Granted Patent B2

US 12,625,324 · App. 18/360,640 · Granted May 12, 2026

Inventors: Yongkang Hu (Fuzhou, CN); Ketang Tan (Fuzhou, CN)

Assignee: II-VI DELAWARE, INC.

G02B6/29395G02B6/29304G02B6/29313G02B6/29322G02B6/29361G02B6/29389

Abstract

Claims (43)

1 . An optical fiber filter, the optical fiber filter comprising:

a two-dimensional mechanical rotating mirror disposed in optical communication with at least one multi-wavelength optical signal input to the optical fiber filter, the two-dimensional mechanical rotating mirror being configured to rotate in two-dimensions and being configured to reflect the at least one multi-wavelength optical signal;

a collimating and beam expanding system disposed in optical communication with the at least one reflected multi-wavelength optical signal;

two gratings each disposed in optical communication with the collimating and beam expanding system and being configured to disperse the at least one reflected multi-wavelength optical signal into light of different wavelengths at different diffraction angles;

first reflection components correspondingly arranged on input ends of the two gratings; and

second reflection components correspondingly arranged on output ends of the two gratings,

wherein the two-dimensional mechanical rotating mirror is configured to select the light of at least one of the different diffraction angles as at least one filtered signal for output to at least one output optical fiber, and

wherein a first dimension of the two-dimensional mechanical rotating mirror is configured to tune a wavelength for the filtered signal; and wherein a second dimension is configured to switch between the two gratings to achieve an ultra-wide tuning range.

2 . The optical fiber filter of claim 1 , wherein the two gratings comprise a C-band grating and an L-band grating; and wherein the first dimension of the two-dimensional mechanical rotating mirror is configured to tune the wavelength for the filtered signal; and wherein the second dimension is configured to switch between the C-band and L-band gratings to achieve an ultra-wide tuning range in the entire C+L bands.

3 . The optical fiber filter of claim 1 , wherein the two-dimensional mechanical rotating mirror is configured to adjust power of the at least one filtered signal.

4 . The optical fiber filter of claim 1 , wherein at least one of the gratings comprise a multi-level cascade structure of gratings selected from the group consisting of transmissive gratings, reflective gratings, or a combination of transmissive gratings and reflective gratings.

5 . The optical fiber filter of claim 1 , wherein the two-dimensional mechanical rotating mirror includes an actuator to position the two-dimensional mechanical mirror in two dimensions.

6 . The optical fiber filter of claim 5 , further comprising a control circuitry that operates the actuator to position the two-dimensional mechanical mirror.

7 . The optical fiber filter of claim 1 , further comprising a single input optical fiber and a single output optical fiber.

8 . The optical fiber filter of claim 1 , further comprising:

an input optical fiber;

two output optical fibers, wherein the input optical fiber and the two output optical fibers are independent components;

first total reflection components correspondingly arranged on front ends of the two gratings; and

groups of lenses correspondingly arranged on rear ends of the two gratings, each of the groups disposed in communication with one of the two output optical fibers and being configured to couple the respective filtered signal from the respective grating into a respective one of the two output optical fibers.

9 . The optical fiber filter of claim 1 , the optical fiber filter further comprising:

first and second input optical fibers for output to first and second output optical fibers;

a first optical fiber circulator in communication with the first input optical fiber and the first output optical fiber;

a second optical fiber circulator in communication with the second input optical fiber and the second output optical fiber;

first total reflection components correspondingly arranged on front ends of the two gratings and being configured to reflect the at least one multi-wavelength optical signal to the respective gratings; and

second total reflection components correspondingly arranged on rear ends of the two gratings, each of the second total reflection components being configured to return a respective filtered signal meeting a Littrow condition along a retracing path to the first and second optical fiber circulator for output from the first and second output optical fiber, respectively.

10 . An optical fiber filter, the optical fiber filter comprising:

at least one input optical fiber;

at least one output optical fiber;

at least one optical fiber circulator in communication with the at least one input optical fiber and the at least one output optical fiber;

a two-dimensional mechanical rotating mirror disposed in optical communication with at least one multi-wavelength optical signal from the at least one input optical fiber, the two-dimensional mechanical rotating mirror being configured to rotate in two-dimensions and being configured to reflect the multi-wavelength optical signal;

a collimating and beam expanding system disposed in optical communication with the at least one multi-wavelength optical signal;

two gratings each disposed in optical communication with the collimating and beam expanding system and configured to disperse the at least one multi-wavelength optical signal into light of different wavelengths at different diffraction angles;

first total reflection components correspondingly arranged on front ends of the two gratings and being configured to reflect the at least one multi-wavelength optical signal to the respective gratings; and

second total reflection components correspondingly arranged on rear ends of the two gratings, each of the second total reflection components being configured to return a respective filtered signal to the at least one optical fiber circulator,

wherein the two-dimensional mechanical rotating mirror is configured to select the light of at least one of the different diffraction angles as the respective filtered signal for output to the output optical fiber, and

wherein a first dimension of the two-dimensional mechanical rotating mirror is configured to tune a wavelength for the filtered signal; and wherein a second dimension is configured to switch between the gratings to achieve an ultra-wide tuning range.

11 . The optical fiber filter of claim 10 , further comprising:

a second optical fiber circulator in communication with a second input optical fiber and a second output optical fiber; and

second total reflection components correspondingly arranged on rear ends of the two gratings, each of the second total reflection components being configured to return a respective filtered signal meeting a Littrow condition along a retracing path to the first and second optical fiber circulator for output from the first and second output optical fiber, respectively.

12 . The optical fiber filter of claim 10 , wherein the gratings comprise a multi-level cascade structure of gratings selected from the group consisting of transmissive gratings, reflective gratings, or a combination of transmissive gratings and reflective gratings.

13 . The optical fiber filter of claim 10 , wherein the two gratings comprise a C-band grating and an L-band grating; and wherein a first dimension of the two-dimensional mechanical rotating mirror is configured to tune a wavelength for the filtered signal; and wherein a second dimension is configured to switch between the C-band and L-band gratings to achieve the ultra-wide tuning range in the entire C+L bands.

14 . The optical fiber filter of claim 10 , wherein the two-dimensional mechanical rotating mirror is configured to adjust power of the respective filtered signal.

15 . The optical fiber filter of claim 10 , wherein the two gratings comprise a C-band grating and an L-band grating.

Assignments (2)

Priority Claims (1)

Continuity (2)

References Cited (13)