Optical modulator and optical transmission device using same

A light modulator and light modulating technology, which is applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of leaking microwave, leaking microwave 2290, and installation position deviation, etc., and achieve good modulation characteristics and the effect of suppressing electrical noise

Pending Publication Date: 2022-05-10
SUMITOMO OSAKA CEMENT CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] However, the above-mentioned component mounting portion 2250 may cause the high-frequency (microwave) propagating through the signal conductor pattern 2230 due to, for example, a difference in the physical shape of the circuit element and the signal conductor pattern 2230, or a deviation in the mounting position of the circuit element. disordered electrical signaling
As a result, a part of the above-mentioned microwave electric signal leaks from the component mounting part 2250, and becomes a leaked microwave 2290 ( Figure 14 ), for the adjacent signal conductor pattern 2230 and the signal electrode 2212 on the light modulation element 2202, it may act as noise
[0018] In addition, as described above, in the above-mentioned structure in which the component mounting portions 2250 are arranged at approximately the same interval and facing the same direction, the leaked microwaves leaking from each component mounting portion 2250 may have a direction substantially facing each other. Directional transmission in the same direction
Moreover, in the case of an optical modulator that generates two beams of modulated light modulated by a pair of high-frequency electrical signals, such as a DP-QPSK optical modulator, not only does the above-mentioned high-frequency signal change between the paired high-frequency electrical signals The phases are substantially the same, and different pairs also have substantially the same high-frequency components, so leaked microwaves with substantially the same phase and frequency components may be radiated from the component mounting portion 2250
[0019] As a result, the leaked microwaves strongly interfere with each other, and a new problem that has not been thought of in the conventional 100 Gb / s transmission will occur as follows: For the signal electrode 2212 of the surrounding signal conductor pattern 2230 and the optical modulation element 2202 connected thereto Electrical noise comes into play
In addition, when a part of the signal conductor pattern 2230 is recoupled from the leaked microwave generated from the component mounting part 2250 constituting the electric filter to its own signal conductor pattern 2230 and the signal electrode 2212 of the optical modulation element 2202 connected thereto, not only Acts as electrical noise, and also causes additional problems such as deterioration or change of the filter characteristics of the above-mentioned electrical filter

Method used

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  • Optical modulator and optical transmission device using same
  • Optical modulator and optical transmission device using same
  • Optical modulator and optical transmission device using same

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no. 1 approach

[0059] First, a first embodiment of the present invention will be described. figure 1 is a plan view showing the configuration of the optical modulator 100 according to the first embodiment of the present invention, figure 2 is a side view of the light modulator 100, image 3 yes figure 1 Partial detail view of part A in .

[0060] The light modulator 100 includes a light modulation element 102, a case 104 for accommodating the light modulation element 102, an input optical fiber 108 for making light incident on the light modulation element 102, and a light output from the light modulation element 102 to the outside of the case 104. Guided output fiber 110 .

[0061] The optical modulation element 102 is a DP-QPSK modulator for optical modulation of, for example, 400 Gb / s, and is composed of two nested Mach-Zehnder optical waveguides disposed on, for example, an LN substrate, each nested Mach-Zehnder The optical waveguides respectively include two Mach-Zehnder type opti...

no. 2 approach

[0132] Next, an optical modulator according to a second embodiment of the present invention will be described. In the above-mentioned optical modulator 100 of the first embodiment, the arrangement pitch of the signal electrodes 112 of the light modulation element 102 is equal to the arrangement pitch of the signal input terminals 124 , but the present invention is not limited thereto. The arrangement pitch of the signal electrodes of the light modulation element may be larger than the arrangement pitch of the signal input terminals 124 , or may be smaller than the arrangement pitch of the signal input terminals 124 . This embodiment is the first example in which the arrangement pitch of the signal electrodes of the optical modulation element is smaller than the arrangement pitch of the signal input terminals 124 .

[0133] Figure 8 is a plan view showing the configuration of the light modulator 800 according to the second embodiment of the present invention, Figure 9 yes ...

no. 3 approach

[0153] Next, an optical modulator according to a third embodiment of the present invention will be described. In the interposer substrates 118 , 418 , 518 , 618 , and 718 of the above-mentioned first embodiment and its modifications, and the interposer substrate 918 of the second embodiment, the signal conductor pattern 330 and the like and 940 are configured as shapes including bends. , but, of course, the present invention is not limited to such a bent shape. These signal conductor patterns 330 and 940 may be formed using curves instead of bending.

[0154] This embodiment is a second example in which the arrangement pitch of the signal electrodes of the optical modulation element is smaller than the arrangement pitch of the signal input terminals 124. In particular, as will be described later, the signal conductor patterns 1130a, 1130b, 1130c, and 1130d of the relay substrate 1018 The curved portion is formed of a curved line without being bent.

[0155] Figure 10 is a ...

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Abstract

In an optical modulator in which a circuit element is provided on a relay substrate, the influence of leaked microwaves generated from the relay substrate is reduced and good modulation characteristics are achieved. An optical modulator (100) is provided with: an optical modulation element (102) provided with a plurality of signal electrodes (112a-112d), the optical modulation element (102) being configured so as to generate two beams of modulated light each modulated by two sets of electrical signals, each set of electrical signals including two electrical signals; a plurality of signal input terminals (124a-124d) for inputting an electric signal; a relay substrate (618) on which a plurality of signal conductor patterns (630a-630d) and a plurality of ground conductor patterns (640a-640d) are formed, the relay substrate (618) transmitting two sets of electrical signals through two pairs of adjacent signal conductor patterns; and a housing (104), in the optical modulator (100), at least two signal conductor patterns provided with at least one component mounting portion including the circuit components (350a-350d) are configured such that first signal transmission directions, which are signal transmission directions at the component mounting portion, are different from each other.

Description

technical field [0001] The present invention relates to an optical modulator including a relay substrate for relaying transmission of an electrical signal between a signal input terminal and a signal electrode of an optical modulation element, and an optical transmission device using the optical modulator. . Background technique [0002] In a high-speed / large-capacity optical fiber communication system, an optical modulator incorporating a waveguide-type optical modulation element is frequently used. Among them, LiNbO with photoelectric effect 3 (Hereinbelow, also referred to as LN) The light modulation element used for the substrate can realize light modulation characteristics with little loss of light and broadband, and thus is widely used in high-speed / large-capacity optical fiber communication systems. [0003] In this optical modulation element using an LN substrate, a Mach-Zehnder type optical waveguide and a signal electrode for applying a high-frequency electrical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/03G02F1/035
CPCG02F1/0305G02F1/035G02F1/0344G02F1/03G02F1/0115G02F1/0327G02F1/0316
Inventor 宫崎德一菅又彻
Owner SUMITOMO OSAKA CEMENT CO LTD
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