CN108768534A - An optical transceiver integrated component - Google Patents

Abstract

The embodiment of the present invention proposes an optical transceiver integrated assembly, including: a wavelength division multiplexing filter of an external optical fiber, a laser, a photodetector, and a CMOS ASIC chip; wherein, the wavelength division multiplexing filter, the laser, the photoelectric detector The device and the CMOS ASIC chip are packaged together in the same metal cavity; the CMOS ASIC chip includes: a base, and a functional module fixed on the base; wherein, the functional module includes: a laser driver, a limiting amplifier, a transimpedance amplifier, Microcontroller; using low-power CMOS technology, integrated in the CMOS ASIC chip, so that the overall module can be packaged in a metal cavity for external optical fiber. The assembly mode in this solution makes the function of the overall electronic device of the optical transceiver assembly more complete, and the connection between high-speed modules is realized inside the chip, which reduces the loss caused by the external circuit board in the prior art; the realization of functional integration improves the It ensures the convenience and consistency of the assembly of optical transceiver components.

Description

An optical transceiver integrated component

technical field

The invention relates to the field of optical communication, in particular to an integrated optical transceiver component.

Background technique

With the rapid development of broadband networks in recent years, the transmission speed of digital signals has gradually been paid attention to. At present, optical fiber is the most ideal among various transmission media in broadband network. It is characterized by large transmission capacity, good transmission quality, low loss, and long relay distance.

Optical fiber broadband is to convert the data to be transmitted from electrical signals to optical signals for communication. Both ends of the optical fiber are equipped with "optical cats" for signal conversion. Optical modem, also known as single-port optical transceiver, is a three-piece optical fiber transmission equipment developed for special user environments. An optical modem is a device similar to a baseband modem (digital modem). The difference from a baseband modem is that it is connected to an optical fiber dedicated line and is an optical signal. It is used for the conversion of photoelectric signals and interface protocols in the WAN, and it is connected to the router, which is the WAN access. The photoelectric transceiver is used to convert the photoelectric signal in the local area network, but only the signal conversion, without the conversion of the interface protocol.

Optical fiber transceivers are generally used in actual network environments where Ethernet cables cannot be covered and optical fibers must be used to extend the transmission distance. At the same time, they also play a huge role in helping to connect the last mile of optical fiber to the metropolitan area network and the outer network. role. With fiber optic transceivers, it also provides an inexpensive solution for users who need to upgrade their systems from copper wires to fiber optics and lack money, manpower, or time. The function of the optical fiber transceiver is to convert the electrical signal we want to send into an optical signal and send it out, and further convert the received optical signal into an electrical signal and input it to our receiving end.

However, the current optical fiber transceivers are produced by external assembly, which will cause splicing line loss, low consistency, high-speed optical component assembly is difficult, and the yield rate will be affected. At the same time, it is difficult to accurately monitor the operating temperature of the electronic devices in the external assembly method, which affects the efficiency of converting electrical signals to optical signals to a certain extent and affects the transmission distance.

Therefore, a better optical fiber transceiver is currently required.

Contents of the invention

In view of this, the present invention proposes an optical transceiver integrated component to solve the above problems.

Specifically, the present invention proposes the following specific embodiments:

The embodiment of the present invention proposes an optical transceiver integrated assembly, including: a wavelength division multiplexing filter of an external optical fiber, a laser, a photodetector, and a CMOS ASIC chip; wherein, the wavelength division multiplexing filter, the The laser, the photodetector, and the CMOS ASIC chip are packaged together in the same metal cavity;

The wavelength division multiplexing filter is respectively connected to the laser and the photodetector;

Both the laser and the photodetector are connected to the CMOS ASIC chip;

The CMOS ASIC chip includes: a base, and a functional module fixed on the base; wherein, the functional module includes: a laser driver, a limiting amplifier, a transimpedance amplifier, and a microcontroller; wherein, the Under the control of the microcontroller, the laser driver drives the laser to emit laser light and sends it to the external optical fiber through the wavelength division multiplexing filter; through the control of the microcontroller, the transimpedance amplifier will come from The electrical signal of the photodetector is converted, and the converted electrical signal is sent to the limiting amplifier, so that the limiting amplifier processes the obtained electrical signal into a digital voltage signal of equal amplitude and then outputs it.

In a specific embodiment, the laser driver is a high-speed current switch for inputting modulation current to the laser.

In a specific embodiment, the laser corresponds to a threshold current;

The CMOS ASIC chip also includes an automatic power controller;

Under the control of the microcontroller, the laser driver provides the laser with a DC bias current greater than the threshold current through the automatic power controller, so that the laser can stabilize and average Laser output at optical power.

In a specific embodiment, the laser driver is used to monitor the DC bias current and give a fault alarm.

In a specific embodiment, the photodetector is used to convert the signal from the optical fiber received through the wavelength division multiplexing filter into an analog current signal.

In a specific embodiment, the transimpedance amplifier converts the analog current signal from the photodetector to generate an analog voltage signal.

In a specific embodiment, the CMOS ASIC chip further includes: a temperature sensor for monitoring the temperature of the laser.

In a specific embodiment, the CMOS ASIC chip further includes: an automatic gain control circuit for current control and voltage control.

Therefore, the embodiment of the present invention proposes an integrated optical transceiver assembly, including: a wavelength division multiplexing filter of an external optical fiber, a laser, a photodetector, and a CMOS ASIC chip; wherein the wavelength division multiplexing filter , the laser, the photodetector, and the CMOS ASIC chip are packaged together in the same metal cavity; the wavelength division multiplexing filter is respectively connected to the laser and the photodetector; the laser and the The photodetectors are all connected to the CMOSASIC chip; the CMOS ASIC chip includes: a base, and a functional module fixed on the base; wherein, the functional module includes: a laser driver, a limiting amplifier, a span Impedance amplifier, microcontroller; wherein, the laser driver is under the control of the microcontroller, drives the laser to emit laser light and sends it to the external optical fiber through the wavelength division multiplexing filter; through the microcontroller The transimpedance amplifier converts the electrical signal from the photodetector, and sends the converted electrical signal to the limiting amplifier, so that the limiting amplifier converts the obtained electrical signal After being processed into a digital voltage signal of equal amplitude, it is output. Using low-power CMOS technology, integrated in the CMOS ASIC chip, so that the whole module can be uniformly packaged into a metal cavity for external optical fiber. The assembly mode in this solution makes the function of the overall electronic device of the optical transceiver assembly more complete, and the connection between the high-speed modules is realized inside the chip, which reduces the loss caused by the external circuit board in the prior art; the functional integration realizes and improves It ensures the convenience and consistency of the assembly of optical transceiver components.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus It should be regarded as a limitation on the scope, and those skilled in the art can also obtain other related drawings based on these drawings without creative work.

FIG. 1 is a schematic structural diagram of an integrated optical transceiver assembly proposed by an embodiment of the present invention.

Detailed ways

Hereinafter, various embodiments of the present disclosure will be described more fully. The present disclosure is capable of various embodiments, and adaptations and changes are possible therein. It is to be understood, however, that there is no intention to limit the various embodiments of the present disclosure to the particular embodiments disclosed herein, but that the present disclosure be construed to cover those falling within the spirit and scope of various embodiments of the present disclosure. All adjustments, equivalents and/or alternatives.

Terms used in various embodiments of the present disclosure are for the purpose of describing specific embodiments only and are not intended to limit the various embodiments of the present disclosure. As used herein, singular forms are intended to include plural forms as well, unless the context clearly dictates otherwise. Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present disclosure belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, Unless clearly defined in various embodiments of the present disclosure.

Example

The embodiment of the present invention discloses an optical transceiver integrated assembly, as shown in Figure 1, including: a wavelength division multiplexing filter of an external optical fiber, a laser, a photodetector, and a CMOS ASIC chip; wherein, the wavelength division multiplexing The filter, the laser, the photodetector, and the CMOSASIC chip are packaged together in the same metal cavity;

The wavelength division multiplexing filter is respectively connected to the laser and the photodetector;

Both the laser and the photodetector are connected to the CMOS ASIC chip;

The CMOS ASIC chip includes: a base, and a functional module fixed on the base; wherein, the functional module includes: a laser driver, a limiting amplifier, a transimpedance amplifier, and a microcontroller; wherein, the Under the control of the microcontroller, the laser driver drives the laser to emit laser light and sends it to the external optical fiber through the wavelength division multiplexing filter; through the control of the microcontroller, the transimpedance amplifier will come from The electrical signal of the photodetector is converted, and the converted electrical signal is sent to the limiting amplifier, so that the limiting amplifier processes the obtained electrical signal into a digital voltage signal of equal amplitude and then outputs it.

Specifically, this solution provides an optical transceiver integrated component (Bi- directional Optical SubAssembly, referred to as BOSA). The optical transceiver integrated assembly of the present invention includes: a laser diode (LD for short), a photodetector (PD for short), and a dedicated CMOS ASIC chip. The above-mentioned modules are all assembled on the same substrate, using ASIC technology to achieve miniaturization, and can be packaged together with a wavelength division multiplexing filter (Wavelength Division Multiplexing, referred to as WDM) in the same metal cavity, and externally connected to an optical fiber.

Therefore, this solution makes the functions of BOSA's overall electronic devices more complete, and the connection between high-speed modules is realized inside the CMOS ASIC chip, which reduces the loss caused by the external circuit board in the prior art; the realization of functional integration improves the Convenience and consistency in the assembly of optical transceiver components; at the same time, the working temperature of LD can be accurately detected.

Specifically, the CMOS ASIC chip includes: Laser Driver (Laser Driver, referred to as LDD), limiting amplifier (Limiting Amplifier, referred to as LA), transimpedance amplifier (Tran impedance Amplifier, referred to as TIA), automatic power controller APC (auto power controller), and microcontroller (Control Block).

Using CMOS ASIC special chip technology to achieve miniaturization, it can be packaged together with the wavelength division multiplexing filter (Wavelength Division Multiplexing, referred to as WDM) in the same metal cavity, and externally connected to the optical fiber.

In a specific embodiment, the laser driver is a high-speed current switch for inputting modulation current to the laser.

In a specific embodiment, the laser corresponds to a threshold current;

The CMOS ASIC chip also includes an automatic power controller;

Under the control of the microcontroller, the laser driver provides the laser with a DC bias current greater than the threshold current through the automatic power controller, so that the laser can stabilize and average Laser output at optical power.

In a specific embodiment, the laser driver is used to monitor the DC bias current and give a fault alarm.

In a specific embodiment, the photodetector is used to convert the signal from the optical fiber received through the wavelength division multiplexing filter into an analog current signal.

In a specific embodiment, the transimpedance amplifier converts the analog current signal from the photodetector to generate an analog voltage signal.

In a specific embodiment, the CMOS ASIC chip further includes: a temperature sensor for monitoring the temperature of the laser.

In a specific embodiment, the CMOS ASIC chip further includes: an automatic gain control circuit for current control and voltage control.

In addition, specifically, as shown in Figure 1, the specific device of this solution may include an optical transmission link and an optical reception link

Among them, the function of the optical transmission link is composed of the following functional modules: the laser driver is connected with the laser, and at the same time connected with the microcontroller. The working principle of the optical transmission link is to convert the received electrical signal with information into an optical signal through the photoelectric principle, and the laser, for example, can be a laser diode through a wavelength division multiplexing filter (WDM). optical fiber. Wherein, the laser driver can be a high-speed current switch, which can input modulation current for the laser. The microcontroller is connected to the laser driver, and the laser can be provided with a DC bias current (IBIAS) slightly greater than the threshold current (ITH) through the automatic power controller (APC), so that it can stabilize the average optical power ( PAVG) to output the corresponding laser.

In addition, the laser driver also has functions such as fault warning and bias current monitoring.

As for the optical receiving link, it consists of the following functional modules: a photodetector, a transimpedance amplifier and a limiting amplifier are connected, and a transimpedance amplifier and a limiting amplifier are connected to a controller. The working principle of the optical receiving link is that the photodetector (PD) converts the signal from the optical fiber received by the wavelength division multiplexing filter (WDM) into an electrical signal, and the transimpedance amplifier (TIA) and limiting amplifier ( LA) The converted electrical signal is processed into a processable electrical signal. The transimpedance amplifier receives an analog current signal, which must be converted into an analog voltage signal to be recognized by the signal processing circuit. Under the control of the controller, the limiting amplifier processes the signals with different amplitudes output by the transimpedance amplifier into digital voltage signals of equal amplitude for further processing. At the same time, the controller controls the voltage range through the photodetector PD bias circuit to achieve the above-mentioned optimal bit error rate effect of temperature control.

Further, besides functions such as temperature control and voltage control, the microcontroller can also realize data control.

In the solution of the present application, a wavelength division multiplexing filter is connected to the photodetector and the laser, so that the photodetector and the laser can detect their respective corresponding wavebands. Among them, the temperature detection, current control, signal mode conversion, and voltage control realized by the microcontroller are realized by a temperature sensor, an analog-to-digital conversion (ADC), and an automatic gain control (AGC) circuit. Among them, due to the integrated feature of this solution, the temperature detection accuracy of the working environment of the photodetector is improved, so that the temperature control effect can be optimized. At the same time, the integrated feature of this solution prevents the signal from being lost in the long connection circuit, and reduces the noise mixed in the signal transmission path.

Therefore, the embodiment of the present invention proposes an integrated optical transceiver assembly, including: a wavelength division multiplexing filter of an external optical fiber, a laser, a photodetector, and a CMOS ASIC chip; wherein the wavelength division multiplexing filter , the laser, the photodetector, and the CMOS ASIC chip are packaged together in the same metal cavity; the wavelength division multiplexing filter is respectively connected to the laser and the photodetector; the laser and the The photodetectors are all connected to the CMOSASIC chip; the CMOS ASIC chip includes: a base, and a functional module fixed on the base; wherein, the functional module includes: a laser driver, a limiting amplifier, a span Impedance amplifier, microcontroller; wherein, the laser driver is under the control of the microcontroller, drives the laser to emit laser light and sends it to the external optical fiber through the wavelength division multiplexing filter; through the microcontroller The transimpedance amplifier converts the electrical signal from the photodetector, and sends the converted electrical signal to the limiting amplifier, so that the limiting amplifier converts the obtained electrical signal After being processed into a digital voltage signal of equal amplitude, it is output. Using low-power CMOS technology, integrated in the CMOS ASIC chip, so that the whole module can be uniformly packaged into a metal cavity for external optical fiber. The assembly mode in this solution makes the function of the overall electronic device of the optical transceiver assembly more complete, and the connection between the high-speed modules is realized inside the chip, which reduces the loss caused by the external circuit board in the prior art; the functional integration realizes and improves It ensures the convenience and consistency of the assembly of optical transceiver components.

Those skilled in the art can understand that the accompanying drawing is only a schematic diagram of a preferred implementation scenario, and the modules or processes in the accompanying drawings are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the modules in the devices in the implementation scenario can be distributed among the devices in the implementation scenario according to the description of the implementation scenario, or can be located in one or more devices different from the implementation scenario according to corresponding changes. The modules of the above implementation scenarios can be combined into one module, or can be further split into multiple sub-modules.

The above serial numbers of the present invention are for description only, and do not represent the pros and cons of the implementation scenarios.

The above disclosures are only some specific implementation scenarios of the present invention, however, the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (8)

1. a kind of light transmit-receive integrated component, which is characterized in that including：Wave-division multiplexer filter, laser, the photoelectricity of external connection optical fiber Detector and CMOS asic chips；Wherein, the wave-division multiplexer filter, the laser, the photodetector, with And the CMOS asic chips are mutually encapsulated into same metal cavity；

The wave-division multiplexer filter is separately connected the laser and the photodetector；

The laser is all connected with the CMOS asic chips with the photodetector；

The CMOS asic chips include：Pedestal and the function module being fixed on the pedestal；Wherein, the function mould Block includes：Laser driver, limiting amplifier, trans-impedance amplifier, microcontroller；Wherein, the laser driver is in institute Under the control for stating microcontroller, the laser transmitting laser is driven to send the optical fiber of external connection via the wave-division multiplexer filter On；By the control of the microcontroller, the trans-impedance amplifier converts the electric signal from the photodetector, And transformed electric signal is sent to the limiting amplifier, so that the Electric signal processing that the limiting amplifier will be got To be exported after the digital voltage signal of constant amplitude.

2. a kind of light transmit-receive integrated component as described in claim 1, which is characterized in that the laser driver is high speed electricity Stream switch, for inputting modulation electric current for the laser.

3. a kind of light transmit-receive integrated component as described in claim 1, which is characterized in that the laser is corresponding with threshold value electricity Stream；

Further include power automatic controller in the CMOS asic chips；

The laser driver is the laser by the power automatic controller under the control of the microcontroller The DC bias current more than the threshold current is provided, so that the laser can stablize average light under different temperatures environment Laser is exported under power.

4. a kind of light transmit-receive integrated component as described in claim 1, which is characterized in that the laser driver is used for straight Stream bias current is monitored, and carries out fault warning.

5. a kind of light transmit-receive integrated component as described in claim 1, which is characterized in that the photodetector will be for that will pass through The signal from optical fiber that wave-division multiplexer filter receives is converted to analog current signal.

6. a kind of light transmit-receive integrated component as claimed in claim 5, which is characterized in that the trans-impedance amplifier will come from described The analog current signal of photodetector is converted, and analog voltage signal is generated.

7. a kind of light transmit-receive integrated component as described in claim 1, which is characterized in that also wrapped in the CMOSASIC chips It includes：The temperature sensor that the temperature of the laser is monitored.

8. a kind of light transmit-receive integrated component as described in claim 1, which is characterized in that also wrapped in the CMOSASIC chips It includes：It carries out current control and automatically controls gain circuitry with voltage-controlled.