Optical module

1. An optical module, comprising:

a circuit board comprising a groove disposed in a surface of the circuit board, wherein the groove is recessive along a height direction of the circuit board; and

a receiver comprising:

an arrayed waveguide grating on the circuit board;

a reflector in connection with the arrayed waveguide grating and on the circuit board; and

a Photo-Diode (PD) arrayed receiver chip on the circuit board, wherein the PD arrayed receiver chip electrically in connection with the circuit board, and is opposite to a part of a bottom surface of the reflector in the height direction of the circuit board;

wherein the arrayed waveguide grating is configured to receive an optical signal from an optical fiber, and the arrayed waveguide grating is arranged right above the groove and fixed in the groove, or arranged within the groove, such that a distance between the bottom surface of the reflector and the PD arrayed receiver chip is shortened.

2. The optical module according to claim 1 , further comprising a cover plate on a surface of the arrayed waveguide grating facing the surface of the circuit board, wherein the groove is configured to receive the cover plate.

3. The optical module according to claim 2 , wherein a width of the groove is same as a width of the cover plate.

4. The optical module according to claim 2 , wherein a width of the groove is slightly larger than a width of the cover plate.

5. The optical module according to claim 2 , further comprising a first compound, wherein the cover plate is fixed in the groove by the first compound.

6. The optical module according to claim 5 , further comprising a second compound, wherein the cover plate is fixed to the arrayed waveguide grating by the second compound.

7. The optical module according to claim 2 , wherein a width of the cover plate is same as a width of the arrayed waveguide grating.

8. The optical module according to claim 2 , wherein a width of the cover plate is slightly smaller than a width of the arrayed waveguide grating.

9. The optical module according to claim 2 , wherein a width of the cover plate is slightly larger than a width of the arrayed waveguide grating.

10. The optical module according to claim 2 , wherein a depth of the groove is same as a thickness of the cover plate.

11. The optical module according to claim 2 , wherein a depth of the groove is smaller than a thickness of the cover plate.

12. The optical module according to claim 1 , wherein the reflector is configured to receive the optical signal from the arrayed waveguide grating and reflect the optical signal towards the bottom surface of the reflector.

13. The optical module according to claim 1 , wherein the PD arrayed receiver chip is configured to receive the optical signal from the reflector and generate electrical signal according to the optical signal.

14. The optical module according to claim 1 , further comprising a protective shell above the arrayed waveguide grating and the reflector.

15. The optical module according to claim 1 , further comprising a compound, wherein the arrayed waveguide grating is fixed in the groove by the compound.

16. The optical module according to claim 1 , wherein:

the receiver further comprises reflector disposed above the circuit board and opposite to

the circuit board along the height direction of the circuit board; and

the reflector is configured to connect with the arrayed waveguide grating.

17. The optical module according to claim 16 , wherein the reflector is configured to receive the optical signal from the arrayed waveguide grating and reflect the optical signal towards a bottom surface of the reflector.

18. The optical module according to claim 16 , further comprising a protective shell above the arrayed waveguide grating and the reflector.