiments share similar configurations. Therefore, the configurations of each embodiment yield similar functions and effects based on those similar configurations. Furthermore, similar components are denoted by the same reference numerals, and redundant explanations may be omitted. In this specification, ordinal numbers are assigned for convenience to distinguish directions, parts, sections, specifications, partial structures, etc., and do not indicate priority or order. In each figure, the X direction is represented by arrow X, the Y direction by arrow Y, and the Z direction by arrow Z. The X, Y, and Z directions intersect and are also orthogonal to each other. The Z direction may also be referred to as the layering direction or thickness direction. Furthermore, each diagram is a schematic representation for explanatory purposes, and the scale and proportions may not necessarily match those of the actual object. [First Embodiment] Figure 1 is a plan view of the optical communication device 200 according to the first embodiment. As shown in Figure 1, the optical communication device 200 includes a motherboard 201, an IC 202, and a plurality of switch devices 100. In addition to these, the optical communication device 200 may also include a power supply module, a cooling fan, etc. (not shown). The motherboard 201 has a substantially constant thickness in the Z direction and extends in a direction that intersects with the Z direction. The motherboard 201 has two surfaces: surface 201a and surface 201b. Surface 201a faces and intersects with the Z direction. Surface 201b faces the opposite direction from surface 201a and intersects with the Z direction. Multiple switch devices 100 are mounted on surface 201a, and IC 202 is mounted on surface 201b. Note that IC 202 may also be mounted on surface 201a. IC 202 controls the operation of multiple switch devices 100 and transmits electrical signals between these switch devices 100. IC 202 is an example of a signal processing circuit. The conductor (not shown) of the motherboard 201 and the conductor (not shown) of the switch device 100 are electrically connected via the conductor (not shown) within the connector. Figure 2 is a plan view of the switch device 100. As shown in Figure 2, the switch device 100 comprises a circuit board 10, a plurality of optical transceivers 20, and a switch ASIC 30 (ASIC: application specific integrated circuit). The optical transceivers 20 and the switch ASIC 30 may also be referred to as electronic components. The switch device 100 has a board assembly configuration comprising the circuit board 10 and the electronic components. The switch device 100 may also be referred to as an optical device. The circuit board 10 has a square (quadrilateral)