JP2013005316A - Information transmission/reception device, information transmission device and information reception device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an information transmission/reception device, an information transmission device and an information reception device, available for both radio communication and wired communication and capable of high speed communication.SOLUTION: An information transmission/reception device includes: an optical frequency comb 201 for generating an optical comb signal; an optical filter 202 for extracting a plurality of optical carriers from the optical comb signal; an optical modulator 203 for superposing digital transmission signals to be transmitted on the optical carrier; a first optical coupler 204 for multiplexing the optical carriers having the digital transmission signals superposed thereon with the optical carrier extracted by the optical filter 202, to generate optical transmission signals to be transmitted through radio communication or optical communication; a baseband conversion circuit 206 for beating down into a baseband signal an RF reception signal received on a radio interface or an RF reception signal converted from an optical radio signal received on a wired interface; and a digital signal processor 207 for demodulating the RF reception signal into a digital signal.

Description

  The present invention relates to an information transmitting / receiving device, an information transmitting device, and an information receiving device used in a broadband access system.

  In recent years, the speed of optical access systems has increased significantly, and in the last five years, the speed and bandwidth have increased by a factor of 100. With the introduction of the GE-PON (Gigabit Ethernet (registered trademark) -Passive Optical Network) system, Giga-class Broadband service is provided.

  Standardization of 10GE-PON was completed in 2009, and next-generation PON for higher speed and wider bandwidth than 10G is now being discussed by standardization organizations such as IEEE and FSAN.

  On the other hand, with regard to speeding up of wireless communication, a wireless LAN exceeding 100 Mbps is realized by the IEEE802.11n standard. In addition, the third generation mobile phone is provided with a High Speed Downlink Packet Access (HSDPA) service with a downlink of 7.2 Mbps, and an LTE (Long Term Evolution) data communication service exceeding 10 Mbps at the end of 2010.

  In addition, standardization and technology development for 4G are being promoted, and there are increasing expectations for the realization of next-generation high-speed services that exceed the giga class.

  As described above, transmission and reception technologies related to wireless and wired (optical) have been developed independently for broadband, but in recent years, with the increase in wireless speed, access that combines wireless and wired (optical) has been developed. Network research and development is becoming more active.

  For example, Non-Patent Document 1 describes that two CW lights with different optical frequencies are extracted from an optical MMW signal generator (optical frequency comb) using an optical filter, and a 125 GHz band radio signal generated as a beat signal is used at 10 Gbps. A technique for data transmission is described.

  Non-Patent Document 2 describes a technique in which RoF (Radio on Fiber) technology is applied to OADM (Optical Add Drop Multiplexer). In this technique, a WDM (Wavelength Division Multiplexing) light source is directly modulated with RF frequencies in different millimeter wave bands, FM modulation is performed on CW (continuous wave) light, and a transmission signal is superimposed on each CW light by external modulation. After that, these are combined by a WDM filter, FM-IM converted by a Mach-Zehnder filter, and transmitted to a node set for each wavelength using an OADM ring network. After receiving light by the light receiver, a desired beat frequency is extracted from each beat signal of the RF frequency component subjected to IM conversion by an electric filter and transmitted as a radio signal.

A. Hirata, et.al, “120-GHz-Band Millimeter-Wave Photonic Wireless Link for 10-Gb / s Data Transmission”, IEEE Trans. Microwave Theory Tech., Vol.54, No.5, pp.1937- 1944 (2006) A.M.J.Koonen, et al., “Perspectives of Radio over Fiber Technologies”, OFC / NFOEC 2008, OThP3 (2008)

  In the broadband access system as described above, stress is applied to large-capacity information such as 3D high-definition video and rich content using new mobile terminals such as tablet PCs and smartphones and cloud computing technology regardless of time and place. Broadband and ubiquitous networks that exceed the giga class using wireless and wired (optical fiber) will play an important role in ensuring complete access.

  In order to construct such a network, a large number of transmission / reception devices that are wired or wireless or a combination of wired and wireless are required.

  With regard to wireless and wired (optical fiber) communication technologies, since broadband has been independently promoted and dedicated transmission / reception devices have been developed, there is a limit in reducing manufacturing costs. Therefore, there is a big problem in economically constructing a broadband ubiquitous network by using a transmission / reception device manufactured by the prior art.

  The present invention has been made in view of the above problems, and economically provides an information transmission / reception device, an information transmission device, and an information reception device that can be used for both wireless communication and wired communication and can perform high-speed communication. The purpose is to do.

  In order to solve the above problems, in the present invention, in an optical transceiver module (optical transceiver) or a wireless transceiver module (wireless transceiver), a wireless interface for performing wireless communication or a wired interface for performing wired communication. The information transmission / reception apparatus except for is shared. The information transmitter / receiver can be connected to either a wireless interface or a wired interface, and generates an optical comb signal having a plurality of optical spectra at a fixed frequency interval in the information transmitter / receiver connected to at least one of the interfaces. An optical frequency comb, an optical filter for extracting a plurality of optical carriers from an optical comb signal generated by the optical frequency comb, and an optical modulator for superimposing a digital transmission signal to be transmitted on the optical carrier extracted by the optical filter And an optical carrier on which a digital transmission signal is superimposed by the optical modulator and an optical carrier extracted by the optical filter, and is converted into an RF transmission signal and transmitted by the wireless interface Generate a transmission signal or an optical transmission signal to be transmitted in the wired interface A first optical coupler, a second optical coupler for generating an optical beat signal by combining two optical carriers extracted by the optical filter, and an optical beat signal generated by the second optical coupler A baseband conversion circuit that beats down an RF reception signal received at the wireless interface or an RF reception signal obtained by converting an optical reception signal received at the wired interface into a baseband signal, and the base And a digital signal processor that demodulates the RF reception signal beat-down by the band conversion circuit into a digital signal.

  The information transmitting / receiving apparatus of the present invention is connectable to both a wireless interface for executing wireless communication and a wired interface for executing wired communication, and transmits information connected to at least one of the interfaces. In the apparatus, an optical frequency comb that generates an optical comb signal having a plurality of optical spectra at a constant frequency interval, an optical filter that extracts a plurality of optical carriers from the optical comb signal generated by the optical frequency comb, and the optical filter An optical modulator that superimposes a digital transmission signal to be transmitted on the extracted optical carrier, an optical carrier on which the digital transmission signal is superimposed by the optical modulator, and an optical carrier that is extracted by the optical filter are combined. An optical transmission signal to be converted into an RF transmission signal in the wireless interface and transmitted, or the presence Characterized in that it comprises a first optical coupler for generating an optical transmission signal to be transmitted at the interface.

  The information transmitting / receiving apparatus of the present invention is connectable to both a wireless interface for executing wireless communication and a wired interface for executing wired communication, and receives information connected to at least one of the interfaces. In the apparatus, an optical frequency comb that generates an optical comb signal having a plurality of optical spectra at a constant frequency interval, an optical filter that extracts two optical carriers from the optical comb signal generated by the optical frequency comb, and the optical filter The second optical coupler that combines the two extracted optical carriers to generate an optical beat signal, and the optical beat signal generated by the second optical coupler, is received at the wireless interface. An RF reception signal or an RF reception signal obtained by converting an optical reception signal received at the wired interface is converted into a base signal. A baseband conversion circuit for beat down to the band signal, characterized in that it comprises a digital signal processor for demodulating the RF received signal beaten down by the baseband converter to a digital signal.

  According to the information transmitting / receiving apparatus, information transmitting apparatus, and information receiving apparatus of the present invention, it can be used for both wireless communication and wired communication, and high-speed communication can be realized economically.

(A) and (B) are general views showing the configuration of a broadband ubiquitous network using an information transmitting / receiving apparatus according to an embodiment of the present invention. (A) is a general view showing a configuration when wireless communication is performed using a conventional wireless transceiver, and (B) is an overall diagram illustrating a configuration when optical communication is performed using a conventional optical transceiver. It is a figure, (C) is a whole figure which shows the structure in the case of performing wireless communication using the information transmission / reception apparatus of this invention, (D) performs optical communication using the information transmission / reception apparatus of this invention It is a general view which shows the structure in the case. It is a block diagram which shows the structure of the optical transceiver module using the information transmitter / receiver by 1st Embodiment of this invention. It is a block diagram which shows the structure of the radio | wireless transceiver module using the information transmitter / receiver by 1st Embodiment of this invention. (A)-(E) are explanatory drawings which show the wavelength arrangement | positioning of the signal which generate | occur | produces during a process in the information transmitter / receiver by 1st Embodiment of this invention. (A), (B) is explanatory drawing which shows wavelength arrangement | positioning when a received signal and an optical beat signal are combined in the information transmitter / receiver by 1st Embodiment of this invention. (A), (B) is explanatory drawing which shows an example of a detailed structure of the baseband conversion circuit of the information transmitter / receiver by 1st Embodiment of this invention. It is explanatory drawing which shows an example of a detailed structure of the baseband conversion circuit of the information transmitter / receiver by 1st Embodiment of this invention. It is explanatory drawing which shows an example of a detailed structure of the baseband conversion circuit of the information transmitter / receiver by 1st Embodiment of this invention. It is a block diagram which shows the structure of the front end of the high-speed radio | wireless interface using the information transmission / reception apparatus by 2nd Embodiment of this invention. It is a block diagram which shows the structure of the optical transceiver module using the information transmission / reception apparatus by 3rd Embodiment of this invention. It is a block diagram which shows the structure of the radio | wireless transceiver module using the information transmitter / receiver by 3rd Embodiment of this invention. It is a block diagram which shows the structure of the front end of the high-speed wireless interface using the information transmitter / receiver by 4th Embodiment of this invention.

  As an embodiment using the information transmitting / receiving apparatus of the present invention, there are broadband ubiquitous networks 1A and 1B as shown in FIGS. FIG. 1A shows a case where digital light information is transmitted in the broadband ubiquitous network 1A, and FIG. 1B shows a case where RoF (Radio) is used in the broadband ubiquitous network 1B using a high-speed wireless interface. This shows the case where information is transmitted by the on-fiber technology.

  In these broadband ubiquitous networks 1A, 1B, signals are transmitted and received at high speed from the center station 10 to the radio base stations 20A, 20B using optical fibers, and RF (from the radio base stations 20A, 10B to the other radio transceiver modules 30 is RF ( Radio frequency signals are transmitted and received.

  In constructing the broadband ubiquitous networks 1A and 1B in this way, the optical transceiver module 110 is installed in the center station 10, and the optical transceiver module 210 and the radio transceiver module 220 are installed in the radio base station 20A. An optical transceiver module 210 and a front end 230 are installed in 20B.

  As described above, the plurality of optical transceiver modules and the plurality of wireless transceiver modules installed in the broadband ubiquitous networks 1A and 1B are conventionally constructed by dedicated devices as shown in FIGS. 2 (A) and 2 (B). These were developed and manufactured separately.

  On the other hand, in the present embodiment, as shown in FIGS. 2C and 2D, a transmission / reception apparatus (FIGS. 2C and 2D) that can be commonly used for both wireless communication and optical fiber communication. The technology of making it function as a wireless transmitter / receiver by adding a wireless interface thereto, and also functioning as an optical transmitter / receiver by adding an optical fiber interface is provided.

<< First Embodiment >>
<Configuration of Transceiver Module Using Information Transmitting / Receiving Device According to First Embodiment>
A configuration of an optical transceiver module 210A as a transmitting / receiving device using the information transmitting / receiving device according to the first embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 3, the optical transceiver module 210 </ b> A includes an information transmitting / receiving apparatus 200 </ b> A, a WDM (Wavelength Division Multiplex) filter 211 and an optical / electrical converter 212 as an optical fiber interface.

  The information transmitting / receiving apparatus 200 extracts an optical frequency comb 201 that generates an optical comb signal having a plurality of optical spectra at a constant frequency interval (f), and extracts a plurality of optical carriers from the optical comb signal generated by the optical frequency comb 201. The optical filter 202, a plurality of optical modulators 203-1 and 203-2 that superimpose a digital transmission signal to be transmitted on the optical carrier extracted by the optical filter 202, and the digital transmission signal is superimposed by the optical modulator 203. A first optical coupler 204 for generating an optical transmission signal of an optical OFDM (Orthogonal Frequency Division Multiplexing) signal by combining the optical carrier extracted with the optical carrier extracted by the optical filter 202, and extracted by the optical filter 202 A second optical coupler 205 for generating an optical beat signal by combining two optical carriers, and an optical beat generated by the second optical coupler 205 A baseband conversion circuit 206 to beat down the RF received signal to a baseband signal, and a digital signal processor 207 for demodulating the RF received signal beaten down by the baseband converter 206 into a digital signal by using the items. In the present embodiment, the number of optical modulators 203 corresponding to the number of transmission signals is installed.

  The WDM filter 211 distinguishes an optical transmission signal and an optical reception signal by frequency, transmits the optical transmission signal acquired from the first optical coupler 204 through an optical fiber, and converts the optical reception signal received from the optical fiber into an photoelectric converter. To 212.

  The photoelectric converter 212 converts the optical reception signal received via the WDM filter 211 into an RF signal.

  In addition, as shown in FIG. 4, the wireless transceiver module 220A as a transmission / reception device using the information transmission / reception device according to the present embodiment includes the information transmission / reception device 200A, a photoelectric converter 221 and a wireless antenna 222 as wireless interfaces. .

  The information transmitting / receiving apparatus 200A has the same configuration as the information transmitting / receiving apparatus 200A of the optical transceiver module 210A.

  The photoelectric converter 221 converts the optical transmission signal acquired from the first optical coupler 204 into an RF transmission signal.

  The wireless antenna 222 wirelessly transmits the RF transmission signal converted by the photoelectric converter 221 and transmits the RF reception signal received wirelessly to the baseband conversion circuit 206.

<Operation of Transceiver Module Using Information Transmitting / Receiving Device According to First Embodiment>
The operation of the optical transceiver module 210A using the information transmitting / receiving apparatus 200A according to the present embodiment will be described with reference to FIGS.

  First, an optical comb signal [a] (see FIG. 5A) having a plurality of optical spectra at frequency intervals (f) is generated from the optical frequency comb 201 of the information transmitting / receiving apparatus 200A. From the optical comb signal [a] generated by the optical frequency comb 201, optical carriers having a frequency interval nf (n is an arbitrary integer) (hereinafter referred to as “nf optical carrier”) are extracted by the number of transmission signals + 1. Two optical carriers having a frequency interval mf (m is an arbitrary integer) (hereinafter referred to as “mf optical carrier”) are extracted.

  When a digital transmission signal is transmitted in the optical transceiver module 210A, first, the number of digital transmission signals extracted here by the optical filter 202 by the optical modulators 203-1 and 203-2 of the information transmitting / receiving apparatus 200A (here, 2) nf optical carriers are respectively modulated by a plurality of digital transmission signals to be transmitted. For example, phase modulation is used for this light modulation.

  Next, a plurality of (here, two) nf optical carriers modulated by the optical modulators 203-1 and 203-2 by the first optical coupler 204 and one nf carrier extracted by the optical filter 202. The optical transmission signal [b] (see FIG. 5B) of the optical OFDM signal is generated by multiplexing.

  Then, the WDM filter 211 transmits the optical transmission signal [b] generated by the first optical coupler 204 to the transmission destination through the transmission optical fiber.

  Next, an operation when an optical reception signal is received in the optical transceiver module 210A will be described.

  In the second optical coupler 205, the two mf optical carriers extracted by the optical filter 202 are combined to generate an optical beat signal [c] having a frequency mf and sent to the baseband conversion circuit 206.

  When the optical reception signal [b ′] of the optical OFDM signal is received from the transmission optical fiber by the WDM filter 211, it is sent to the photoelectric converter 212.

  In the photoelectric converter 212, the optical reception signal [b '] of the optical OFDM signal received through the WDM filter 211 is converted into an RF reception signal [d] which is an RF OFDM signal.

  The RF reception signal [d] converted by the photoelectric converter 212 is sent to the baseband conversion circuit 206 of the information transmitting / receiving apparatus 200.

  In the baseband conversion circuit 206, an optical beat signal [c] (see FIG. 5C) of the frequency mf is acquired from the second optical coupler 205, received at the optical fiber interface, and converted into an RF OFDM signal. An RF reception signal [d] is acquired. In each optical carrier generated from the optical frequency comb 201, the wavelength arrangement of the optical carrier [d] for OFDM signal and the optical carrier [c] supplied to the baseband conversion circuit 206 is shown in FIG. 6 (A) or (B). .

  Then, in the baseband conversion circuit 206, the optical beat signal [c] is used as an interface signal and the RF reception signal [d] is beat-down processed to generate a baseband OFDM signal [e].

  [Processing Example 1] to [Processing Example 4] executed by the baseband conversion circuit 206 will be described with reference to FIGS.

[Processing Example 1]
In the baseband conversion circuit 206 shown in FIG. 7A, the optical beat signal [c] acquired from the second optical coupler 205 is converted by the photoelectric converter (PD) 2061, and then the RF reception signal [ d] is beat down to the baseband OFDM signal [e].

[Processing example 2]
7B uses a UTC-PD (Uni-Traveling-Carrier Photodiode) 2063, and the functions of the photoelectric converter (PD) 2061 in FIG. 7A and the mixer 2062 are used. By simultaneously realizing the above functions, beatdown to the baseband OFDM signal [e] is realized.

[Processing Example 3]
In the baseband conversion circuit 206 shown in FIG. 8, the optical beat signal [c] having the frequency mf acquired from the second optical coupler 205 is 2 by an optical filter composed of a circulator 2064 and an optical fiber Bragg grating (FBG) 2065. The optical carrier is separated into two optical carriers, and one optical carrier is modulated by the RF reception signal [d] in the LN modulator 2066. Here, phase modulation is used for modulation in the LN modulator 2066.

  Then, the modulated optical carrier and the other optical carrier separated by the optical filter are combined by the optical coupler 2067, and one sideband and the optical carrier are extracted by the optical filter 2068, and the photoelectric converter 2069 is obtained. To beat down to the baseband OFDM signal [e].

[Processing Example 4]
In the baseband conversion circuit 206 shown in FIG. 9, the two optical beat signals [c] having the frequency mf acquired from the second optical coupler 205 are modulated by the RF reception signal [d] in the LN modulator 2066. Here, phase modulation is used for modulation in the LN modulator 2066.

  Then, one sideband of the modulated two optical carriers and the other optical carrier are extracted by the optical filter 2068 and beat-down by the photoelectric converter 2069 to the baseband OFDM signal [e].

  Thus, the baseband OFDM signal [e] generated in the baseband conversion circuit 206 by any one of [Processing Example 1] to [Processing Example 4] is converted into a DFF (Discrete Fast Fourier Transform: Digital signal processing such as Discrete Fast Fourier Transform) is performed and demodulated, and a digital received signal to be input is generated.

  The operation of the wireless transceiver module 220A using the information transmitting / receiving apparatus 200A according to the present embodiment will be described with reference to FIG.

  The processing executed by the information transmitting / receiving apparatus 200A when information is transmitted / received in the wireless transceiver module 220A is the same as the processing executed by the information transmitting / receiving apparatus 200A of the optical transceiver module 210A described above, and detailed description thereof is omitted. To do.

  When the transmission signal is transmitted in the wireless transceiver module 220A, the optical transmission signal [b] of the optical OFDM signal generated by the first optical coupler 204 of the information transmitting / receiving apparatus 200A is converted into the RF transmission signal [ d] (see FIG. 5D) and transmitted from the wireless antenna 222 to the destination wireless transceiver module.

  Further, when the reception signal is received by the wireless transceiver module 220A, the RF reception signal [d] received from the wireless antenna 222 is transmitted to the baseband conversion circuit 206 of the information transmitting / receiving apparatus 200A, and the optical transceiver module 210A. A baseband OFDM signal [e] (see FIG. 5E) is generated in the baseband conversion circuit 206 by the same processing as that of the information transmitting / receiving apparatus 200A, and further demodulated in the digital signal processor 207 to be a digital input target. A received signal is generated.

  According to the present embodiment described above, the information transmission / reception device 200A that can be used for both wireless communication and optical fiber communication can be used for a large number of wireless transmission / reception devices and optical fiber transmission / reception devices installed in a broadband ubiquitous network. This makes it possible to efficiently manufacture a large number of transmission / reception devices.

<< Second Embodiment >>
As a second embodiment of the present invention, a configuration of a front end 230A of a high-speed wireless interface using the information transmitting / receiving apparatus 200A will be described with reference to FIG.

  As shown in FIG. 10, the front end 230A of the high-speed wireless interface is used in the information transmitting / receiving apparatus 200A having the same configuration as the information transmitting / receiving apparatus 200A described in the first embodiment and the optical transceiver module 210A according to the first embodiment. The WDM filter 211 and the photoelectric converter 212 that perform transmission / reception processing having functions similar to those of the WDM filter and the photoelectric converter, and the antenna 222 that performs transmission / reception processing wirelessly.

  In the front end 230A of the high-speed wireless interface configured as described above, when a transmission signal is transmitted through the transmission optical fiber, the optical transmission signal [b] generated by the first optical coupler 204 of the information transmitting / receiving apparatus 200A. Is transmitted to the transmission optical fiber by the WDM filter 211.

  When a reception signal is received from the transmission optical fiber, the received optical reception signal [b ′] is received by the photoelectric converter 212 via the WDM filter 211 and the RF reception signal [d]. Is transmitted to the baseband conversion circuit 206 of the information transmitting / receiving apparatus 200A, and a digital received signal to be input is generated by the same processing as the information transmitting / receiving apparatus 200A of the optical transceiver module 210A.

  When a reception signal is received wirelessly, the RF reception signal [d] received from the wireless antenna 222 is sent to the baseband conversion circuit 206 of the information transmission / reception device 200A, and the information transmission / reception device of the optical transceiver module 210A is transmitted. A digital received signal to be input is generated by the same processing as 200A.

  According to the second embodiment described above, by using the information transmitting / receiving apparatus 200A for the front end of the wireless interface, signals transmitted and received between the optical fiber and the wireless can be processed, and the manufacturing can be performed more efficiently. Can be constructed.

<< Third Embodiment >>
As shown in FIG. 11, the configuration of the optical transceiver module 210B using the information transmitting / receiving apparatus 200B according to the third embodiment of the present invention is the first optical coupler in the information transmitting / receiving apparatus 200A of the optical transceiver module 210A according to the first embodiment. Since the configuration is the same as that of the optical transceiver module 210A in the first embodiment except that a WDM filter (AWG: Arrayed Waveguide Grating) 208 is used instead of the WDM filter 204, detailed description of portions having the same functions is omitted. To do.

  The configuration of the wireless transceiver module 220B using the information transmitting / receiving apparatus 200B according to the present embodiment is changed to the first optical coupler 204 in the information transmitting / receiving apparatus 200A of the wireless transceiver module 220A according to the first embodiment, as shown in FIG. Since the configuration is the same as that of the wireless transceiver module 220A except that a WDM filter (AWG: Arrayed Waveguide Grating) 208 is used, detailed description of portions having the same functions is omitted.

  These WDM filters 208 multiplex a plurality of nf optical carriers modulated by the optical modulator 203 and one nf carrier extracted by the optical filter 202, and transmit an optical transmission signal [b] of the WDM signal. (See FIG. 5B). In the optical transmission signal of the WDM signal, the symbol rate of the modulation signal is set smaller than the frequency interval of the optical carrier so that the spectrum of each modulation signal does not overlap.

  Further, the digital signal processor 207 constitutes a digital filter to separate and demodulate the modulated signal of each optical carrier.

  According to the third embodiment described above, a WDM signal can be used as an optical transmission signal in the information transmitting / receiving apparatus 200B, and it can be used for various technologies.

<< 4th Embodiment >>
As a fourth embodiment of the present invention, a configuration of a front end 230B of a high-speed wireless interface using the information transmitting / receiving apparatus 200B will be described with reference to FIG.

  As shown in FIG. 13, the configuration of the front end 230B of the high speed wireless interface according to the present embodiment is a WDM instead of the first optical coupler 204 in the information transmitting / receiving apparatus 200A of the front end 230A of the high speed wireless interface according to the second embodiment. Except for the use of a filter (AWG: Arrayed Waveguide Grating) 208, the configuration is the same as the configuration of the front end 230A of the high-speed wireless interface, and therefore detailed description of portions having the same functions is omitted.

  According to the fourth embodiment described above, by using the information transmitting / receiving apparatus 200B for the front end of the wireless interface, a WDM signal can be used as an optical transmission signal, and signals transmitted and received between the optical fiber and the wireless Can be processed using various technologies, and a transceiver device that can be manufactured more efficiently can be constructed.

  Applying the optical heterodyne method using local light for demodulation of the OFDM signal or applying AWG as a WDM filter to the demodulation of the WDM signal makes it possible to use wireless communication and wired (optical fiber) communication. Since it is not a transmission / reception device configuration that can be used in common by both, an information transmission / reception device that can be used by both can be obtained by using the baseband conversion circuit and digital signal processing (DFF processing or digital filter) described in the above embodiment. It becomes possible to build.

DESCRIPTION OF SYMBOLS 1A, 1B ... Broadband ubiquitous network 10 ... Center station 20A, 20B ... Wireless base station 30 ... Wireless transceiver module 110 ... Optical transceiver module 200A, B ... Information transmitter / receiver 201 ... Optical frequency comb 202 ... Optical filter 203 ... Optical modulator DESCRIPTION OF SYMBOLS 204 ... 1st optical coupler 205 ... 2nd optical coupler 206 ... Baseband conversion circuit 207 ... Digital signal processor 208 ... WDM filter 210A, 210B ... Optical transceiver module 211 ... WDM filter 212 ... Photoelectric converter 220A, 220B ... Wireless Transceiver module 221 ... photoelectric converter 222 ... wireless antenna 230A, 230B ... front end 2061 ... photoelectric converter (PD)
2062 ... Mixer 2063 ... UTC-PD
2064: Circulator 2065: Optical fiber Bragg grating (FBG)
2066 ... LN modulator 2067 ... Optical coupler 2068 ... Optical filter 2069 ... Photoelectric converter

Claims (3)

In the information transmitting and receiving apparatus connected to at least one of the interfaces that can be connected to both the wireless interface for executing wireless communication and the wired interface for executing wired communication,
An optical frequency comb for generating an optical comb signal having a plurality of optical spectra at a constant frequency interval;
An optical filter that extracts a plurality of optical carriers from an optical comb signal generated by the optical frequency comb;
An optical modulator that superimposes a digital transmission signal to be transmitted on the optical carrier extracted by the optical filter;
Optical transmission for combining an optical carrier on which a digital transmission signal is superimposed by the optical modulator and an optical carrier extracted by the optical filter, and converting the optical carrier into an RF transmission signal for transmission at the wireless interface A first optical coupler that generates a signal or an optical transmission signal to be transmitted in the wired interface;
A second optical coupler for generating an optical beat signal by combining two optical carriers extracted by the optical filter;
Using the optical beat signal generated by the second optical coupler, an RF reception signal received at the wireless interface or an RF reception signal obtained by converting the optical reception signal received at the wired interface is converted into a baseband signal. A baseband conversion circuit that beats down,
An information transmission / reception apparatus comprising: a digital signal processor that demodulates an RF reception signal beat-down by the baseband conversion circuit into a digital signal. In the information transmitting device connected to at least one of the interfaces that can be connected to both the wireless interface for executing wireless communication and the wired interface for executing wired communication,
An optical frequency comb for generating an optical comb signal having a plurality of optical spectra at a constant frequency interval;
An optical filter that extracts a plurality of optical carriers from an optical comb signal generated by the optical frequency comb;
An optical modulator that superimposes a digital transmission signal to be transmitted on the optical carrier extracted by the optical filter;
Optical transmission for combining an optical carrier on which a digital transmission signal is superimposed by the optical modulator and an optical carrier extracted by the optical filter, and converting the optical carrier into an RF transmission signal for transmission at the wireless interface A first optical coupler that generates a signal or an optical transmission signal to be transmitted in the wired interface;
An information transmission device comprising: In the information receiving device connected to at least one of the interfaces that can be connected to both the wireless interface for executing the wireless communication and the wired interface for executing the wired communication,
An optical frequency comb for generating an optical comb signal having a plurality of optical spectra at a constant frequency interval;
An optical filter that extracts two optical carriers from an optical comb signal generated by the optical frequency comb;
A second optical coupler for generating an optical beat signal by combining two optical carriers extracted by the optical filter;
Using the optical beat signal generated by the second optical coupler, an RF reception signal received at the wireless interface or an RF reception signal obtained by converting the optical reception signal received at the wired interface is converted into a baseband signal. A baseband conversion circuit that beats down,
An information receiving apparatus comprising: a digital signal processor that demodulates an RF reception signal beat-down by the baseband conversion circuit into a digital signal.

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