Bi-directional optical transceiver module with double caps and method of improving the efficiency and the reliability of same

• US 20040071413A1
• Filed: 08/12/2003
• Published: 04/15/2004
• Est. Priority Date: 10/10/2002
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Tsumori, Masahiko
• Granted Patent: US 7,093,988 B2
• Time in Patent Office: Days
• US Class Current: 385/93
• CPC Class Codes: G02B 6/4201 Packages, e.g. shape, construction, internal or external details
• CPC Class Codes: G02B 6/4204 the coupling comprising intermediate optical elements, e.g. lenses, holograms encapsulated active devices H01S5/02208, H01L33/52
• CPC Class Codes: G02B 6/4214 the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device G02B6/4246 takes precedence
• CPC Class Codes: G02B 6/4246 Bidirectionally operating package structures
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate

Abstract

The disclosed invention relates to a bi-directional optical transceiver module and method of improving the efficiency and reliability of the same, where interference from optical crosstalk and electromagnetic waves are minimized and a wavelength division multiplexing filter can be easily mounted at a predetermined inclination angle, thereby improving the efficiency and reliability of the bi-directional optical transceiver module.

Claims

1. A bi-directional optical transceiver module comprising:

an optical waveguide element through which input and output optical signals pass through;

a lens holder in an upper end of which the optical waveguide element is inserted and fixed, the lens holder thereby serving as a body tube;

a lens disposed at an upper portion in the lens holder, the lens converging each of the input and output optical signals;

a stem supporting a lower end of the lens holder;

an outer cap disposed on the stem, the outer cap enclosing a photodiode for receiving an optical input signal and converting it to an electrical signal, a semiconductor laser that modulates the electrical signal into an optical output signal, and a wavelength division multiplexing filter; and

,

an inner cap mounted in the outer cap that further isolates the photodiode.

2. The apparatus as claimed in claim 1, the lens is a non-spherical lens.

3. The apparatus as claimed in claim 1, the lens is a spherical lens.

4. The apparatus as claimed in claim 1, wherein the wavelength division multiplexing filter is placed at a predetermined inclination angle at a location where the optical input and output signals intersect one another.

5. The apparatus as claimed in claim 4, wherein the inner cap has an inclined section extending at an inclination angle equal to the inclination angle of the wavelength division multiplexing filter, with the wavelength division multiplexing filter placed on the inclined section of the inner cap.

6. The apparatus as claimed in claim 5, wherein the inner cap is constructed of a material capable of preventing electromagnetic waves from penetrating.

7. The apparatus as claimed in claim 6, wherein the inner cap encloses the photodiode, thereby preventing scattered light and diffusion-reflected light from being introduced into the photodiode.

8. A bi-directional optical transceiver module comprising:

an optical fiber through which input and output optical signals pass through;

a lens holder in an upper end of which the optical fiber is inserted and fixed for serving as a body tube;

a lens disposed at an upper portion in the lens holder, the lens converging each of the input and output optical signals;

a stem supporting a lower end of the lens holder;

an outer cap disposed on the stem, the outer cap enclosing a photodiode for receiving an optical input signal and covering it to an electrical signal, a semiconductor laser that modulates the electrical signal into an optical output signal, and a wavelength division multiplexing filter; and

,

an inner cap mounted in the outer cap constructed of a material capable of withstanding electromagnetic waves from penetrating, the inner cap further encapsulating the photodiode preventing scattered light and diffusion-reflected light from being introduced into the photodiode.

9. The apparatus as claimed in claim 8, wherein the wavelength division multiplexing filter is placed at a predetermined inclination angle at a location where the optical input and output signals intersect one another.

10. The apparatus as claimed in claim 9, wherein the inner cap has an inclined section extending at an inclination angle equal to the inclination angle of the wavelength division multiplexing filter, with the wavelength division multiplexing filter placed on the inclined section of the inner cap.

11. A method of receiving optical input signals and transmitting optical output signals in a bi-directional optical transceiver module, the method comprising the step of:

further encapsulating a photodiode with an inner cap that prevents scattered light and diffusion-reflected light from being introduced into the photodiode.

12. The method according to claim 11, wherein the inner cap further prevents the penetration of electromagnetic waves by being constructed of a material capable of doing so.

13. The method according to claim 12, further providing an inclined portion of the inner cap for quickly mounting a wavelength division multiplexing filter at the same inclined angle.