# US 2019/0317286 A1 · Comb laser arrays for dwdm interconnects

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- Number: US 2019/0317286 A1
- Document ID: US20190317286A1
- Status: Published application
- Kind: A1
- Application number: 15/953,765
- Filed: 2018-04-16
- Published: 2019-10-17
- Earliest claimed: 2018-04-16
- Assignees: Hewlett Packard Enterprise Development LP
- Applicants: Hewlett Packard Enterprise Development LP
- Inventors: Mir Ashkan Seyedi; Marco Fiorentino; Geza Kurczveil; Raymond G. Beausoleil
- Web page: https://patentgrep.com/patent/US20190317286A1

## CPC

- G02B 6/4249: {comprising arrays of active devices and fibres}
- G02B 6/43: Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections
- G02B 6/4286: {Optical modules with optical power monitoring}
- H01S 3/1305: {Feedback control systems}
- H01S 3/131: by controlling the active medium, e.g. by controlling the processes or apparatus for excitation
- H01S 3/2391: {emitting at different wavelengths}
- H04B 10/506: {Multiwavelength transmitters}
- 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
- H04B: TRANSMISSION

## Abstract

A photonic integrated circuit package includes two arrays or sets of integrated comb laser modules that are bonded to a silicon interposer. Each comb laser of an array has a common or overlapping spectral range, with each laser in the array being optically coupled to a local optical bus. The effective spectral range of the lasers in each array are different, or distinct, as to each array. An optical coupler is disposed within the silicon interposer and is optically coupled to each of the local optical buses. An ASIC (application specific integrated circuit) is bonded to the silicon interposer and provides control and operation of the comb laser modules.

## Claims

### Claim 1

A photonic integrated circuit package, comprising:
a silicon interposer;
a first array of two or more comb laser modules bonded to the silicon interposer, wherein the comb laser modules of the first array have a common spectral output range;
a second array of two or more comb laser modules bonded to the silicon interposer, wherein the comb laser modules of the second array have a common spectral output range;
an optical coupler provided within the silicon interposer, the optical coupler optically coupled to each of the first and second arrays of comb laser modules; and
an ASIC (application specific integrated circuit) bonded to the silicon interposer, the ASIC electronically coupled to each comb laser module of the first and second arrays, wherein the ASIC is further configured to detect failure of one of the two or more comb laser modules in the first array or the second array, and switch operation to another of the two or more comb laser modules in the same array as the detected failure.

### Claim 2 (depends on 1)

The photonic integrated circuit package of claim 1, wherein each comb laser module comprises an optical power monitor electronically coupled to the ASIC.

### Claim 3 (depends on 1)

The photonic integrated circuit package of claim 1, wherein the comb laser modules of the first array have a spectral range of emission different than a spectral range of emission of the comb laser modules of the second array.

### Claim 4 (depends on 1)

The photonic integrated circuit package of claim 1, wherein the ASIC is configured to switch operation from a first comb laser in the first array to a second comb laser in the first array.

### Claim 5 (depends on 4)

The photonic integrated circuit package of claim 4, wherein the ASIC is further configured to receive an instruction to switch over to a specific comb laser module in the first array.

### Claim 6 (depends on 4)

The photonic integrated circuit package of claim 4, wherein the ASIC is further configured to switch operation from a first comb laser in the second array to a second comb laser in the second array.

### Claim 7 (depends on 4)

The photonic integrated circuit package of claim 4, wherein the ASIC is further configured to detect the failure of the one of the two or more comb laser modules in the first array.

### Claim 8 (depends on 1)

The photonic integrated circuit package of claim 1, wherein the ASIC is configured to detect the operating power output of each of the comb laser modules.

### Claim 9 (depends on 1)

The photonic integrated circuit package of claim 1, wherein a first comb laser module of the first array has a spectral range bandwidth of emission of between 7 nm to 11 nm.

### Claim 10 (depends on 1)

The photonic integrated circuit package of claim 1, wherein a combined spectral range of the comb laser modules of the first array and the comb laser modules of the second array have a spectral range bandwidth of emission of between 14 nm to 22 nm.

### Claim 11

A method for controlling a first and second array of comb laser modules disposed on a silicon interposer, the method comprising:
providing power to a first comb laser module in the first array of comb laser modules, the comb laser modules of the first array having a common spectral output range;
providing power to a first comb laser module in a second array of comb laser modules, the comb laser modules of the second array having a common spectral output range;
determining a switch over event for the first array; and
upon determining a switch over event, switching over operation of the first comb laser module in the first array to operation of a second comb laser module in the first array.

### Claim 12 (depends on 11)

The method of claim 11, wherein determining a switch over event comprises:
monitoring the optical power for the first comb laser module; and
detecting that the optical power for the first comb laser module is below a threshold power output value.

### Claim 13 (depends on 11)

The method of claim 11, wherein switching over operation comprises:
ceasing data transmission via the first comb laser module; and
beginning data transmission via the second comb laser module.

### Claim 14 (depends on 11)

The method of claim 11, further determining a switch over event comprises:
receiving an instruction to switch operation to a particular comb laser module of the first array.

### Claim 15 (depends on 11)

The method of claim 11, further comprising:
determining a switch over order for each comb laser module in an array; and
switching over to a second comb laser module in the first array based on the determined switch over order.

### Claim 16 (depends on 15)

The method of claim 15, wherein determining a switch over order comprises:
for each comb laser module in an array:
powering on the comb laser module with a specified voltage; and
recording a peak power of the comb laser module.

### Claim 17 (depends on 11)

The method of claim 11, wherein the comb laser modules of the first array have a spectral range of emission different than a spectral range of emission of the comb laser modules of the second array.

### Claim 18 (depends on 11)

The method of claim 11, wherein the first comb laser module of the first array has a spectral range bandwidth of emission of between 7 nm to 11 nm, and the first comb laser module of the second array has a spectral range bandwidth of emission of between 7 nm to 11 nm.

### Claim 19 (depends on 11)

The method of claim 11, wherein a combined spectral range of the first comb laser module of the first array and the first comb laser module of the second array have a spectral range bandwidth of emission of between 14 nm to 22 nm.

### Claim 20 (depends on 11)

The method of claim 11, further comprising:
identifying the first comb laser module as inoperative; and
disabling the first comb laser module from subsequent use.