# US 2019/0173585 A1 · Optical mode matching

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- Number: US 2019/0173585 A1
- Document ID: US20190173585A1
- Status: Published application
- Kind: A1
- Application number: 16/261,418
- Filed: 2019-01-29
- Published: 2019-06-06
- Earliest claimed: 2017-02-07
- Assignees: Hewlett Packard Enterprise Development LP
- Applicants: Hewlett Packard Enterprise Development LP
- Inventors: Wayne Sorin; Michael Renne Ty Tan; Sagi V. Mathai; Georgios Panotopoulos; Paul K. Rosenberg
- Web page: https://patentgrep.com/patent/US20190173585A1

## CPC

- H04B 10/503: {Laser transmitters}
- G02B 6/29367: {Zigzag path within a transparent optical block, e.g. filter deposited on an etalon, glass plate, wedge acting as a stable spacer}
- G02B 6/4204: {the coupling comprising intermediate optical elements, e.g. lenses, holograms (encapsulated active devices H01S5/02208)}
- G02B 6/4214: {the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device (G02B6/4246 takes precedence)}
- G02B 6/4231: {with intermediate elements, e.g. rods and balls, between the elements}
- H01S 5/0071: {for beam steering, e.g. using a mirror outside the cavity to change the beam direction}
- H01S 5/026: Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers (stabilisation of output H01S5/06)
- H01S 5/18305: {with emission through the substrate, i.e. bottom emission}
- H01S 5/4012: {Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms}
- H01S 5/4087: {emitting more than one wavelength}
- H01S 5/423: {having a vertical cavity}
- H01S 5/005: {Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping (H01S5/026, H01S5/18388 take precedence)}
- H01S 5/02251: using optical fibres
- H04Q 2011/0009: {using wavelength filters}
- H04B: TRANSMISSION
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- H04Q: SELECTING (switches, relays, selectors H01H; wireless communication networks H04W)

## Abstract

An apparatus includes a first and second VCSEL, each with an integrated lens. The VCSELs emit a first light beam having first optical modes at first wavelengths and a second light beam having second optical modes at second wavelengths. The apparatus also has an optical block with a first and second surface, a mirror coupled to the second surface, and a wavelength-selective filter coupled to the first surface. The first integrated lens mode matches the first beam to the optical block, and the second integrated lens mode matches the second beam to the optical block such that the first beam and second beam each have substantially a beam waist with a beam waist dimension at the first and second input region, respectively. An exit beam that includes light from the first beam and the second beam is output from the second surface of the optical block.

## Claims

### Claim 1

An apparatus comprising:
a first vertical-cavity surface-emitting laser (VCSEL) to emit a first light beam having first optical modes at first wavelengths, wherein the first VCSEL has a first integrated lens;
a transmissive optical block having a first input region on a first surface to receive the first beam, and an output region on a second surface to output an exit light beam, wherein the first integrated lens mode matches the first beam to the optical block such that the first beam has substantially a beam waist (BW) with a BW dimension at the first input region;
a second VCSEL to emit a second light beam having second optical modes at second wavelengths, wherein the second VCSEL has a second integrated lens, wherein the optical block has a second input region on the first surface to receive the second beam, wherein the second integrated lens mode matches the second beam to the optical block such that the second beam has substantially the BW with approximately the BW dimension at the second input region;
a mirror coupled to the second surface to reflect and focus the first beam to the second input region to substantially the BW with approximately the BW dimension at the second input region;
a wavelength-selective filter coupled to the second input region to transmit light at the second wavelengths and reflect light at the first wavelengths,
wherein the exit beam includes light from the first beam and the second beam.

### Claim 2 (depends on 1)

The apparatus of claim 1, further comprising an output lens coupled to the output region to mode match the exit light beam to a transmission medium such that the exit light beam has substantially a beam waist with approximately the beam waist dimension at an entrance to the transmission medium.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the VCSEL is bottom-emitting.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein an optical axis of the first integrated lens is offset from an emission direction of the first light beam, and an optical axis of the second integrated lens is offset from an emission direction of the second light beam such that a first distance between the first surface and the first integrated lens is substantially the same as a second distance between the first surface and the second integrated lens.

### Claim 5

(canceled)

### Claim 6

(canceled)

### Claim 7

(canceled)

### Claim 8

(canceled)

### Claim 9

(canceled)

### Claim 10

(canceled)

### Claim 11

(canceled)

### Claim 12

An optical system comprising:
a transmissive optical body, wherein the transmissive optical body has a first surface and a second surface opposite the first surface;
a first focuser coupled to the second surface to receive and focus a multi-wavelength light beam to approximately a beam waist at the first surface;
a plurality of reflective focusers (RFs) coupled to the second surface, wherein a light beam impinging on each RF from within the optical body is reflected and focused by the RF within the optical body to approximately the beam waist at the first surface;
a plurality of wavelength selective elements (WSEs) coupled to the first surface, wherein each WSE transmits at least some light at a first set of wavelengths and reflects at least some light at a second set of wavelengths, and each WSE transmits a wavelength-dependent beam having a different first set of wavelengths,
wherein the first focuser, the plurality of RFs, and the plurality of WSEs are positioned such that a portion of the multi-wavelength light beam is redirected within the optical body alternately to each WSE and each RF until exiting the first surface.

### Claim 13 (depends on 12)

The optical system of claim 12, further comprising:
a plurality of optical detectors, wherein each optical detector is to receive a different one of the wavelength-dependent beams transmitted by the plurality of WSEs;
a plurality of detector lenses to focus the wavelength-dependent beams onto an active area of a corresponding optical detector.

### Claim 14 (depends on 12)

The optical system of claim 12, wherein the multi-wavelength light beam is received from a transmission medium.

### Claim 15 (depends on 12)

The optical system of claim 12, further comprising:
a plurality of transmission media, each of the transmission media to receive a different one of the wavelength-dependent beams transmitted by the plurality of WSEs; and
a plurality of transmission media lenses having a focal length to mode match the wavelength-dependent beams to the plurality of transmission media.