Optical transceiver module

Abstract

To provide an optical transmitter receiver module configured to respond to multiple frequency characteristics in a simple configuration.SOLUTION: An optical transmitter receiver module 100 for transmitting and receiving optical signals with a photoelectric element 200 includes a first signal line 110 which is connected to the photoelectric element 200 to transmit signals of first frequency. The optical transmitter receiver module 100 includes a second signal line 120 for transmitting signals of second frequency which is higher than the first frequency. The optical transmitter receiver module 100 further includes a first coupling transmission path 101 in which a part of the first signal line 110 and a part of the second signal line are separated at a predetermined distance and they are arranged in parallel at a predetermined distance in a longitudinal direction of the part of the first signal line. When signals of the second frequency are transmitted in one of the first signal line 110 or the second signal line 120 of the first coupling transmission path 101, the signals of the second frequency are transferred to the other one of the first signal line 110 or the second signal line 120 by crosstalk.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an optical transceiver module.

Background Art

[0002] Conventionally, in a wireless communication system, there are many cases where signals in a plurality of frequency bands are used, and techniques for multiplexing (combining) and distributing the signals in the plurality of frequency bands have been proposed. Patent Document 1 discloses an optical transmission system that frequency-converts a wireless signal and optically transmits it. The optical transmission system disclosed in Patent Document 1 generates signals having different frequencies for frequency conversion using a non-linear amplifier, a band-pass filter, and the like.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the optical transmission system disclosed in Patent Document 1, circuits such as a band-pass filter are required to multiplex and distribute signals of a plurality of frequencies. That is, it is necessary to provide a filter for each of the plurality of frequency bands handled by the optical transmission system, resulting in an increase in circuit scale and costs of filter members.

[0005] The present invention has been made in view of such problems of the prior art. An object of the present invention is to provide an optical transceiver module capable of corresponding to a plurality of frequency characteristics with a simple configuration.

Means for Solving the Problems

[0006] The optical transceiver module according to an aspect of the present invention is an optical transceiver module that transmits and receives an optical signal by an optoelectronic device, and includes a first signal line connected to the optoelectronic device and transmitting a signal of a first frequency, a second signal line transmitting a signal of a second frequency that is higher than the first frequency, and a coupled transmission path formed by a part of the first signal line and a part of the second signal line, wherein the part of the first signal line and the part of the second signal line are separated by a predetermined interval, and the part of the first signal line and the part of the second signal line are arranged in parallel in the longitudinal direction of the part of the first signal line at a predetermined distance, and when a signal of the second frequency is transmitted to either the first signal line or the second signal line of the first coupled transmission path, the signal of the second frequency transfers to the other first signal line or second signal line due to crosstalk in the first coupled transmission path.

Effects of the Invention

[0007] According to the present invention, it is possible to provide an optical transceiver module that can support a plurality of frequency characteristics with a simple configuration.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2A

Figure 2B

Figure 3A

Figure 3B

Figure 4A

Figure 4B

Figure 4C

Figure 5A

Figure 5B

Figure 5C

Figure 6A

Figure 6B

Figure 7A

Figure 7B

Figure 8A

Figure 8B

Figure 9A

Figure 9B

Embodiments for Carrying Out the Invention

[0009] Hereinafter, the optical transceiver module 100 according to the present embodiment will be described in detail with reference to the drawings. Note that the dimensional ratios in the drawings are exaggerated for convenience of explanation and may be different from the actual ratios. Also, in the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

[0010] (First Embodiment) (Configuration of Optical Transceiver Module 100) FIG. 1 is a diagram showing the configuration of an optical transceiver module 100 according to the first embodiment. As shown in FIG. 1, the optical transceiver module 100 includes a first signal line 110 and a second signal line 120. Further, the optical transceiver module 100 may include a power supply 111 and an inductor 112. Alternatively, chips of a laser driver or a transimpedance amplifier generally used in an optical transceiver may be arranged instead. In this specification, the case where the optical transceiver module 100 includes a power supply 111 and an inductor 112 will be described.

[0011] The optical transceiver module 100 transmits and receives optical signals via an optoelectronic device 200. The optoelectronic device 200 is a device that converts an optical signal and an electrical signal.

[0012] When the optical transceiver module 100 is used for transmitting an optical signal, the optoelectronic device 200 is configured as a light-emitting device that converts an electrical signal into an optical signal. The light-emitting device may be of any type, for example, a semiconductor laser or a light-emitting diode. Further, when the optical transceiver module 100 is used for receiving an optical signal, the optoelectronic device 200 is configured as a light-receiving device that converts an optical signal into an electrical signal, for example. The light-receiving device is, for example, a photodiode or a phototransistor.

[0013] The first signal line 110 is a signal line with one end connected to the optoelectronic device 200 and the other end connected to the device 300a. When the optical transceiver module 100 is used for transmitting an optical signal, the device 300a transmits a signal to the first signal line 110 and transmits the optical signal via the optoelectronic device 200. Also, when the optical transceiver module 100 is used for receiving an optical signal, the device 300a receives, via the optoelectronic device 200, a signal that has been converted from an optical signal to an electrical signal, receives the signal via the first signal line 110, and performs processing. Note that the device 300a may be an antenna for communicating with the outside. Also, in the first embodiment, the device 300a is provided outside the optical transceiver module 100. However, the position of the device 300a does not limit the embodiment, and the device 300a may be configured to be provided in the optical transceiver module 100. Note that the device 300a corresponds to the first device.

[0014] The first signal line 110 is a signal line for transmitting a signal with a low-frequency. Also, the first signal line 110 is, for example, a copper foil wiring pattern formed of a copper wire. Note that the frequency of the signal transmitted in the first signal line 110 is defined as the first frequency.

[0015] Also, the first signal line 110 is connected to the power supply 111 via the inductor 112. In the first embodiment, the power supply 111 is a direct current (DC) power supply for driving the optoelectronic device 200, and supplies power to the optoelectronic device 200 via the inductor 112. Also, the inductor 112 is used to prevent the signal flowing in the first signal line 110 from reaching the power supply 111.

[0016] The second signal line 120 is a signal line with one end connected to the device 300b. When the optical transceiver module 100 is used for transmitting an optical signal, the device 300b transmits a signal to the second signal line 120. Also, when the optical transceiver module 100 is used for receiving an optical signal, the device 300b processes the signal received via the second signal line 120. Note that the device 300b may be an antenna for communicating with the outside. In the first embodiment, the device 300b is provided outside the optical transceiver module 100. However, the position of the device 300b does not limit the embodiment, and the device 300b may be configured to be provided in the optical transceiver module 100. Note that the device 300b corresponds to the second device. Also, in the example shown in FIG. 1, an example in which nothing is connected to the other end of the second signal line 120 is shown, but this configuration does not limit the configuration of the embodiment. For example, the signal line at the other end of the second signal line 120 may be extended, and another device may be connected to the extended signal line. Alternatively, an element such as a termination resistor for impedance matching may be provided at the other end of the second signal line 120 to suppress unnecessary reflection and resonance of the signal.

[0017] The second signal line 120 is a signal line for transmitting a signal of a second frequency that is a high frequency with respect to the first frequency. Also, in the first embodiment, the second signal line 120 is a copper foil wiring pattern formed of a copper wire, similar to the first signal line 110, and it is desirable that the thickness be the same as that of the first signal line 110 in order to match the impedance.

[0018] FIG. 2A is a diagram showing a schematic configuration when the optical transceiver module 100 in the first embodiment operates as an optical transmission module 100a that transmits an optical signal. Also, FIG. 2B is a diagram showing a schematic configuration when the optical transceiver module 100 in the first embodiment operates as an optical reception module 100b that receives an optical signal. Hereinafter, when it is not necessary to separately describe the optical transmission module 100a and the optical reception module 100b, they are simply referred to as "optical transceiver module 100".

[0019] As shown in FIG. 2A, a laser 200a is used as a photoelectric element 200 that transmits an optical signal in the optical transmission module 100a. The laser 200a is composed of, for example, a VCSEL (Vertical Cavity Surface Emitting Laser).

[0020] Also, as shown in FIG. 2A, in the optical transmission module 100a, a low-frequency signal sent from the device 300a is transmitted by the first signal line 110, converted from an electrical signal to an optical signal by the laser 200a, and transmitted to the outside as an optical signal. In the first embodiment, the value of the first frequency of the low-frequency signal transmitted from the device 300a is 4.5 GHz.

[0021] Also, as shown in FIG. 2A, in the optical transmission module 100a, a high-frequency signal sent from the device 300b is transmitted by the second signal line 120. Further, the signal transmitted by the second signal line 120 jumps to the first signal line 110 due to crosstalk in the first coupling transmission path 101 shown in FIG. 2A, and an optical signal is transmitted from the first signal line 110 via the laser 200a. Details of the signal jumping function due to the first coupling transmission path 101 and crosstalk will be described later. In the first embodiment, the value of the second frequency of the high-frequency signal transmitted from the device 300b is 28 GHz.

[0022] As shown in FIG. 2B, a PD200b (Photo Diode) is used as a photoelectric element 200 that receives an optical signal in the optical reception module 100b. As shown in FIG. 2B, in the optical reception module 100b, when the signal received by the PD200b and converted into an electrical signal is a low frequency, it is sent to the device 300a via the first signal line 110. In the first embodiment, the value of the first frequency of the low-frequency signal transmitted to the device 300a is 4.5 GHz.

[0023] Also, as shown in FIG. 2B, when the signal received by PD200b and converted into an electrical signal is a high-frequency signal in the optical transmission module 100a, the signal transfers to the second signal line 120 due to crosstalk in the first coupling transmission line 101 shown in FIG. 2B. The high-frequency signal that has transferred to the second signal line 120 is sent to the device 300b via the second signal line 120. Details of the signal transfer function due to this crosstalk will be described later. Also, in the first embodiment, the value of the second frequency of the high-frequency signal transmitted to the device 300b is 28 GHz.

[0024] (Configuration of the First Coupling Transmission Line 101) In the first embodiment, the optical transceiver module 100 includes the first coupling transmission line 101. As shown in FIGS. 2A and 2B, the first coupling transmission line 101 is a coupling transmission line formed by a part of the first signal line 110 and a part of the second signal line 120. Also, in the first coupling transmission line 101, a part of the first signal line 110 and a part of the second signal line 120 are arranged at a predetermined interval. Also, in the first coupling transmission line 101, a part of the first signal line 110 and a part of the second signal line 120 are arranged in parallel at a predetermined distance in the longitudinal direction of a part of the first signal line 110. Note that the predetermined interval and the predetermined distance in the first coupling transmission line 101 will be described later. In FIGS. 2A and 2B, the predetermined distance is indicated by the distance L1.

[0025] (Function of the Optical Transceiver Module 100) Next, with reference to FIGS. 3A, 3B, 4A to 4C, the signal transfer due to crosstalk in the first coupling transmission line 101 of the first embodiment will be described.

[0026] FIG. 3A is a diagram showing the transmission characteristics of a signal with respect to frequency. The horizontal axis of FIG. 3A indicates the frequency [GHz], and the vertical axis indicates the amplitude [dB] of the signal. In the example shown in FIG. 3A, the signal has good transmissibility at frequencies with low signal attenuation, and poor transmissibility at frequencies with high signal attenuation. In the first coupling transmission line 101 in the first embodiment, crosstalk occurs at frequencies with low signal attenuation in the transmission characteristics. Specifically, crosstalk occurs at the location F2 where the frequency shown in FIG. 3A is from about 25 GHz to 30 GHz. The optical transceiver module 100 in the first embodiment utilizes this crosstalk effect to achieve the transfer of high-frequency signals.

[0027] FIG. 3B shows the parameters of the first signal line 110 and the second signal line 120 of the first coupling transmission line 101 in the first embodiment, as well as the specific values of a predetermined interval and a predetermined distance.

[0028] Also, FIGS. 4A to 4C are schematic diagrams of an enlarged view of the first coupling transmission line 101 shown in FIG. 2A or FIG. 2B, and are diagrams showing the state of the signal in the case of a predetermined frequency in FIG. 3A. In the examples shown in FIGS. 4A to 4C, the predetermined interval of the first coupling transmission line 101 is indicated by the interval S. Also, in the examples shown in FIGS. 4A to 4C, the predetermined distance of the first coupling transmission line 101 is indicated by the distance L1.

[0029] As shown in FIG. 3B, the length of the distance L1 in the first coupling transmission line 101 is, for example, 25 mm. Also, the interval S in the first coupling transmission line 101 is 0.1 mm. Also, the transmission line widths W of both the first signal line 110 and the second signal line 120 in the first coupling transmission line 101 are both 0.2 mm. Note that the distance L (transmission line length for the main line) in FIG. 3B corresponds to the length of the portion of the first signal line 110 other than in the first coupling transmission line 101, and may be any length equal to or greater than the distance L1.

[0030] In the first embodiment, when a signal of the second frequency is transmitted on either the first signal line 110 or the second signal line 120 of the first combined transmission line 101, the signal of the second frequency migrates due to crosstalk in the first combined transmission line 101. Specifically, when a signal of the second frequency is transmitted on either the first signal line 110 or the second signal line 120 in the first combined transmission line 101, the signal of the second frequency migrates to the other first signal line 110 or second signal line 120.

[0031] In FIG. 3A, when the frequency corresponds to the value of F1, the transmission characteristic is approximately -37 dB. In this case, as shown in FIG. 4A, for example, when a low-frequency signal is transmitted on the second signal line 120, it does not migrate to the first signal line 110 and is transmitted on the second signal line 120.

[0032] On the other hand, in FIG. 3A, when the frequency corresponds to the value of F2, the transmission characteristic is approximately 0 dB. In this case, as shown in FIG. 4B, for example, when a signal of 28 GHz, which is a high frequency, is transmitted on the second signal line 120, the signal migrates to the first signal line 110 due to the effect of crosstalk and is transmitted on the first signal line 110.

[0033] Furthermore, in FIG. 3A, when the frequency corresponds to the value of F3, the transmission characteristic is approximately -35 dB. In this case, as shown in FIG. 4C, for example, when a signal of 60 GHz, which is a high frequency, is transmitted on the second signal line 120, although the signal migrates to the first signal line 110, it further returns to the second signal line 120 and is transmitted on the second signal line 120.

[0034] In the first embodiment, by applying the effect of crosstalk-induced transfer described above, it becomes possible to select and transmit / receive signals of a predetermined frequency. For example, in the example of transmission shown in FIG. 2A, a 4.5 GHz signal, which is a low frequency transmitted from device 300a, is directly transmitted from laser 200a via the first signal line 110. Also, a signal with a frequency of 28 GHz, which is a high frequency transmitted from device 300b, transfers to the first signal line 110 in the first coupled transmission line 101 due to the effect of the above-described crosstalk, and is transmitted from laser 200a via the first signal line 110. That is, by using the optical transmission module 100a shown in FIG. 2A, it becomes possible to transmit optical signals corresponding to a plurality of frequencies without separately providing a selection circuit (coupling circuit).

[0035] Similarly, in the example of reception shown in FIG. 2B, when the signal received by PD200b and converted into an electrical signal is a 4.5 GHz signal, which is a low frequency, it does not transfer to the second signal line 120 due to the characteristics shown in FIG. 3A above. Therefore, when the signal received by PD200b and converted into an electrical signal is a 4.5 GHz signal, which is a low frequency, the signal is directly sent to device 300a via the first signal line 110.

[0036] Also, in the example of reception shown in FIG. 2B, when the signal received by PD200b and converted into an electrical signal is a 28 GHz signal, which is a high frequency, it transfers to the second signal line 120 due to the characteristics shown in FIG. 3A above. Therefore, when the signal received by PD200b and converted into an electrical signal is a 28 GHz signal, which is a high frequency, the signal is sent to device 300b via the first signal line 110 and the second signal line 120. That is, by using the optical reception module 100b shown in FIG. 2B, it becomes possible to receive optical signals corresponding to a plurality of frequencies without separately providing a distribution circuit.

[0037] As described above, the optical transceiver module 100 in the first embodiment is an optical transceiver module 100 that transmits and receives optical signals by the optoelectronic device 200, and includes a first signal line 110 that is connected to the optoelectronic device 200 and transmits a signal of a first frequency. Further, the optical transceiver module 100 includes a second signal line 120 that transmits a signal of a second frequency, which is higher than the first frequency. Furthermore, the optical transceiver module 100 includes a first coupling transmission path 101 in which a part of the first signal line 110 and a part of the second signal line 120 are separated by a predetermined interval and are arranged in parallel in the longitudinal direction of a part of the first signal line 110 at a predetermined distance. When a signal of the second frequency is transmitted to either the first signal line 110 or the second signal line 120 of the first coupling transmission path 101, the signal of the second frequency transfers to the other first signal line 110 or second signal line 120 due to crosstalk.

[0038] Thereby, the optical transceiver module 100 can receive optical signals corresponding to a plurality of frequencies with a simple configuration without separately providing a band-pass filter or the like for combining or separating signals.

[0039] Further, the optoelectronic device 200 may be a light-emitting device that converts an electrical signal into an optical signal and transmits the optical signal to the outside. The light-emitting device corresponds to the laser 200a. Thereby, the optical transceiver module 100 can transmit optical signals corresponding to a plurality of frequencies with a simple configuration without separately providing a signal selection circuit (combining circuit).

[0040] Furthermore, the optoelectronic device 200 may be a light-receiving device that receives an optical signal and converts the received optical signal into an electrical signal. The light-receiving device corresponds to the PD 200b. Thereby, the optical transceiver module 100 can receive optical signals corresponding to a plurality of frequencies with a simple configuration without separately providing a signal distribution circuit.

[0041] In the first embodiment, an example where the distance L1 in the first coupling transmission line 101 is 25 mm as shown in FIG. 3B was shown, but this value does not limit the configuration of the embodiment. For example, when the value of the first frequency is 4.5 GHz and the value of the second frequency is 28 GHz, by setting the distance L1 to 20 mm to 40 mm, the effect of the transfer of the high-frequency signal in the first coupling transmission line 101 can be realized.

[0042] (Second Embodiment) As described above, one specific embodiment has been described, but the above-described embodiments are examples and do not limit the embodiments. For example, in the above-described embodiment, a form is exemplified in which the first signal line 110 provided between the optoelectronic element 200 and the device 300a and the second signal line 120 that is partially parallel and close to the first signal line 110 are provided. Here, the optical transmission / reception module 100 according to the second embodiment including the amplifier 400 in the first signal line 110 and / or the second signal line 120 will be described with respect to the configuration different from that of the first embodiment.

[0043] FIGS. 5A and 5B show an example in which the optical transmission module 100a includes the amplifier 400 in the first signal line 110 and / or the second signal line 120.

[0044] As shown in Fig. 5A, the optical transceiver module 100 in the second embodiment includes an amplifier 400 between a first coupling transmission path 101, which is a coupling transmission path between a first signal line 110 and a second signal line 120, and a laser 200a. In this way, by providing the amplifier 400 between the first coupling transmission path 101 and the laser 200a, a plurality of frequencies can be amplified by a single amplifier 400. Therefore, an optical transmission module 100a equipped with the amplifier 400 can be realized with a simpler configuration. Further, when a signal with a wide frequency bandwidth such as an OFDM signal is applied to the optical transceiver module 100, the characteristics are affected by the slope of the gain in the frequency domain of the signal used. Thus, as shown in Fig. 5C, the slope of the gain with respect to the frequency used for the amplifier 400 may be such that it cancels out the slope of the frequency gain caused by components of circuits and optoelectronic devices other than the amplifier 400 provided in the optical transceiver module 100 (circuits etc. in the figure). That is, the amplifier 400 may have a gain characteristic with respect to frequency that is, for example, opposite to the slope of the gain with respect to the frequency generated by the optoelectronic device 200. Also, the target for which the gain with respect to frequency is canceled due to the characteristics of the amplifier 400 is not limited to the optoelectronic device 200 and may be a circuit other than the amplifier 400 provided in the optical transceiver module 100. With the amplifier 400 having this characteristic, the slope of the gain caused by the circuit etc. is canceled, and better characteristics can be obtained in the optical transceiver module 100.

[0045] Also, as shown in FIG. 5B, the amplifier 400 may be provided on the first signal line 110 and the second signal line 120 between the devices 300a and 300b and the first coupling transmission line 101, respectively. By adopting such a configuration, it becomes possible to use the amplifier 400 corresponding to each frequency, expanding the options of the amplifier 400 to be used and enabling the realization of the optical transmission module 100a with a flexible configuration. Further, when a signal with a wide frequency bandwidth such as an OFDM signal is applied to the optical transceiver module 100, the characteristics are affected by the slope of the gain in the frequency domain of the signal to be used. Therefore, as shown in FIG. 5C, the slope of the gain with respect to the frequency used for the amplifier 400 may be such that it cancels out the slope of the frequency gain due to the components of the circuits and optoelectronic elements other than the amplifier 400 provided in the optical transceiver module 100 (circuits, etc. in the figure). That is, the amplifier 400 may have a gain characteristic with respect to frequency that is, for example, opposite to the slope of the gain with respect to the frequency generated by the optoelectronic element 200. Also, the target for which the gain with respect to frequency is canceled by the characteristics of the amplifier 400 is not limited to the optoelectronic element 200 and may be a circuit other than the amplifier 400 provided in the optical transceiver module 100. With the amplifier 400 having such characteristics, the slope of the gain due to the circuits and the like is canceled, and better characteristics can be obtained in the optical transceiver module 100.

[0046] Also, FIGS. 6A and 6B show an example in which the amplifier 400 is used in the optical reception module 100b. In FIG. 6A, the amplifier 400 is used between the first coupling transmission path 101, which is the coupling transmission path between the first signal line 110 and the second signal line 120, and the PD 200b. Thereby, since a plurality of frequencies can be amplified by one amplifier 400, an optical reception module 100b including the amplifier 400 can be realized with a simpler configuration. Further, when a signal having a wide frequency bandwidth such as an OFDM signal is applied to the optical transceiver module 100, the characteristics are affected by the slope of the gain in the frequency domain of the signal to be used. Therefore, as shown in FIG. 5C, the slope of the gain with respect to the frequency used for the amplifier 400 may be such that it cancels out the slope of the frequency gain due to the components of the circuits and optoelectronic elements other than the amplifier 400 provided in the optical transceiver module 100 (circuits, etc. in the figure). That is, the amplifier 400 may have a gain characteristic with respect to frequency that is, for example, opposite to the slope of the gain with respect to the frequency generated by the optoelectronic element 200. Also, the object whose gain with respect to frequency is canceled by the characteristics of the amplifier 400 is not limited to the optoelectronic element 200, and may be a circuit other than the amplifier 400 provided in the optical transceiver module 100. With the amplifier 400 having this characteristic, the slope of the gain due to the circuit or the like is canceled, and better characteristics can be obtained in the optical transceiver module 100.

[0047] Similarly, as shown in FIG. 6B, the amplifier 400 may be arranged on the first signal line 110 and the second signal line 120 between the apparatuses 300a and 300b and the first coupling transmission line 101, respectively. With such a configuration, it becomes possible to use the amplifier 400 corresponding to each frequency, expanding the options of the amplifier 400 to be used and enabling the realization of the optical reception module 100b with a flexible configuration. Further, when a signal with a wide frequency bandwidth such as an OFDM signal is applied to the optical transceiver module 100, the characteristics are affected by the slope of the gain in the frequency domain of the signal to be used. Therefore, as shown in FIG. 5C, the slope of the gain with respect to the frequency used for the amplifier 400 may be configured to cancel the slope of the frequency gain by components such as circuits and optoelectronic elements (circuits, etc. in the figure) other than the amplifier 400 provided in the optical transceiver module 100. That is, the amplifier 400 may have a gain characteristic with respect to frequency that is, for example, opposite to the slope of the gain with respect to the frequency generated by the optoelectronic element 200. Further, the target for which the gain with respect to frequency is canceled by the characteristics of the amplifier 400 is not limited to the optoelectronic element 200 and may be a circuit other than the amplifier 400 provided in the optical transceiver module 100. By using the amplifier 400 having this characteristic, the slope of the gain by the circuit or the like is canceled, and better characteristics can be obtained in the optical transceiver module 100.

[0048] Also, in the second embodiment, a narrow-band amplifier 400 may be used for the amplifier 400. For example, in the configuration of FIG. 5B or FIG. 6B, an optical transmission module 100a provided with narrow-band amplifiers 400 corresponding to respective frequencies may be realized. By using such a narrow-band amplifier 400, it becomes possible to reduce noise related to frequencies not used in the optical transceiver module 100 and to reduce unnecessary radiation due to noise or the like.

[0049] Also, in the second embodiment, when the amplifier 400 is provided on the first signal line 110, it may be configured to include a capacitor 500 between the amplifier 400 and the power supply 111. By providing the capacitor 500 between the amplifier 400 and the power supply 111 in this way, it becomes possible to extract the AC component of the signal, and it becomes possible to realize a more stable optical transceiver module 100.

[0050] As described above, the optical transceiver module 100 according to the second embodiment may include an amplifier 400 between the optoelectronic element 200 of the first signal line 110 and the first coupling transmission line 101. Thereby, since the optical transceiver module 100 can amplify a plurality of frequencies with one amplifier 400, it is possible to realize the optical transmission module 100a provided with the amplifier 400 with a simpler configuration.

[0051] Also, the optical transceiver module 100 may include an amplifier 400 between the first coupling transmission line 101 of the first signal line 110 and an external first device, and between the first coupling transmission line 101 of the second signal line 120 and an external second device. With such a configuration, the optical transceiver module 100 can use an amplifier 400 corresponding to each frequency, expanding the options of the amplifier 400 to be used, and it becomes possible to realize the optical transceiver module 100 with a flexible configuration.

[0052] (Other Embodiments) Although the embodiments have been described in detail with reference to the drawings, the present embodiment is not limited by the contents described in the above embodiments. In addition, the constituent elements described above include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the configurations described above can be combined as appropriate. Also, various omissions, substitutions, or changes in the configuration can be made without departing from the gist of the embodiment.

[0053] In the above-described embodiment, examples of the two frequencies corresponding to the optical transceiver module 100 are the low-frequency 4.5 GHz and the high-frequency 28 GHz. The number and values of the corresponding frequencies in the embodiment are not limited to this form. Hereinafter, Modification Example 1 and Modification Example 2 that can correspond to the number and values of the corresponding frequencies in the embodiment will be described.

[0054] (Modification Example 1) FIGS. 7A and 7B include a third signal line 130 through which a signal of a third frequency, which is higher than the second frequency of the signal transmitted through the second signal line 120, is transmitted, in addition to the first signal line 110 and the second signal line 120. The third signal line 130 is formed of a copper foil wiring pattern, similar to the first signal line 110 and the second signal line 120, and it is assumed that the transmission path width W is the same as that of the first signal line 110 and the second signal line 120.

[0055] Also, the optical transceiver module 100 in Modification Example 1 includes a second coupling transmission path 102 formed by a part of the first signal line 110 and a part of the third signal line 130. In the second coupling transmission path 102, a part of the first signal line 110 and a part of the third signal line 130 are arranged at a predetermined interval. Also, in the second coupling transmission path 102, a part of the first signal line 110 and a part of the third signal line 130 are arranged in parallel at a predetermined distance in the longitudinal direction of the part of the first signal line 110. When a signal of the third frequency is transmitted to either the first signal line 110 or the third signal line 130 in the second coupling transmission path 102, the signal of the third frequency transfers to the other first signal line 110 or third signal line 130 due to crosstalk in the second coupling transmission path 102.

[0056] In the second embodiment, let the longitudinal length in the second coupling transmission path 102 be the distance L2.

[0057] FIG. 7A shows an example in which the optical transceiver module 100 is configured as an optical transmission module 100a that transmits an optical signal. Further, FIG. 7B shows an example in which the optical transceiver module 100 is configured as an optical reception module 100b that receives an optical signal. Also, in FIGS. 7A and 7B, an example is shown in which the frequency of the signal transmitted through the third signal line 130 is 60 GHz.

[0058] FIG. 8A is a diagram showing the characteristics of the frequency and transmission characteristics in the first coupling transmission line 101 and the second coupling transmission line 102 in Modification 1. Further, FIG. 8B shows each parameter of the configuration used to show the characteristics of FIG. 8A. As shown in FIG. 8B, the distance L2 of the second coupling transmission line 102 is 14 mm, which is shorter than 25 mm of the distance L1 of the first coupling transmission line 101. Also, the interval S and the transmission line width W between the first coupling transmission line 101 and the second coupling transmission line 102 are the same as the values described in FIG. 3B above. Note that the distance L (transmission line length for the main line) in FIG. 8B corresponds to the length of the portion of the first signal line 110 other than the first coupling transmission line 101 and the second coupling transmission line 102, and the length may be "distance L1 + distance L2" or more.

[0059] When the optical transceiver module 100 is configured with the parameters shown in FIG. 8B, in the first coupling transmission line 101, as in the characteristics shown in FIG. 3A above, as shown by the dotted line in FIG. 8A, the transmission characteristic becomes 0 dB in the vicinity of a frequency of about 30 GHz. On the other hand, when the optical transceiver module 100 is configured with the parameters shown in FIG. 8B, in the second coupling transmission line 102, as per the characteristics of the second coupling transmission line 102 shown by the dashed-dotted line in FIG. 8A, the transmission characteristic becomes 0 dB in the vicinity of a frequency of about 60 GHz. That is, in the second coupling transmission line 102, crosstalk-induced transfer occurs in the signal with a frequency of about 60 GHz.

[0060] That is, in the example shown in FIG. 7A, the signal with a frequency of 60 GHz transmitted from the device 300c transfers to the first signal line 110 in the second coupling transmission line 102. Here, the signal with a frequency of 60 GHz that has transferred to the first signal line 110 does not experience signal transfer in the first coupling transmission line 101, as per the characteristics of the first coupling transmission line 101 shown by the dotted line in FIG. 8A. Therefore, the signal with a frequency of 60 GHz that has transferred to the first signal line 110 is transmitted as an optical signal via the laser 200a.

[0061] Similarly, in the example shown in FIG. 7B, when the signal converted from the optical signal to an electrical signal by the PD200b is 60 GHz, the signal transmitted on the first signal line 110 does not experience signal transfer to the second signal line 120, as per the characteristics shown by the dotted line in FIG. 8A. On the other hand, when the signal transmitted on the first signal line 110 is 60 GHz, signal transfer to the third signal line 130 occurs, as per the characteristics of the second coupling transmission line 102 shown by the dashed-dotted line in FIG. 8A. As a result, the signal with a frequency of 60 GHz received by the PD200b and converted to an electrical signal is transmitted to the device 300c.

[0062] As described above, in Modification 1, the optical transceiver module 100 includes a third signal line 130 that transmits a signal having a frequency higher than the frequency of the signal transmitted through the second signal line 120. The optical transceiver module 100 also includes a second coupled transmission path 102 formed by a part of the first signal line 110 and a part of the third signal line 130. In the second coupled transmission path 102, a part of the first signal line 110 and a part of the third signal line 130 are arranged at a predetermined interval. Also, in the second coupled transmission path 102, a part of the first signal line 110 and a part of the third signal line 130 are arranged in parallel in the longitudinal direction of the part of the first signal line 110 at a predetermined distance. When a signal of a third frequency is transmitted to either the first signal line 110 or the third signal line 130 of the second coupled transmission path 102, the signal of the third frequency transfers to the other first signal line 110 or third signal line 130 due to crosstalk in the second coupled transmission path 102. Note that the distance L2 of the second coupled transmission path 102 is shorter than the distance L1 of the first coupled transmission path 101. Also, Modification 1 is not limited to a configuration including the first coupled transmission path 101 and the second coupled transmission path 102 shown in FIGS. 7A and 7B, and may further be configured to include fourth and subsequent coupled transmission paths.

[0063] Thus, in Modification 1, by providing the second coupled transmission path 102, it is possible to increase the frequencies that can be supported by the device connected to the optical transceiver module 100. That is, it becomes possible to realize an optical transceiver module 100 that can flexibly support the frequencies of the devices connected to the optical transceiver module 100.

[0064] In addition, in Modification 1, regarding the distance L1 in the second coupling transmission path 102, as shown in FIG. 8B, it is 25 mm, and regarding the distance L2, an example where it is 14 mm was shown. However, this value does not limit the configuration of the embodiment. For example, when the value of the first frequency is 4.5 GHz, the value of the second frequency is 28 GHz, and the value of the third frequency is 60 GHz, by setting the distance L1 to 20 mm to 40 mm, the effect of signal transfer of the second frequency in the first coupling transmission path 101 can be realized. Further, when the value of the first frequency is 4.5 GHz, the value of the second frequency is 28 GHz, and the value of the third frequency is 60 GHz, by setting the distance L2 to 10 mm to 20 mm, the effect of signal transfer of the third frequency in the second coupling transmission path 102 can be realized.

[0065] (Modification 2) FIGS. 9A and 9B show the configuration of an optical transceiver module 100 including an IF processing unit 600 (Intermediate Frequency) in the second signal line 120 as Modification 2. The IF processing unit 600 performs conversion processing of the frequency of the signal handled by the device 300b to an intermediate frequency that can be processed by the optical transceiver module 100. Note that the IF processing unit 600 corresponds to an intermediate frequency processing unit.

[0066] For example, in the example shown in FIG. 9A, when the device 300b handles a 60 GHz high-frequency signal, the IF processing unit 600 converts the frequency of the 60 GHz signal to 30 GHz that can be transferred to the first signal line 110 in the first coupling transmission path 101. That is, by using the IF processing unit 600, it becomes possible to convert the high-frequency signal line processed by the device 300b into a signal having a frequency that can be transmitted from the laser 200a via the first coupling transmission path 101.

[0067] Also, in the example shown in FIG. 9B, when the apparatus 300b handles a high-frequency signal of 60 GHz, the IF processing unit 600 converts a 30 GHz signal transferred from the first signal line 110 to the second signal line 120 through the first coupling transmission line 101 into a 60 GHz signal. That is, by using the IF processing unit 600, it becomes possible to convert a signal transmitted from the PD200b, transferred to the second signal line 120 via the first coupling transmission line 101, into a high-frequency signal that can be handled by the apparatus 300b.

[0068] As described above, in the second modification, the optical transceiver module 100 includes the IF processing unit 600 in the second signal line 120. As a result, it becomes possible to handle even high-frequency signals other than the frequencies that can be transferred by the first coupling transmission line 101. That is, the optical transceiver module 100 in the second modification can handle various frequencies, and becomes a more useful technology in the field of wireless communication where higher frequencies are advancing.

[0069] The characteristics of the optical transceiver module 100 will be described below.

[0070] The optical transceiver module 100 according to the first aspect is an optical transceiver module 100 that transmits and receives an optical signal by the optoelectronic element 200. The optical transceiver module 100 includes a first signal line 110 connected to the optoelectronic element 200 and transmitting a signal of a first frequency, and a second signal line 120 transmitting a signal of a second frequency that is higher than the first frequency. Further, the optical transceiver module 100 includes a first coupling transmission line 101 formed by a part of the first signal line 110 and a part of the second signal line 120. In the first coupling transmission line 101, a part of the first signal line 110 and a part of the second signal line 120 are separated by a predetermined interval. Also, in the first coupling transmission line 101, a part of the first signal line 110 and a part of the second signal line 120 are arranged in parallel at a predetermined distance in the longitudinal direction of the part of the first signal line 110. When a signal of the second frequency is transmitted to either the first signal line 110 or the second signal line 120 of the first coupling transmission line 101, the signal of the second frequency transfers to the other first signal line 110 or second signal line 120 due to crosstalk in the first coupling transmission line 101.

[0071] According to the above configuration, the optical transceiver module 100 can receive optical signals corresponding to a plurality of frequencies with a simple configuration without separately providing a band-pass filter or the like for combining or separating signals.

[0072] The optoelectronic device 200 of the optical transceiver module 100 according to the second aspect may be a light-emitting device that converts an electrical signal into an optical signal and transmits the optical signal to the outside.

[0073] According to the above configuration, the optical transceiver module 100 can transmit optical signals corresponding to a plurality of frequencies with a simple configuration without separately providing a signal selection circuit (combining circuit).

[0074] The optoelectronic device 200 of the optical transceiver module 100 according to the third aspect may be a light-receiving device that receives an optical signal and converts the received optical signal into an electrical signal.

[0075] According to the above configuration, the optical transceiver module 100 can receive optical signals corresponding to a plurality of frequencies with a simple configuration without separately providing a signal distribution circuit.

[0076] The optical transceiver module 100 according to the fourth aspect may further include an amplifier 400 between the optoelectronic device 200 of the first signal line 110 and the first coupling transmission line 101.

[0077] According to the above configuration, since the optical transceiver module 100 can amplify a plurality of frequencies with one amplifier 400, the optical transceiver module 100a provided with the amplifier 400 can be realized with a simpler configuration.

[0078] The optical transceiver module 100 according to the fifth aspect may include an amplifier 400 between the first combined transmission path 101 of the first signal line 110 and an external first device connected to the first signal line 110. Further, the optical transceiver module 100 may include an amplifier 400 between the first combined transmission path 101 of the second signal line 120 and an external second device connected to the second signal line 120, respectively.

[0079] According to the above configuration, the optical transceiver module 100 can use the amplifier 400 corresponding to each frequency, expanding the options of the amplifier 400 to be used and enabling the realization of the optical transceiver module 100 with a flexible configuration.

[0080] The amplifier 400 of the optical transceiver module 100 according to the sixth aspect may have a gain characteristic with respect to frequency that is opposite to the slope of the gain with respect to the frequency generated in the optoelectronic device 200.

[0081] According to the above configuration, the amplifier 400 cancels out the slope of the gain by a circuit or the like, so that better characteristics can be obtained in the optical transceiver module 100.

[0082] The optical transceiver module 100 according to the seventh aspect may include a third signal line 130 that transmits a signal of a third frequency, which is higher than the second frequency. Further, the optical transceiver module 100 may include a second combined transmission path 102 formed by a part of the first signal line 110 and a part of the third signal line 130. In the second combined transmission path 102, a part of the first signal line 110 and a part of the third signal line 130 may be separated at a predetermined interval. Also, in the second combined transmission path 102, a part of the first signal line 110 and a part of the third signal line 130 may be arranged in parallel at a predetermined distance in the longitudinal direction of the part of the first signal line 110. When a signal of the third frequency is transmitted to either the first signal line 110 or the third signal line 130 of the second combined transmission path 102, the signal of the third frequency may transfer to the other first signal line 110 or third signal line 130 due to crosstalk in the second combined transmission path 102.

[0083] According to the above configuration, the optical transceiver module 100 can increase the frequencies that can be handled by the devices connected to the optical transceiver module 100. That is, it becomes possible to realize the optical transceiver module 100 that can flexibly respond to the frequencies of the devices connected to the optical transceiver module 100.

[0084] The optical transceiver module 100 according to the eighth aspect may further include an intermediate frequency processing unit in the second signal line 120.

[0085] According to the above configuration, the optical transceiver module 100 can also handle high-frequency signals other than the frequencies that can be transferred by the first coupling transmission line 101. That is, the optical transceiver module 100 in the second modification can handle various frequencies, and it becomes a more useful technology in the field of wireless communication where higher frequencies are advancing.

Explanation of Reference Numerals

[0086] 100 Optical transceiver module 101 First coupling transmission line 102 Second coupling transmission line 110 First signal line 111 Power supply 112 Inductor 120 Second signal line 200 Photoelectric element 200a Laser 200b PD, Photodiode 300a, 300b, 300c Devices 400 Amplifier 500 Capacitor 600 IF processing unit

Claims

1. An optical transceiver module that transmits and receives optical signals by an optoelectronic device, a first signal line connected to the optoelectronic device and transmitting a signal of a first frequency, a second signal line transmitting a signal of a second frequency that is higher than the first frequency, a coupled transmission path formed by a part of the first signal line and a part of the second signal line, wherein the part of the first signal line and the part of the second signal line are separated by a predetermined interval, and the part of the first signal line and the part of the second signal line are arranged in parallel at a predetermined distance in the longitudinal direction of the part of the first signal line, and a first coupled transmission path, when the signal of the second frequency is transmitted to either the first signal line of the first coupled transmission path or the second signal line of the first coupled transmission path, the signal of the second frequency transfers to the other first signal line or the second signal line due to crosstalk in the first coupled transmission path, an optical transceiver module.

2. The optoelectronic device is a light-emitting device that converts an electrical signal into the optical signal and transmits the optical signal to the outside, The optical transceiver module according to Claim 1.

3. The optoelectronic device is a light-receiving device that receives the optical signal and converts the received optical signal into an electrical signal, The optical transceiver module according to Claim 1.

4. further comprising an amplifier between the optoelectronic device of the first signal line and the first coupled transmission path, The optical transceiver module according to any one of Claims 1 to 3.

5. amplifiers are respectively provided between the first coupled transmission path of the first signal line and an external first device connected to the first signal line, and between the first coupled transmission path of the second signal line and an external second device connected to the second signal line, The optical transceiver module according to any one of Claims 1 to 3.

6. The amplifier has a gain characteristic with respect to frequency that is opposite to the slope of the gain with respect to the frequency generated by the optoelectronic device, the optical transceiver module according to Claim 4 or 5.

7. a third signal line transmitting a signal of a third frequency that is higher than the second frequency, A coupled transmission path formed by a part of the first signal line and a part of the third signal line, wherein the part of the first signal line and the part of the third signal line are separated by a predetermined interval, and the part of the first signal line and the part of the third signal line are arranged in parallel in the longitudinal direction of the part of the first signal line at a predetermined distance, and a second coupled transmission path; When a signal of the third frequency is transmitted to either the first signal line of the second coupled transmission path or the third signal line of the second coupled transmission path, the signal of the third frequency is transferred to the other first signal line or the third signal line due to crosstalk in the second coupled transmission path. The optical transceiver module according to any one of claims 1 to 6.

8. The second signal line further includes an intermediate frequency processing unit. The optical transceiver module according to any one of claims 1 to 7.

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