Optical modulator
First Claim
1. An optical modulator comprising:
- a bottom Distributed Bragg Reflector (DBR) layer;
a top DBR layer comprising at least one layer, and a modified layer; and
an active layer disposed between the bottom and the top DBR layers and comprising multiple quantum wells (MQW),wherein the at least one layer comprises at least one pair of a first refractive index layer having a first refractive index and a second refractive index layer having a second refractive index, each of the first and the second refractive index layers having a first optical thickness of λ
/4 or an odd multiple thereof and the first and the second refractive indexes being different,wherein the modified layer comprises at least one pair of a third refractive index layer having a third refractive index and a fourth refractive index layer having a fourth refractive index, the third and the fourth refractive indexes being different, andwherein λ
is a center absorption wavelength in the active layer and at least one of the third and the fourth refractive index layers has a second optical thickness that is not λ
/4 or that is not an odd multiple thereof.
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Abstract
Optical modulator having wide bandwidth based on Fabry-Perot resonant reflection is disclosed. The optical modulator includes: a bottom Distributed Bragg Reflector (DBR) layer; a top DBR layer including at least one layer, and a modified layer; and an active layer disposed between bottom and top DBR layers, wherein the at least one layer includes at least one pair of a first refractive index layer having a first refractive index and a second refractive index layer having a second refractive index, the modified layer includes at least one pair of a third refractive index layer having a third refractive index and a fourth refractive index layer having a fourth refractive index, the third and the fourth refractive indexes being different, and at least one of the third and the fourth refractive index layers has a second optical thickness that is not λ/4 or that is not an odd multiple thereof.
29 Citations
29 Claims
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1. An optical modulator comprising:
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a bottom Distributed Bragg Reflector (DBR) layer; a top DBR layer comprising at least one layer, and a modified layer; and an active layer disposed between the bottom and the top DBR layers and comprising multiple quantum wells (MQW), wherein the at least one layer comprises at least one pair of a first refractive index layer having a first refractive index and a second refractive index layer having a second refractive index, each of the first and the second refractive index layers having a first optical thickness of λ
/4 or an odd multiple thereof and the first and the second refractive indexes being different,wherein the modified layer comprises at least one pair of a third refractive index layer having a third refractive index and a fourth refractive index layer having a fourth refractive index, the third and the fourth refractive indexes being different, and wherein λ
is a center absorption wavelength in the active layer and at least one of the third and the fourth refractive index layers has a second optical thickness that is not λ
/4 or that is not an odd multiple thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. An optical modulator comprising:
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an active layer comprising multiple quantum wells; a first Distributed Bragg Reflector (DBR) layer disposed to one side of the active layer; and a second DBR layer disposed to another side of the active layer, the second DBR layer being less reflective than the first DBR layer, wherein the second DBR layer comprises; a first layer comprising a plurality of first refractive index layers and a plurality of second refractive index layers, the plurality of first refractive index layers being alternatingly disposed with the plurality of second refractive index layers; a modified layer comprising at least one pair of layers; and a second layer comprising another plurality of the first refractive index layers and another plurality of second refractive index layers, the another plurality of first refractive index layers being alternatingly disposed with the another plurality of second refractive index layers; and wherein λ
is a center absorption wavelength in the active layer,wherein each of the plurality of first refractive index layers and each of the plurality of second refractive index layers has an optical thickness of λ
/4 or an odd multiple thereof, andwherein the at least one pair of layers of the modified layer has an optical thickness that is not λ
/4 or that is not an odd multiple thereof.
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Specification