# US 11,442,224 B2 · Optical channel bandwidth analyzer

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- Number: US 11,442,224 B2
- Document ID: US11442224B2
- Status: Granted
- Kind: B2
- Application number: 16/693,980
- Filed: 2019-11-25
- Published: 2020-06-04
- Granted: 2022-09-13
- Earliest claimed: 2018-12-03
- Assignees: Panduit Corp.
- Applicants: Panduit Corp.
- Inventors: Richard J. Pimpinella; Jose M. Castro; Asher S. Novick; Yu Huang; Bulent Kose
- Web page: https://patentgrep.com/patent/US11442224B2

## CPC

- G02B 6/0288: {Multimode fibre, e.g. graded index core for compensating modal dispersion}
- H04B 10/2581: Multimode transmission
- G01S 7/4818: {using optical fibres}
- G01S 7/4917: {superposing optical signals in a photodetector, e.g. optical heterodyne detection}
- H01S 5/183: having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H04B 10/071: using a reflected signal, e.g. using optical time domain reflectometers [OTDR]
- H04B 10/691: {Arrangements for optimizing the photodetector in the receiver}
- G02B 6/4246: {Bidirectionally operating package structures}
- G02B 6/4292: {the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements}
- G02B 2006/12121: {Laser}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04B: TRANSMISSION
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL

## Abstract

A test apparatus has at least one optical source, a high-speed photodetector, a microcontroller or processor, and electrical circuitry to power and drive the optical source, high-speed photodetector, and microcontroller or processor. The apparatus measures the frequency response and optical path length of a multimode optical fiber under test, utilizes a reference VCSEL spatial spectral launch condition and modal-chromatic dispersion interaction data to estimate the channels total modal-chromatic bandwidth of the fiber under test, and computes and presents the estimated maximum data rate the fiber under test can support.

## Claims

### Claim 1

A test apparatus comprising:
at least one optical source;
a high-speed photodetector;
a microcontroller or processor; and
electrical circuitry to power and drive the optical source, high-speed photodetector, and microcontroller or processor, wherein the apparatus measures the frequency response and optical path length of a multimode optical fiber under test, utilizes a reference VCSEL spatial spectral launch condition and modal-chromatic dispersion interaction data to estimate total modal-chromatic bandwidth of the fiber under test, and computes and presents the estimated maximum data rate the fiber under test can support.

### Claim 2 (depends on 1)

An apparatus according to claim 1, wherin said apparatus verifies that a specified data rate can be supported over the fiber channel under test.

### Claim 3

An apparatus according to clam 1, further comprising a display for presenting test results to a user.

### Claim 4 (depends on 1)

An apparatus according to claim 1, further comprising a patch cord attached between the source and fiber under test, wherein the patch cord is designed to provide a worst case launch condition for a given Ethernet or Fiber Channel application.

### Claim 5 (depends on 1)

An apparatus according to claim 1, wherein a switch and a set of patch cords are attached between the source and fiber under test, further wherein the apparatus can automatically switch among the patch cords to create diverse launch conditions to address worst case sources for a given Ethernet or Fiber Channel application.

### Claim 6 (depends on 1)

An apparatus according to claim 1, wherein the at least one optical source is a VCSEL selected to excite the relevant mode groups of the fiber optical channel under test.

### Claim 7 (depends on 6)

An apparatus according to claim 6, wherein a bias current of the VCSEL is controlled to provide worst case spectral width and launch condition to provide worst case conditions testing.