CN214097890U

CN214097890U - Single-fiber bidirectional optical device and optical communication device suitable for high-speed long-distance transmission

Info

Publication number: CN214097890U
Application number: CN202120069459.2U
Authority: CN
Inventors: 陈水生; 林桂光; 司马卫武
Original assignee: Hunan Guangzhi Communication Technology Co ltd
Current assignee: Hunan Guangzhi Communication Technology Co ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2021-08-31
Anticipated expiration: 2031-01-11

Abstract

The utility model discloses a two-way optical device of single fiber suitable for high-speed long distance transmission, including casing, light emitter, photoreceiver and adapter. The light emitter comprises a first tube seat, an EML laser, a TEC, a thermistor, a backlight detector, seven pins, a first tube cap and a first lens arranged on the top of the first tube cap. The pin LD +, the pin EMA +, the anode of the TEC, the cathode of the TEC, the anode of the thermistor and the anode of the backlight detector of the EML laser are respectively and correspondingly electrically connected with a pin, the EML laser has an electro-absorption modulation function, the pin EMA + of the EML laser is independently connected with one pin, modulation is realized through the pin EMA +, and the EML laser can be suitable for high-speed long-distance transmission; meanwhile, refrigeration is realized through the integrated TEC. Pins LD-, EMA-, the negative pole of the thermistor and the negative pole of the backlight detector of the EML laser are electrically connected to the grounding pin, and the setting of the pins is simplified and the number of the pins is reduced by sharing the grounding pin. Additionally, the utility model also discloses an optical communication device.

Description

Single-fiber bidirectional optical device and optical communication device suitable for high-speed long-distance transmission

Technical Field

The utility model relates to an optical communication technical field especially relates to a two-way optical device of single fiber and optical communication device suitable for high-speed long distance transmission.

Background

Optical fiber communication has been developed as one of the main communication methods because of its advantages of large communication capacity, long transmission distance, and strong anti-electromagnetic interference capability. A single-fiber bidirectional optical device (BOSA for short) is a photoelectric conversion device integrating transmission and reception, can realize the function of bidirectional transmission of data in a single optical fiber, and is an important device applied to an optical communication system.

The emergence and development of emerging services such as ultra-high definition video, cloud computing, internet of things and the like enable the requirement of user bandwidth to increase rapidly, and the requirement of supporting single-fiber bidirectional optical devices with higher speed such as 25G/100G is more and more urgent. In the prior art, a 4PIN DFB (distributed feedback laser) structure is adopted at a transmitting end of a single-fiber bidirectional optical device, the function is single, MPD +, LD + and LD-are respectively connected with a PIN correspondingly, and MPD-and GND share a PIN (MPD-and GND are connected to the same PIN); the receiving end adopts a 5PIN TIA (trans impedance amplifier) structure. The method is only suitable for BOSA short-distance 20KM transmission application below 4G, and cannot meet the application requirement of high-speed 10G or 25G long-distance transmission.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a two-way optical device of single fiber suitable for high-speed long distance transmission.

Another object of the present invention is to provide an optical communication device suitable for high-speed long-distance transmission.

In order to achieve the above objects, the present invention provides a single-fiber bidirectional optical device suitable for high-speed long-distance transmission, comprising a housing, an optical transmitter, an optical receiver and an adapter mounted on the housing, the light emitter comprises a first tube seat, an EML laser, a TEC, a thermistor, a backlight detector, seven pins, a first tube cap and a first lens, wherein the EML laser, the TEC, the thermistor and the backlight detector are arranged on the first tube seat, the seven pins are inserted and fixed on the first tube seat, the first tube cap is sleeved on the upper part of the first tube seat, the first lens is arranged at the top of the first tube cap, a pin LD + of the EML laser, a pin EMA + of the TEC, a positive pole of the TEC, a negative pole of the TEC, a positive pole of the thermistor and a positive pole of the backlight detector are respectively and correspondingly electrically connected with the pin, and a pin LD-, a pin EMA-of the EML laser, a negative electrode of the thermistor and a negative electrode of the backlight detector are electrically connected to the grounding pin.

Preferably, three pins which are respectively and correspondingly electrically connected with the anode of the TEC, the cathode of the TEC and the anode of the backlight detector are transversely arranged in front of the EML laser side by side, two pins which are respectively and correspondingly electrically connected with the anode of the thermistor and the pin LD + of the EML laser are longitudinally arranged in the left side of the EML laser side by side, and one pin which is electrically connected with the pin EMA + of the EML laser is longitudinally arranged in the right side of the EML laser side by side with the grounding pin.

Preferably, the upper surface of the first tube seat is provided with a binding post, the binding post is positioned at the rear side of a pin arranged on the right side of the EML laser, the pin LD-, the pin EMA-, the negative electrode of the thermistor and the negative electrode of the backlight detector are electrically connected with the binding post, and the bottom of the binding post is electrically connected with the grounding pin; and a metal coating is formed on the front side surface of the binding post, and the metal coating is electrically connected with the pin EMA + and is in eutectic welding with the pin arranged on the right side of the EML laser.

Preferably, the TEC is horizontally disposed on the upper surface of the first tube holder, the light emitter further includes a heat sink, the heat sink includes a first heat dissipation portion fixed on the upper surface of the TEC and a second heat dissipation portion vertically disposed on the first heat dissipation portion, the thermistor and the backlight detector are disposed on the first heat dissipation portion, a spacer is disposed on a sidewall of the second heat dissipation portion, the EML laser is disposed on the spacer, and a light exit surface of the EML laser faces the first lens.

Preferably, the upper surface of the first heat sink member is an inclined surface inclined downward from a side close to the second heat sink member, and the thermistor and the backlight detector are disposed on the upper surface of the first heat sink member.

Preferably, the heat sink is made of copper.

Preferably, the light emitter still includes coaxial cover and establishes the sleeve of the outside of first pipe cap, the light hole that leads to that exposes first lens is seted up to the telescopic roof, just telescopic roof still is equipped with the flange, the flange form with lead to the light hole intercommunication and just right lead to the chamber of acceping of light hole, it is equipped with optical isolator to accept the chamber.

Preferably, the optical receiver includes a second tube seat, a TIA chip and a PD chip mounted on the second tube seat, five pins inserted and fixed on the second tube seat, a second tube cap sleeved on the upper portion of the second tube seat, and a second lens disposed on the top of the second tube cap.

Preferably, the housing has a first coupling end and a second coupling end that are opposite to each other, and a third coupling end that is perpendicular to the first coupling end and the second coupling end, the optical transmitter is coupled to the first coupling end, the adapter is coupled to the second coupling end, and the optical receiver is coupled to the third coupling end.

In order to achieve the above another object, the present invention provides an optical communication apparatus, including the single-fiber bidirectional optical device suitable for high-speed long-distance transmission as described above.

Compared with the prior art, the light emitter of the utility model adopts the electric absorption modulator and the high-speed DFB laser to integrate the EML laser packaged by the EML, the EML laser has the electric absorption modulation function, the pin EMA + of the EML laser is independently connected with a pin, the modulation is realized through the pin EMA +, and the light emitter can be suitable for high-speed long-distance transmission; meanwhile, refrigeration is realized through the integrated TEC, the anode of the TEC and the cathode of the TEC are respectively and correspondingly connected with a pin, and the influence on the output wavelength of the EML laser chip caused by overhigh temperature is avoided, so that the stability of the output wavelength is ensured, and the integrated TEC can be applied to a DWDM system. In addition, the pins LD-, EMA-, the negative electrode of the thermistor and the negative electrode of the backlight detector of the EML laser share the grounding pin, so that the setting of the pins can be simplified and the number of the pins can be reduced. Additionally, the utility model discloses a single fiber realizes transmission and receipt, can practice thrift the optic fibre cost.

Drawings

Fig. 1 is a schematic structural diagram of a single-fiber bidirectional optical device suitable for high-speed long-distance transmission according to an embodiment of the present invention.

Fig. 2 is an exploded schematic view of fig. 1.

Fig. 3 is a perspective cross-sectional view of the single fiber bi-directional optical device shown in fig. 1.

Fig. 4 is a plan cross-sectional view of the single fiber bi-directional optical device shown in fig. 1.

Fig. 5 is a partial structural schematic diagram of a light emitter.

Detailed Description

In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

In the description of the present invention, it should be understood that the terms "horizontal", "longitudinal", "left side", "right side", "front side", "top", "bottom", "outer", "horizontal", "vertical", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of description and simplification of description, and thus, the limitation of the protection of the present invention is not understood.

Referring to fig. 1 to 5, the present invention discloses a single-fiber bidirectional optical device 100, which is suitable for high-speed long-distance transmission. The bidirectional optical single-fiber device 100 includes a housing 1, an optical transmitter 2, an optical receiver 3, and an adapter 4 mounted on the housing 1. The housing 1 has an accommodating cavity 11, two first coupling ends 12 and two second coupling ends 13 opposite to each other, and a third coupling end 14 perpendicular to the first coupling ends 12 and the second coupling ends 13, wherein the first coupling ends 12, the second coupling ends 13, and the third coupling ends 14 are communicated with the accommodating cavity 11. The optical transmitter 2 is coupled to the first coupling end 12, the adapter 4 is coupled to the second coupling end 13, and the optical receiver 3 is coupled to the third coupling end 14 (as shown in fig. 1 and 2). A mounting seat 15 is arranged in the accommodating cavity 11, and a filter plate 16 (shown in fig. 4) is arranged on the mounting seat 15.

The light emitter 2 comprises a first tube holder 211, an EML laser 22 mounted on the first tube holder 211, a TEC23, a thermistor 24, a backlight detector 25, seven

pins

261 and 267 inserted and fixed on the first tube holder 211, a first tube cap 212 sleeved on the upper portion of the first tube holder 211, and a first lens 27 arranged on the top of the first tube cap 212, wherein pins LD +, EMA +, and the anode of the TEC23 of the EML laser 22, the cathode of the TEC23, the anode of the thermistor 24, and the anode of the backlight detector 25 are respectively and electrically connected with the

pins

261 and 266, and the pins LD-, EMA-, the cathode of the thermistor 24, and the cathode of the backlight detector 25 of the EML laser 22 are electrically connected to a grounding pin 267 (as shown in fig. 5).

The optical receiver 3 includes a second stem 31, a TIA chip (transimpedance amplifier) (not shown) and a PD chip (not shown) mounted on the second stem 31, five pins 32 inserted and fixed on the second stem 31, a second cap 33 sleeved on the upper portion of the second stem 31, and a second lens 34 arranged on the top of the second cap 33, wherein the second cap 33 is inserted and fixed on the third coupling end 14 (shown in fig. 1 and 3). In this embodiment, the PD chip is a 10G APD receiving chip, and the sensitivity is high.

In the embodiment shown in fig. 1 to 5, the light emitter 2 further includes a sleeve 213 coaxially covering the first cap 212, a top wall of the sleeve 213 is provided with a light passing hole 2130 exposing the first lens 27, a top wall of the sleeve 213 is further provided with a flange 2131, the flange 2131 forms a receiving cavity 2132 communicating with the light passing hole 2130 and facing the light passing hole 2130, and the receiving cavity 2132 is provided with the optical isolator 28 (as shown in fig. 3).

As shown in fig. 5, three

pins

261 and 263 electrically connected to the anode of the TEC23, the cathode of the TEC23, and the anode of the backlight detector 25 respectively are transversely arranged in parallel on the front side of the EML laser 22, two

pins

264 and 265 electrically connected to the pin LD + of the EML laser 22 and the anode of the thermistor 24 respectively are longitudinally arranged in parallel on the left side of the EML laser 22, and one pin 266 electrically connected to the pin EMA + of the EML laser 22 and the ground pin 267 are longitudinally arranged in parallel on the right side of the EML laser 22. Further, the upper surface of the first socket 211 is provided with a terminal 214, the terminal 214 is located at the rear side of a pin 266 arranged at the right side of the EML laser 22, the pins LD-, EMA-, the negative electrode of the thermistor 24 and the negative electrode of the backlight detector 25 are electrically connected with the terminal 214 through conducting wires, and the bottom of the terminal 214 is electrically connected with a grounding pin 267. A metal plating layer 2141 is formed on the front side surface (the side surface facing the direction of the mounting plane of the EML laser 22) of the post 214, and the metal plating layer 2141 is electrically connected to the pin EMA + by a wire and eutectic-welded to the pin 266 provided on the right side of the EML laser 22.

As shown in fig. 4 and 5, the TEC23 is horizontally disposed on the upper surface of the first stem 211, the light emitter 2 further includes a heat sink 29, the heat sink 29 includes a first heat sink portion 291 fixed on the upper surface of the TEC23 and a second heat sink portion 292 vertically disposed on the first heat sink portion 291, the thermistor 24 and the backlight detector 25 are disposed on the first heat sink portion 291, a spacer 293 is disposed on a sidewall of the second heat sink portion 292, the EML laser 22 is disposed on the spacer 293, and a light emitting surface of the EML laser 22 faces the first lens 27 (as shown in fig. 4). The EML laser 22 is vertically mounted, a reflector is not needed for light path reflection, coupling efficiency is high, and reflector cost is saved. Meanwhile, rapid heat dissipation is further achieved by the heat sink 29. In the embodiment shown in fig. 5, the upper surface of the first heat sink member 291 is an inclined surface inclined downward from the side close to the second heat sink member 292, and the thermistor 24 and the backlight detector 25 are provided on the upper surface of the first heat sink member 291. Preferably, the heat sink 29 is made of copper, which has a good heat dissipation effect, but should not be limited thereto.

The utility model discloses a theory of operation does: the optical transmitter 2 is powered up, the 10G EML laser 22 modulates through electro-absorption, converts the electrical signal into an optical signal, isolates the clutter through the optical isolator 28, then transmits the optical signal through the filter 16, and finally transmits the optical signal out through the optical fiber. The optical receiver 3 transmits an external optical signal to the 10G PD chip through an optical fiber, then amplifies the optical signal through the TIA chip, converts the optical signal into an electrical signal, and finally converts the electrical signal into high and low electrical frequency to be transmitted.

Compared with the prior art, the light emitter 2 of the utility model adopts the electric absorption modulator and the high-speed DFB laser to integrate the EML laser 22 packaged by the EML, the EML laser 22 has the electric absorption modulation function, the pin EMA + of the EML laser is independently connected with the pin 266, and the modulation is realized through the pin EMA +, so that the light emitter can be suitable for the transmission of high-speed 10G or 25G long-distance 80KM or 120 KM; meanwhile, the light emitter 2 realizes refrigeration through the integrated TEC23, the anode of the TEC23 and the cathode of the TEC23 are correspondingly connected with the

pins

261 and 262 respectively, and the influence on the output wavelength of the EML laser 22 due to overhigh temperature is avoided, so that the stability of the output wavelength is ensured, and the integrated TEC light emitter 2 can be suitable for DWDM systems. Furthermore, the pins LD-, EMA-, and the cathode of the thermistor 24 of the EML laser 22 and the cathode of the backlight detector 25 share the ground pin 267, which can simplify the arrangement of the pins and reduce the number of pins. Additionally, the utility model discloses the integration has parts such as light isolator 28, filter 16, and the isolation is good, and the integrated level is high. Furthermore, because the utility model discloses a single fiber realizes transmission and receipt, can practice thrift the optic fibre cost.

The above disclosure is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereto, and therefore, the scope of the present invention is not limited to the above embodiments.

Claims

1. A single-fiber bidirectional optical device suitable for high-speed long-distance transmission is characterized by comprising a shell, an optical transmitter, an optical receiver and an adapter which are arranged on the shell, the light emitter comprises a first tube seat, an EML laser, a TEC, a thermistor, a backlight detector, seven pins, a first tube cap and a first lens, wherein the EML laser, the TEC, the thermistor and the backlight detector are arranged on the first tube seat, the seven pins are inserted and fixed on the first tube seat, the first tube cap is sleeved on the upper part of the first tube seat, the first lens is arranged at the top of the first tube cap, a pin LD + of the EML laser, a pin EMA + of the TEC, a positive pole of the TEC, a negative pole of the TEC, a positive pole of the thermistor and a positive pole of the backlight detector are respectively and correspondingly electrically connected with the pin, and a pin LD-, a pin EMA-of the EML laser, a negative electrode of the thermistor and a negative electrode of the backlight detector are electrically connected to the grounding pin.

2. The single-fiber bidirectional optical device suitable for high-speed long-distance transmission according to claim 1, wherein three pins electrically connected with the anode of the TEC, the cathode of the TEC, and the anode of the backlight detector respectively are arranged laterally side by side on the front side of the EML laser, two pins electrically connected with the anode of the thermistor and the pin LD + of the EML laser respectively are arranged longitudinally side by side on the left side of the EML laser, and one pin electrically connected with the pin EMA + of the EML laser and the ground pin are arranged longitudinally side by side on the right side of the EML laser.

3. The single-fiber bidirectional optical device suitable for high-speed long-distance transmission according to claim 2, wherein the upper surface of the first tube holder is provided with a binding post, the binding post is located at the rear side of a pin arranged at the right side of the EML laser, the pin LD-, the pin EMA-, the cathode of the thermistor and the cathode of the backlight detector are electrically connected with the binding post, and the bottom of the binding post is electrically connected with the grounding pin; and a metal coating is formed on the front side surface of the binding post, and the metal coating is electrically connected with the pin EMA + and is in eutectic welding with the pin arranged on the right side of the EML laser.

4. The single-fiber bidirectional optical device suitable for high-speed long-distance transmission as claimed in claim 1, wherein the TEC is horizontally disposed on the upper surface of the first base, the optical transmitter further comprises a heat sink, the heat sink comprises a first heat dissipation portion fixed on the upper surface of the TEC and a second heat dissipation portion vertically disposed on the first heat dissipation portion, the thermistor and the backlight detector are disposed on the first heat dissipation portion, a spacer is disposed on a sidewall of the second heat dissipation portion, the EML laser is disposed on the spacer, and a light emitting surface of the EML laser faces the first lens.

5. The single-fiber bidirectional optical device suitable for high-speed long-distance transmission according to claim 4, wherein the upper surface of the first heat sink member is an inclined surface inclined downward from a side close to the second heat sink member, and the thermistor and the backlight detector are disposed on the upper surface of the first heat sink member.

6. The single fiber bi-directional optical device suitable for high speed long distance transmission of claim 4, wherein the heat sink is copper metal.

7. The single-fiber bidirectional optical device suitable for high-speed long-distance transmission according to claim 1, wherein the optical transmitter further comprises a sleeve coaxially covering the first cap, a top wall of the sleeve is provided with a light-transmitting hole exposing the first lens, and a top wall of the sleeve is further provided with a flange forming a receiving cavity communicating with the light-transmitting hole and facing the light-transmitting hole, and the receiving cavity is provided with an optical isolator.

8. The single-fiber bidirectional optical device suitable for high-speed long-distance transmission according to claim 1, wherein the optical receiver comprises a second stem, a TIA chip and a PD chip mounted on the second stem, five pins inserted and fixed on the second stem, a second cap covering an upper portion of the second stem, and a second lens disposed on a top portion of the second cap.

9. The single-fiber bidirectional optical device suitable for high-speed long-distance transmission according to claim 1, wherein the housing has a first coupling end and a second coupling end that are opposite to each other, and a third coupling end perpendicular to the first coupling end and the second coupling end, the optical transmitter is coupled to the first coupling end, the adapter is coupled to the second coupling end, and the optical receiver is coupled to the third coupling end.

10. An optical communication apparatus comprising the single-fiber bidirectional optical device suitable for high-speed long-distance transmission according to any one of claims 1 to 9.