Laser, passive optical network system, apparatus and wavelength control method

Patent metadata

Field	Value
Publication number	US-2016204577-A1
Application number	US-201414308335-A
Country	US
Kind code	A1
Filing date	Jun 18, 2014
Priority date	Dec 20, 2011
Publication date	Jul 14, 2016
Grant date	—

Abstract

The present invention provide a laser, where the laser is divided into a laser region and a grating adjustment region through a first electrical isolation layer; the laser region is configured to generate optical signals, where the optical signals include an optical signal with a wavelength corresponding to a “0” signal and an optical signal with a wavelength corresponding to a “1” signal; the grating adjustment region is configured to adjust a wavelength of the grating adjustment region by controlling current of the grating adjustment region, so that the optical signal with the wavelength corresponding to the “1” signal of the laser region passes through the grating adjustment region, and the optical signal with the wavelength corresponding to the “0” signal of the laser region returns to the laser region, thereby implementing suppression to chirp of a directly modulated laser.

First claim

1 . A laser, wherein the laser comprises: a laser region and a grating adjustment region; wherein the laser is divided into the laser region and the grating adjustment region by a first electrical isolation layer;
the laser region is configured to generate optical signals, wherein the optical signals comprise an optical signal with a wavelength corresponding to a “0” signal and an optical signal with a wavelength corresponding to a “1” signal; and the grating adjustment region is configured to adjust a wavelength of the grating adjustment region by controlling current of the grating adjustment region, so that the optical signal with the wavelength corresponding to the “1” signal of the laser region passes through the grating adjustment region, and the optical signal with the wavelength corresponding to the “0” signal of the laser region returns to the laser region.

2 . The laser according to claim 1 , wherein the laser region comprises: a first current generating unit and a first optical signal generating unit, and the first current generating unit comprises: a first electrode sub-layer and a ground electrode; wherein a first current is generated according to a potential difference between the first electrode sub-layer and the ground electrode;
the first optical signal generating unit comprises a first grating that is disposed on a first active layer and is located between the first electrode sub-layer and the ground electrode; the first current generated by the first current generating unit passes through the first grating and the first active layer to generate the optical signals, wherein the optical signals comprise the optical signal with the wavelength corresponding to the “0” signal and the optical signal with the wavelength corresponding to the “1” signal.

3 . The laser according to claim 1 , wherein the grating adjustment region comprises: a second current generating unit and a first optical signal processing unit, wherein
the second current generating unit comprises: a second electrode sub-layer and a first side electrode layer and a second side electrode layer which are disposed at two sides of the second electrode sub-layer; a potential difference between the second electrode sub-layer and the first side electrode layer generates a first current, while a potential difference between the second electrode sub-layer and the second side electrode layer generates a second current; and the first optical signal processing unit comprises: a second grating disposed on a second active layer; wherein a central wavelength of the second grating is adjusted by controlling the first current and the second current that pass through the second grating and are generated by the second current generating unit, so that the optical signal with the wavelength corresponding to the “1” signal of the laser region passes through the second grating; and the optical signal with the wavelength corresponding to the “0” signal of the laser region returns to the laser region.

4 . The laser according to claim 3 , wherein the second current generating unit is configured to, when a voltage exerted on the first side electrode layer and a voltage exerted on the second side electrode layer are both smaller than a voltage exerted on the second electrode sub-layer, enable potential differences to be generated both between the second electrode sub-layer and the first side electrode layer and between the second electrode sub-layer and the second side electrode layer.

5 . The laser according to claim 3 , wherein the second current generating unit is configured to, when a voltage exerted on the first side electrode layer and a voltage exerted on the second side electrode layer are both negative values, and a voltage exerted on the second electrode sub-layer is 0, enable potential differences to be generated both between the second electrode sub-layer and the first side electrode layer and between the second electrode sub-layer and the second side electrode layer.

6 . A passive optical network system, comprising: an optical line terminal and multiple optical network units, wherein the optical line terminal is connected to the multiple optical network units through an optical distribution network, the optical network unit or the optical line terminal comprises a laser, and the laser comprises: a laser region and a grating adjustment region; wherein the laser is divided into the laser region and the grating adjustment region by a first electrical isolation layer;
the laser region is configured to generate optical signals, wherein the optical signals comprise an optical signal with a wavelength corresponding to a “0” signal and an optical signal with a wavelength corresponding to a “1” signal; and the grating adjustment region is configured to adjust a wavelength of the grating adjustment region by controlling current of the grating adjustment region, so that the optical signal with the wavelength corresponding to the “1” signal of the laser region passes through the grating adjustment region, and the optical signal with the wavelength corresponding to the “0” signal of the laser region returns to the laser region.

7 . The passive optical network system according to claim 6 , wherein the laser region comprises: a first current generating unit and a first optical signal generating unit, and the first current generating unit comprises: a first electrode sub-layer and a ground electrode; wherein a first current is generated according to a potential difference between the first electrode sub-layer and the ground electrode; and
the first optical signal generating unit comprises a first grating that is disposed on a first active layer and is located between the first electrode sub-layer and the ground electrode; the first current generated by the first current generating unit passes through the first grating and the first active layer to generate the optical signals, and the optical signals comprise the optical signal with the wavelength corresponding to the “0” signal and the optical signal with the wavelength corresponding to the “1” signal.

8 . The passive optical network system according to claim 6 , wherein the grating adjustment region comprises: a second current generating unit and a first optical signal processing unit, wherein
the second current generating unit comprises: a second electrode sub-layer and a first side electrode layer and a second side electrode layer which are disposed at two sides of the second electrode sub-layer; a potential difference between the second electrode sub-layer and the first side electrode layer generates a first current, and a potential difference between the second electrode sub-layer and the second side electrode layer generates a second current; and the first optical signal processing unit comprises: a second grating disposed on a second active layer; a central wavelength of the second grating is adjusted by controlling the first current and the second current that pass through the second grating and are generated by the second current generating unit, so that the optical signal with the wavelength corresponding to the “1” signal of the laser region passes through the second grating; and the optical signal with the wavelength corresponding to the “0” signal of the laser region returns to the laser region.

9 . The passive optical network system according to claim 8 , wherein the second current generating unit is configured to, when a voltage exerted on the first side electrode layer and a voltage exerted on the second side electrode layer are both smaller than a voltage exerted on the second electrode sub-layer, enable potential differences to be generated both between the second electrode sub-layer and the first side electrode layer and bet

Assignees

• Huawei Tech Co Ltd

Inventors

• Zhou Xiaoping

Classifications

• H01S5/12

  the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers (comprising a photonic bandgap structure H01S5/11; surface-emitting lasers H01S5/18) · CPC title

• H04B10/572

  Wavelength control · CPC title

• H04B10/503

  Laser transmitters · CPC title

• H01S5/06256 Primary

  with DBR-structure · CPC title

• H04B10/5563

  Digital frequency modulation · CPC title