Pluggable optical transceiver

1. A pluggable optical transceiver comprising:

a top housing;

a bottom housing; and

an optical-electrical assembly enclosed by the top housing and the bottom housing, the optical-electrical assembly comprising:

a substrate;

at least a transmitting optoelectronic component disposed on the substrate;

at least a receiving optoelectronic component disposed on the substrate;

interface integrated circuits disposed on the substrate;

a pluggable electrical interface disposed on the substrate and electrically connected with the interface integrated circuits; and

a coupling optical system comprising an external pluggable optical interface, a coupling optical element fixedly mounted on the substrate, and a light-guiding structure optically connecting the external pluggable optical interface and the coupling optical element; wherein:

the coupling optical element is configured to couple a first optical signal from the transmitting optoelectronic component to the light-guiding structure, and to couple a second optical signal from the light-guiding structure to the receiving optoelectronic component;

the light-guiding structure is configured to couple the first optical signal to the external pluggable optical interface, and to couple the second optical signal from the external pluggable optical interface; and

the external pluggable optical interface is configured to couple the first optical signal to an external transmitting optical fiber, and to couple the second optical signal from a receiving fiber.

2. The pluggable optical transceiver of claim 1 , wherein the light-guiding structure comprises a plurality of reflecting surfaces, the external pluggable optical interface comprises a transmitting port and a receiving port, and the reflecting surfaces are configured to couple the first optical signal to the transmitting port, and to couple the second optical signal from the receiving port.

3. The pluggable optical transceiver of claim 2 , wherein the transmitting optoelectronic component is a VCSEL, the receiving optoelectronic component is a photodiode, and the transmitting optoelectronic component and the receiving optoelectronic component are mounted on the substrate with a spacing of less than 1 mm.

4. The pluggable optical transceiver of claim 1 , wherein the interface integrated circuits comprise a transmitter driver circuit and a receiver circuit, the transmitter driver circuit is electrically connected to and placed in close proximity to the transmitting optoelectronic component by a distance less than 1 mm.

5. The pluggable optical transceiver of claim 4 , wherein the receiver circuit is electrically connected to and placed in close proximity to the receiving optoelectronic component by a distance less than 1 mm.

6. The pluggable optical transceiver of claim 4 , wherein the transmitter driver circuit and the receiver circuit are integrated onto one single chip.

7. The pluggable optical transceiver of claim 3 , wherein the pitch between the transmitting port and the receiving port is larger than the pitch of the VCSEL and the photodiode disposed on the substrate.

8. The pluggable optical transceiver of claim 7 , wherein the pitch between the transmitting port and the receiving port is in compliance with the SFP/SFP+ MSA standards.

9. The pluggable optical transceiver of claim 1 , wherein the coupling optical element is bonded onto the substrate and defines a cavity that accommodates the transmitting optoelectronic component, the receiving optoelectronic component and the interface integrated circuits.

10. The pluggable optical transceiver of claim 1 , wherein the light-guiding structure comprises a pair of jumper fibers optically connecting the external pluggable optical interface and the coupling optical element, the pair of jumper fibers comprising a transmitting jumper fiber and a receiving jumper fiber.

11. The pluggable optical transceiver of claim 10 , wherein the jumper fibers are bent by about 90 degrees to directly couple an optical signal from the transmitting optoelectronic component.

12. The pluggable optical transceiver of claim 1 , wherein the light-guiding structure comprises a flexible waveguide substrate being optically connected with the external pluggable optical interface.

13. The pluggable optical transceiver of claim 10 , wherein the light-guiding structure further comprises a jumper plug configured for mechanically fixing the position of the jumper fibers to match the pitch of the transmitting optoelectronic component and the receiving optoelectronic component, the jumper fibers being terminated at an end facet of the jumper plug.

14. The pluggable optical transceiver of claim 1 , wherein the top housing and the bottom housing are made of metal.

15. The pluggable optical transceiver of claim 1 further comprising a top metal shield and a bottom metal shield, wherein the top metal shield and the bottom metal shield enclose the coupling optical element and the substrate, the top housing and the bottom housing being made of a non-conductive moldable material.

16. The pluggable optical transceiver of claim 1 , wherein the coupling optical system is formed as one single molded optical element.

17. The pluggable optical transceiver of claim 13 , wherein the coupling optical element further comprises a latching element being fixed with the substrate, the jumper plug being detachably engaged with the coupling optical element, the latching element being configured to prevent the jumper plug from disengaging from the coupling optical element.

18. A small form factor pluggable optical transceiver comprising:

a top housing;

a bottom housing; and

an optical-electrical assembly enclosed by the top housing and the bottom housing, the optical-electrical assembly comprising:

a substrate;

at least a transmitting optoelectronic component disposed on the substrate;

at least a receiving optoelectronic component disposed on the substrate;

interface integrated circuits disposed on the substrate;

a pluggable electrical interface disposed on the substrate and electrically connected with the interface integrated circuits; and

a coupling optical system comprising an external pluggable optical interface, a coupling optical element fixedly mounted on the substrate, and a light-guiding structure optically connecting the external pluggable optical interface and the coupling optical element; wherein:

the coupling optical system is configured to couple a first optical signal originated from the transmitting optoelectronic component to the external pluggable optical interface and guide a second optical signal received at the external pluggable optical interface to the receiving optoelectronic component;

the coupling optical element is bonded onto the substrate and defines a cavity that accommodates the transmitting optoelectronic component, the receiving optoelectronic component and the interface integrated circuits; and

the top housing and the bottom housing are made of metal.

19. The small form factor pluggable optical transceiver of claim 18 , wherein the light-guiding structure comprises a pair of jumper fibers optically connecting the external pluggable optical interface and the coupling optical element, the pair of jumper fibers comprising a transmitting jumper fiber and a receiving jumper fiber.

20. A pluggable optical transceiver comprising:

a top housing;

a bottom housing; and

an optical-electrical assembly enclosed by the top housing and the bottom housing, the optical-electrical assembly comprising:

a substrate;

at least a transmitting optoelectronic component disposed on the substrate;

at least a receiving optoelectronic component disposed on the substrate;

interface integrated circuits disposed on the substrate;

a pluggable electrical interface disposed on the substrate and electrically connected with the interface integrated circuits; and

a coupling optical system comprising an external pluggable optical interface, a coupling optical element fixedly mounted on the substrate, and a light-guiding structure optically connecting the external pluggable optical interface and the coupling optical element; wherein:

the coupling optical element is configured to couple a first optical signal from the transmitting optoelectronic component to the light-guiding structure, and to couple a second optical signal from the light-guiding structure to the receiving optoelectronic component;

the light-guiding structure is configured to couple the first optical signal to the external pluggable optical interface, and to couple the second optical signal from the external pluggable optical interface;

the external pluggable optical interface is configured to couple the first optical signal to an external transmitting optical fiber, and to couple the second optical signal from a receiving fiber;

the interface integrated circuits comprise a transmitter driver circuit and a receiver circuit;

the transmitter driver circuit is electrically connected to and placed in close proximity to the transmitting optoelectronic component by a distance less than 1 mm;

the receiver circuit is electrically connected to and placed in close proximity to the receiving optoelectronic component by a distance less than 1 mm; and

the light-guiding structure comprises a flexible waveguide substrate being optically connected with the external pluggable optical interface.