# US 2017/0285442 A1 · Optical clock generator

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- Number: US 2017/0285442 A1
- Document ID: US20170285442A1
- Status: Published application
- Kind: A1
- Application number: 15/626,209
- Filed: 2017-06-19
- Published: 2017-10-05
- Earliest claimed: 2014-12-19
- Assignees: Zhengbiao Ouyang
- Inventors: Zhengbiao Ouyang; Quanqiang Yu
- Web page: https://patentgrep.com/patent/US20170285442A1

## CPC

- G02F 3/00: Optical logic elements; Optical bistable devices
- G02B 6/1225: {comprising photonic band-gap structures or photonic lattices}
- G02F 1/3501: {Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals}
- G02F 2201/06: integrated waveguide
- G02F 2202/32: Photonic crystals
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

An optical clock generator includes a nonlinear cavity unit, a cross-waveguide logic gate unit and a delayer unit; and is of a six-port photonic crystal structure including two reference-light signal-input ports, a feedback-signal-input port, a system-signal and feedback-signal output port and two idle ports; the output port of the cross-waveguide logic gate unit is connected with the input port of the nonlinear cavity unit whose system-signal output port is connected with the input port of said delayer unit whose output port is connected with the input port of the cross-waveguide logic gate unit, the system-signal output port is connected with a two-branch waveguide one of which is used as the system-signal output port, and another is used as the feedback-signal output port and connected to an input port of said delayer unit, the delayer unit performs time delay on an input signal and outputs the signal to the feedback-signal-input port.

## Claims

### Claim 1

An optical clock generator, wherein said optical clock generator, comprising a nonlinear cavity unit, a cross-waveguide logic gate unit and a delayer unit; said optical clock generator is of a six-port optical crystal structure, and including of two reference-light-signal input ports, a feedback-signal input port, a system signal and feedback-signal output port and two idle ports; the output port of said cross-waveguide logic gate unit is connected with the input port of said nonlinear cavity unit, and the system-signal output port of said nonlinear cavity unit is connected with the input port of said delayer unit; and the output port of the delayer unit is connected with the input port of the cross-waveguide logic gate unit, the system-signal output port is connected with a two-branch waveguide, one port of the two-branch waveguide is used as said system-signal output port, and another port is used as said feedback-signal output port and connected to an input port of said delayer unit, said delayer unit performs time delay on an input signal and outputs the signal to the feedback-signal input port.

### Claim 2 (depends on 1)

The optical clock generator according to claim 1, wherein said the signal input port of the nonlinear cavity unit is connected with the output port of the cross-waveguide logic gate unit.

### Claim 3 (depends on 1)

The optical clock generator according to claim 1, wherein said nonlinear cavity unit is a two-dimensional (2D) photonic crystal (PhC) cross-waveguide nonlinear cavity and is a 2DPhC cross-waveguide four-port network formed by high-refractive-index dielectric pillars, the four-port network has a four-port PhC structure, a left port of the four-port network is the reference-light input port, a lower port is an intermediate. signal input port, an upper port is the system-signal output port, and a right port is the idle port; two mutually-orthogonal quasi one-dimensional (1D) PhC structures are placed in two waveguide directions crossed at a center of the across waveguide; a dielectric cylinder is arranged in the middle said cross waveguide, said dielectric cylinder is made of a nonlinear material, and the cross section of said dielectric cylinder is square, polygonal, circular or oval; the dielectric constant of a rectangular linear pillar clinging to a central nonlinear pillar and close to the signal output end is equal to that of the central dielectric cylinder under low-light-power conditions; said quasi-1DPhC structures and said dielectric cylinder constitute a waveguide defect cavity.

### Claim 4 (depends on 1)

The optical clock generator according to claim 1, wherein said cross-waveguide logic gate unit is said cross-waveguide PhC optical “OR”, “NOT” and “XOR” logic gate.

### Claim 5 (depends on 1)

The optical clock generator according to claim 1, wherein said cross-waveguide logic gate unit is a PhC structure of the four-port waveguide network, the right port of the four-port network is the reference-light input port, the lower end is the signal input port, the upper port is the intermediate signal output port, and the left port is the idle port; a circular dielectric pillar is arranged in the center of said cross waveguide of said four-port network, “NON” logic of all-optical signals can be performed by setting different input ports.

### Claim 6 (depends on 3)

The optical clock generator according to claim 3, wherein said the cross section of the dielectric pillar in the quasi-1DPhC of the cross waveguide is rectangular, circular or polygonal, and the refractive index of the dielectric pillar is 3.4 or a different value more than 2.

### Claim 7 (depends on 3)

The optical clock generator according to claim 3, wherein said high-refractive-index linear-dielectric pillar of the 2DPhC and has a cross section of circular, polygonal, triangle or oval.

### Claim 8 (depends on 3)

The optical clock generator according to claim 3, wherein said The background filling material for forming said 2D PhC is air or a different low-refractive-index medium having the refractive index lower than 1.4.

### Claim 9 (depends on 3)

The optical clock generator according to claim 3, wherein said 2D PhC is a (2m+1)×(2n+1) array structure, where m is an integer more than or equal to 5, and n is an integer more than or equal to 8.