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Optical modulator

A technology of optical modulators and modulators, which is applied in the direction of instruments, optics, light guides, etc., can solve problems such as unbalanced, difficult to use and eliminate, and achieve the effect of suppressing the degradation of modulation characteristics and excellent modulation characteristics

Inactive Publication Date: 2011-08-17
SUMITOMO OSAKA CEMENT CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In addition, in the case of the FSK modulator, a sine wave is applied to the interferometer of the sub-MZ waveguide in order to generate two frequency shift keying, so similar to DQPSK, it is difficult to use it to eliminate the imbalance itself

Method used

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  • Optical modulator
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Embodiment Construction

[0045] Hereinafter, the preferred examples are described in detail Figures 1 to 5 The invention shown.

[0046]An optical modulator 1 of the present invention includes: a substrate 4 having an electro-optic effect; an optical waveguide 5 formed on the substrate; and control electrodes 61-65 used to control the light waves propagating in the optical waveguide, the The optical modulator 1 is characterized in that the optical waveguide 5 consists of a main Mach-Zehnder (MZ) waveguide 50 having two branch waveguides and a secondary Mach-Zehnder (MZ) waveguide 51 arranged on the branch waveguides, 52, each branch waveguide is provided with a light intensity adjustment mechanism (for example, composed of optical waveguides 53, 54 and control electrodes 63, 64) in series with the sub-MZ waveguides 51, 52.

[0047] As the substrate 4 having an electro-optic effect, lithium niobate, lithium tantalate, PLZT (lead lanthanum zirconate titanate), quartz-based materials, and the like can ...

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Abstract

Provided is an optical modulator such as a DQPSK modulator or an FSK modulator for generating a multilevel phase modulation signal, which has a high signal quality, and particularly which has high performance and can suppress degradation in modulation characteristic due to the intensity difference between signal components caused by optical modulator manufacturing variations and the like and improve the characteristic without a complicated manufacturing process. An optical modulator (1) comprising a substrate (4) having an electro-optic effect, an optical waveguide (5) formed on the substrate, and control electrodes (61-65) for controlling optical waves propagating through the optical waveguide is characterized in that the optical waveguide (5) is configured from a main Mach-Zehnder (MZ) waveguide (50) comprising two branch waveguides and sub Mach-Zehnder (MZ) waveguides (51, 52) provided in the branch waveguides, optical intensity adjusting means (for example, composed of optical waveguides (53, 54) and control electrodes (63, 64)) are provided in series with the sub Mach-Zehnder waveguides (51, 52) in the respective branch waveguides, and the optical modulator is provided with a voltage control circuit for monitoring part of optical waves propagating through the branch waveguides and adjusting voltages to be applied to the optical intensity adjusting means.

Description

technical field [0001] The present invention relates to an optical modulator, in particular to an optical modulator such as a DQPSK modulator or an FSK modulator that generates multilevel phase modulation signals. Background technique [0002] With the increase of communication traffic, the introduction of multi-value modulation, demodulation and coding technology is discussed in the second-generation long-distance and large-capacity optical communication system that requires high speed and large capacity. One of its representative methods is Differential Quadrature Phase Shift Keying (DQPSK, Differential Quadrature Phase Shift keying) method. In this method, compared with the conventional binary intensity modulation (OOK) method, the signal frequency band is narrower, and high sensitivity can be expected in addition to improving the frequency utilization efficiency and extending the transmission distance. [0003] As shown in Patent Document 1, the DQPSK modulator includes...

Claims

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Application Information

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IPC IPC(8): G02F1/035G02B6/42
CPCH04B10/5053H04B10/5561G02B6/4202G02B6/4214H04B10/5051G02F2001/212G02F1/2255H04B10/5563G02F1/212
Inventor 日隈薰市川润一郎
Owner SUMITOMO OSAKA CEMENT CO LTD
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