Silicon optoisolator

Abstract

The invention discloses a silicon optoisolator. The silicon optoisolator is that a first target waveguide section is used for performing non-reciprocal phase shifting for a second beam split signal while transmitting from a second branch of a first branch coupler to a second port of a first directional coupler; a second target waveguide section is used for performing non-reciprocal phase shifting for a first beam split signal while transmitting from a fourth port of the first directional coupler to the second port of a second directional coupler; a third target waveguide section is used for performing non-reciprocal phase shifting for the second beam split signal while transmitting from a third port of the first directional coupler to the first port of the second directional coupler; a fourth target waveguide section is used for performing non-reciprocal phase for the first beam split signal while transmitting from the third port of the second directional coupler to a reciprocal phase shifter; the reciprocal phase shifter is used for performing reciprocal phase shifting for the first beam split signal passing through the reciprocal phase shifter. With the adoption of the silicon optoisolator, the magnetic field distribution area can be effectively reduced, and thus the utilization efficiency of a magnetic field can be increased. The expression of phase shifting each time is shown in the specification.

Description

technical field [0001] The invention relates to the optical field, in particular to a silicon optical isolator. Background technique [0002] A silicon opto-isolator is a device that allows light to travel in a first direction and prohibits light from traveling in the direction opposite to the first direction. Silicon optical isolators are widely used in optical communications. For example, the optical signal generated from a semiconductor laser must be able to pass through the silicon optical isolator and then be sent to the receiving end (ie, the first direction), however, it is reflected back from the receiving end direction. The reflected light (that is, the opposite direction of the first direction) must be isolated by a silicon optical isolator to prevent the reflected light from deteriorating the oscillation characteristics of the semiconductor laser. [0003] refer to figure 1 , the prior art provides a silicon optical isolator 100 , including a substrate 110 , a w...

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Problems solved by technology

[0007] However, since the size of the non-reciprocal phase shift is proportional to the length of the waveguide section in the waveguide section of the non-reciprocal phase shifter, under existing technical conditions, the first split optical signal must obtain sufficient non-reciprocal phase shift through the waveguide section ef Easy phase shift and passing through the waveguide section e'f' make the second split signal obtain enough non-reciprocal phase shift, the magnetic field must be set large enough, and the utilization efficiency of the magnetic field is not high

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