Optical waveguides – With disengagable mechanical connector – Optical fiber to a nonfiber optical device connector
Reexamination Certificate
2000-04-11
2003-03-04
Bovernick, Rodney (Department: 2874)
Optical waveguides
With disengagable mechanical connector
Optical fiber to a nonfiber optical device connector
C385S049000, C385S045000
Reexamination Certificate
active
06527454
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an optical module used for the reception and transmission of a light signal in an optical communication.
2. Description of Related Art
FIG. 11
is an upper view showing an optical configuration of a transmission-reception unity type of optical module corresponding to a first prior art. A travelling direction of each light signal is indicated by arrows.
As shown in
FIG. 11
, an optical module is composed of a for-transmission laser diode
102
(sometimes called LD) for outputting a transmission-light signal of a 1.3 &mgr;m wavelength band;
an optical fiber
103
for receiving a reception-light signal of a 1.5 &mgr;m wavelength band from an outside and transmitting the transmission-light signal output from the for-transmission laser diode
102
to the outside;
an optical waveguide
101
, having a first end surface
101
a
facing on both the for-transmission laser diode
102
and the optical fiber
103
and a second end surface
101
b
, for transmitting the transmission-light signal output from the for-transmission laser diode
102
and the reception-light signal output from the optical fiber
103
; and
a for-reception photodiode
105
(sometimes called PD), acing on the second end surface
101
b
of the optical waveguide
101
, for receiving the reception-light signal transmitting through the optical waveguide
101
.
The optical waveguide
101
is composed of a first core
112
, of which one end faces on the for-reception laser diode
102
, for transmitting the transmission-light signal of the 1.3 &mgr;m wavelength band output from the for-transmission laser diode
102
;
a second core
113
, of which one end faces on the optical fiber
103
and of which the other end is connected with the other end of the first core
112
at a connection point
115
, for transmitting the reception-light signal received in the optical fiber
103
;
a wavelength division multiplexing (WDM) filter
104
, which is arranged in a groove formed in the optical waveguide
101
and on which the connection point
115
is positioned, for imperfectly reflecting the transmission-light signal transmitting through the first core
112
to the second core
113
to transmit the transmission-light signal to the outside through the second core
113
and the optical fiber
103
and passing the reception-light signal transmitting through the second core
113
and a portion of the transmission-light signal transmitting through the first core
112
;
a third core
114
, of which one end faces on the other ends of the first and second cores
112
and
113
and the other end
114
a
faces on the for-reception photodiode
105
, for transmitting the reception-light signal and the portion of the transmission-light signal passing through the WDM filter
104
and sending the reception-light signal and the portion of the transmission-light signal to the for-reception photodiode
105
; and
a cladding body
116
surrounding the first core
112
, the second core
113
, the third core
114
and the WDM filter
104
.
The for-reception PD
105
is positioned on a prolonged line of the third core
114
and is arranged in the neighborhood of the end
114
a
of the third core
114
. The end
114
a
of the third core
114
denotes a light outputting position from which the reception-light signal transmitting through the second core
113
and passing through the WDM filter
104
are output.
In the above configuration, an operation of the optical module is described.
A transmission-light signal of a 1.3 &mgr;m wavelength band emitted from the for-transmission LD
102
transmits through the first core
112
and is reflected by the WDM
104
to the second core
113
, and the transmission-light signal is coupled with the optical fiber
103
. Therefore, the transmission-light signal is output to the outside.
Also, a reception-light signal of a 1.5 &mgr;m wavelength band, which is transmitted from the outside and is received in the optical fiber
103
, transmits through the second and third cores
113
and
114
while passing through the WDM filter
104
, and the reception-light signal is detected in the for-reception PD
105
.
Therefore, an optical communication can be performed between the side of the optical module and the outside.
In this case, because the transmission-light signal is not perfectly reflected by the WDM
104
, a portion of the reception-light signal undesirably passes through the WDM
104
and the third core
114
and is detected in the for-reception PD
105
.
FIG. 12
is an upper view showing an optical configuration of a transmission-reception unity type of optical module corresponding to a second prior art. A travelling direction of each light signal is indicated by arrows.
As shown in
FIG. 12
, an optical module is composed of a for-transmission laser diode
122
(sometimes called LD) for outputting a transmission-light signal of a 1.3 &mgr;m wavelength band;
an optical fiber
123
for receiving a reception-light signal of a 1.5 &mgr;m wavelength band from an outside and transmitting the transmission-light signal output from the for-transmission laser diode
122
to the outside;
an optical waveguide
121
, having a first end surface
121
a
facing on both the for-transmission laser diode
122
and the optical fiber
123
and a second end surface
121
b
, for transmitting the transmission-light signal output from the for-transmission laser diode
122
and the reception-light signal output from the optical fiber
123
; and
a for-reception photodiode
125
(sometimes called PD), facing on the second end surface
121
b
of the optical waveguide
121
, for receiving the reception-light signal transmitting through the optical waveguide
121
.
The optical waveguide
121
is composed of a first core
132
, of which one end faces on the for-reception laser diode
122
, for transmitting the transmission-light signal of the 1.3 &mgr;m wavelength band output from the for-transmission laser diode
122
;
a second core
133
, of which one end faces on the optical fiber
123
and of which the other end is connected with the other end of the first core
132
at a connection point
134
, for transmitting the reception-light signal received in the optical fiber
123
;
a WDM filter
124
, which is arranged on the second end surface
121
b
of the optical waveguide
121
and on which the connection point
134
is positioned, for imperfectly reflecting the transmission-light signal transmitting through the first core
132
to the second core
133
to transmit the transmission-light signal to the outside through the second core
133
and the optical fiber
123
and passing the reception-light signal transmitting through the second core
133
and a portion of the transmission-light signal transmitting through the first core
132
; and
a cladding body
135
surrounding the first core
132
, the second core
133
and the WDM filter
124
.
The for-reception PD
125
is positioned on a prolonged line of the second core
133
and is arranged in the neighborhood of the connection point
134
connecting the first and second cores
132
and
133
. The connection point
134
denotes a light outputting position from which the reception-light signal transmitting through the second core
133
and passing through the WDM filter
124
are output.
In the above configuration, an operation of the optical module corresponding to the second prior art is described.
A transmission-light signal of a 1.3 &mgr;m wavelength band emitted from the for-transmission LD
122
transmits through the first core
132
and is reflected by the WDM
124
to the second core
133
, and the transmission-light signal is coupled with the optical fiber
123
. Therefore, the transmission-light signal is output to the outside.
Also, a reception-light signal of a 1.5 &mgr;m wavelength band, which is transmitted from the outside and is received in the optical fiber
123
, transmits through the second core
133
and the WDM filter
124
, and the reception-light signal is detected in the for-reception PD
Kaneko Shinichi
Saito Takeshi
Bovernick Rodney
Kang Juliana K.
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