BANDWIDTH ADJUSTABLE OPTICAL MODULE AND SYSTEM

• US 20160301494A1
• Filed: 06/20/2016
• Published: 10/13/2016
• Est. Priority Date: 12/20/2013
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: WEN, Yue, HU, Jing, XU, Zhiguang, LIN, Huafeng, ZHOU, Xiaoping
• Granted Patent: US 10,128,970 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02B 6/29338 Loop resonators
• CPC Class Codes: G02B 6/29361 Interference filters, e.g. multilayer coatings, thin film filters, dichroic splitters or mirrors based on multilayers, WDM filters
• CPC Class Codes: G02B 6/2938 for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
• CPC Class Codes: G02B 6/30 for use between fibre and thin-film device
• CPC Class Codes: G02B 6/4206 Optical features G02B6/4207, G02B6/421 take precedence
• CPC Class Codes: G02B 6/4215 the intermediate optical elements being wavelength selective optical elements, e.g. variable wavelength optical modules or wavelength lockers G02B6/4246 takes precedence
• CPC Class Codes: G02B 6/4246 Bidirectionally operating package structures
• CPC Class Codes: G02B 6/4263 of the transisitor outline [TO] can type
• CPC Class Codes: G02B 6/4278 related to pluggable or demountable opto-electronic or electronic elements
• CPC Class Codes: G02B 6/428 containing printed circuit boards [PCB]
• CPC Class Codes: G02B 6/4284 of optical modules with disconnectable electrical connectors latching arms for electrical connectors H01R13/627
• CPC Class Codes: G02B 6/4292 the light guide being disconnectable from the opto-electronic element, e.g. mutually self aligning arrangements
• CPC Class Codes: G02B 6/4295 coupling with semiconductor devices activated by light through the light guide, e.g. thyristors, phototransistors
• CPC Class Codes: H04B 10/27 Arrangements for networking
• CPC Class Codes: H04B 10/40 Transceivers
• CPC Class Codes: H04B 10/503 Laser transmitters
• CPC Class Codes: H04J 14/02 Wavelength-division multiplex systems
• CPC Class Codes: H04J 14/0236 using multiple wavelengths
• CPC Class Codes: H04J 14/0245 for downstream transmission, e.g. optical line terminal [OLT] to ONU
• CPC Class Codes: H04J 14/0249 for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
• CPC Class Codes: H04J 14/0282 : WDM tree architectures

Abstract

A circuit board of the optical module comprises: a first electrical interface is configured to connect an electrical interface of a board or a second electrical interface of another optical module, and a second electrical interface is configured to connect a first electrical interface of another optical module; a first optical port is configured to connect an optical transmission device or a second optical port of another optical module, and a second optical port is configured to connect an optical receiving device or a first optical port of another optical module; and a optical transceiver assembly multiplexes downstream light and demultiplexes upstream light. The optical module provided in solutions of the present invention can be flexibly combined with another optical module, enabling flexible and gradual upgrade of an optical module bandwidth according to a user requirement by using various combination manners.

Claims

1. An optical module, applied to a passive optical network, wherein a circuit board of the optical module is provided with a first electrical interface and a second electrical interface, a first optical port and a second optical port, and an optical transceiver assembly;

the first electrical interface is configured to connect an electrical interface of a board or a second electrical interface of another optical module, and the second electrical interface is configured to connect a first electrical interface of another optical module or an electrical interface of the board;

the first optical port is configured to connect an optical transmission device or a second optical port of another optical module, and the second optical port is configured to connect an optical receiving device or a first optical port of another optical module; and

after being input into the optical transceiver assembly through the first optical port, downstream incident light is multiplexed, by using the optical transceiver assembly, with light that is generated by the optical transceiver assembly, and downstream light formed by multiplexing is output through the second optical port; and

after upstream incident light is input into the optical transceiver assembly through the second optical port, light corresponding to a wavelength of the optical module is filtered out by using the optical transceiver assembly, and upstream light remaining after filtering is output through the first optical port.

2. The optical module according to claim 1, wherein the first optical port contains a first upstream optical port and a first downstream optical port, and the second optical port contains a second upstream optical port and a second downstream optical port;

after being input into the optical transceiver assembly through the first downstream optical port, the downstream incident light is multiplexed with the light that is generated by the optical transceiver assembly, and the downstream light formed by multiplexing is output through the second downstream optical port; and

after the upstream incident light is input into the optical transceiver assembly through the second upstream optical port, the light corresponding to the wavelength of the optical module is filtered out by using the optical transceiver assembly, and the upstream light remaining after filtering is output through the first upstream optical port.

3. The optical module according to claim 2, wherein the transceiver optical assembly comprises a receiver optical subassembly and a transmitter optical subassembly, the transmitter optical subassembly comprises a semiconductor laser diode, LD, a collimation lens, a filter thin film filter (TFF), a self-focusing lens Grin lens, an optical fiber tube, and two optical fibers that are provided in the optical fiber tube, wherein the two optical fibers are connected to the first downstream optical port and the second downstream optical port respectively;

after being led to the Grin lens through a first optical fiber in the optical fiber tube, downstream incident light of a first wavelength enters the TFF;

the LD emits light of a second wavelength, and the light of the second wavelength enters the TFF in a collimated manner through the collimation lens; and

the TFF multiplexes the light of the second wavelength and the light of the first wavelength to form downstream light, and the downstream light is output through a second optical fiber of the two optical fibers by using the Grin lens and the optical fiber tube.

4. The optical module according to claim 3, wherein the transmitter optical subassembly further comprises any type of housing of a miniature device case, a transistor outline case, and an integral case, wherein the LD, the collimation lens, the TFF, the Grin lens, and the optical fiber tube are packaged in the any type of case.

5. The optical module according to claim 2, wherein the optical module further comprises a wavelength division multiplexer (WDM) and the optical transceiver assembly comprises a semiconductor laser diode (LD), a receiver APD, a silicon microring resonator, and a collimation lens, wherein

after entering a first microring through an upper semi-ring of the first microring in the silicon microring resonator, light of a second wavelength emitted by the LD is transmitted to a first straight line that is connected to a lower semi-ring of the first microring, and is multiplexed with downstream incident light of a first wavelength, and after being reflected to the second downstream optical port by using the collimation lens, light obtained by multiplexing enters the WDM and is output, wherein the downstream incident light of the first wavelength is input to the first straight line of the optical module through the first downstream optical port;

and

upstream incident light is reflected by the WDM to the second upstream optical port and enters the optical module, the collimation lens in the optical module reflects the upstream incident light to a second straight line in the silicon microring resonator, and a second microring and a third microring in the silicon microring resonator that are connected to the second straight line correspondingly pass light, of a third wavelength corresponding to the wavelength of the optical module, formed by a transverse electric (TE) wave and a transverse magnetic (TM) wave, and send the light of the third wavelength to the APD for receiving, wherein light of another wavelength except the light of the third wavelength in the upstream light is reflected by the second straight line in the microring to the first upstream optical port for output.

6. The optical module according to claim 1, wherein the optical transceiver assembly comprises a first wavelength division multiplexer WDM 1, a second wavelength division multiplexer WDM 2, a semiconductor laser diode LD, a first filter TFF 1, a second filter TFF 2, a receiver APD, and a mirror, wherein

when entering the optical module through the first optical port and being reflected by the mirror to the TFF 1, downstream incident light of a first wavelength is reflected, and is multiplexed with light of a second wavelength generated by the LD, and after entering the WDM 1, downstream light formed by multiplexing is projected to the second optical port for output;

and

after upstream incident light enters the optical module through the second optical port, the upstream incident light is reflected to the TFF 2 by using the WDM 1, and the TFF 2 passes light of a third wavelength corresponding to the wavelength of the optical module and sends the light of the third wavelength to the APD for receiving, wherein after being reflected by the TFF 2, light of another wavelength except the light of the third wavelength in the upstream incident light is reflected by the WDM 2 and the mirror to the first optical port for output.

7. A bandwidth adjustable optical module, wherein the bandwidth adjustable optical module comprises at least two optical modules according to claim 1, the at least two optical modules are cascaded by using the first electrical interface, the second electrical interface, the first optical port, and the second optical port, and an adjustable bandwidth of the bandwidth adjustable optical module formed by cascading is a sum of bandwidths of the cascaded optical modules, wherein a first electrical interface of a first optical module of the two cascaded optical modules is connected to a second electrical interface of a second optical module, and a first optical port of the first optical module is connected to a second optical port of the second optical module;

and

an optical port of the cascaded optical modules that is not connected to another optical module is correspondingly connected to an optical transceiver device, and an electrical interface of the cascaded optical modules that is not connected to another optical module is correspondingly connected to a board.

8. A bandwidth adjustable optical module, comprising at least two optical modules, an optical multiplexer/demultiplexer, and a board, wherein

the optical module, applied to a passive optical network, wherein a circuit board of the optical module is provided with a first electrical interface and a second electrical interface, a first optical port and a second optical port, and an optical transceiver assembly;

the first electrical interface is configured to connect an electrical interface of a board or a second electrical interface of another optical module, and the second electrical interface is configured to connect a first electrical interface of another optical module or an electrical interface of the board;

the first optical port is configured to connect an optical transmission device or a second optical port of another optical module, and the second optical port is configured to connect an optical receiving device or a first optical port of another optical module; and

after being input into the optical transceiver assembly through the first optical port, downstream incident light is multiplexed, by using the optical transceiver assembly, with light that is generated by the optical transceiver assembly, and downstream light formed by multiplexing is output through the second optical port; and

after upstream incident light is input into the optical transceiver assembly through the second optical port, light corresponding to a wavelength of the optical module is filtered out by using the optical transceiver assembly, and upstream light remaining after filtering is output through the first optical port;

first electrical interfaces and second electrical interfaces of the at least two optical modules are connected to the board, first optical ports and second optical ports of the at least two optical modules are connected to the optical multiplexer/demultiplexer, and an adjustable bandwidth of the bandwidth adjustable optical module is a sum of bandwidths of the at least two optical modules; and

the multiplexer/demultiplexer is disposed on the board, demultiplexes an optical signal input into the at least two optical modules, sends optical signals obtained by demultiplexing to corresponding optical modules, receives optical signals output by the at least two optical modules, multiplexes the received optical signals, and outputs an optical signal obtained by multiplexing through an optical fiber.

9. An optical line terminal, wherein the optical line terminal comprises the optical module;

wherein the optical module, applied to a passive optical network, wherein a circuit board of the optical module is provided with a first electrical interface and a second electrical interface, a first optical port and a second optical port, and an optical transceiver assembly;

the first electrical interface is configured to connect an electrical interface of a board or a second electrical interface of another optical module, and the second electrical interface is configured to connect a first electrical interface of another optical module or an electrical interface of the board;

the first optical port is configured to connect an optical transmission device or a second optical port of another optical module, and the second optical port is configured to connect an optical receiving device or a first optical port of another optical module; and

after being input into the optical transceiver assembly through the first optical port, downstream incident light is multiplexed, by using the optical transceiver assembly, with light that is generated by the optical transceiver assembly, and downstream light formed by multiplexing is output through the second optical port; and

after upstream incident light is input into the optical transceiver assembly through the second optical port, light corresponding to a wavelength of the optical module is filtered out by using the optical transceiver assembly, and upstream light remaining after filtering is output through the first optical port.

10. A passive optical network system, wherein the system comprises an optical line terminal and an optical network terminal, wherein the optical line terminal comprises the optical module, applied to a passive optical network, wherein a circuit board of the optical module is provided with a first electrical interface and a second electrical interface, a first optical port and a second optical port, and an optical transceiver assembly;

the first electrical interface is configured to connect an electrical interface of a board or a second electrical interface of another optical module, and the second electrical interface is configured to connect a first electrical interface of another optical module or an electrical interface of the board;

the first optical port is configured to connect an optical transmission device or a second optical port of another optical module, and the second optical port is configured to connect an optical receiving device or a first optical port of another optical module; and

after being input into the optical transceiver assembly through the first optical port, downstream incident light is multiplexed, by using the optical transceiver assembly, with light that is generated by the optical transceiver assembly, and downstream light formed by multiplexing is output through the second optical port; and

after upstream incident light is input into the optical transceiver assembly through the second optical port, light corresponding to a wavelength of the optical module is filtered out by using the optical transceiver assembly, and upstream light remaining after filtering is output through the first optical port.