A single-fiber bidirectional optical module

Abstract

The present invention discloses a single-fiber bidirectional optical module, which relates to the technical field of optical modules, and includes an external cavity tunable laser, a tunable filter, an optical fiber array, and a photodetector; the external cavity tunable laser is used to generate a first optical signal, the tunable filter is used to transmit the loaded first optical signal, the optical fiber array is used to receive the transmitted first optical signal and transmit it to the opposite end, and the photodetector is used to receive the reflected second optical signal and convert it into an electrical signal. The present invention realizes two pairing modes of the emission wavelength of the laser and the transmission wavelength of the tunable filter by setting the working state of the external cavity tunable laser and the tunable filter, so that one optical module can support two working modes. By allowing the optical module to work in different modes, a type of optical module can be used to realize single-fiber bidirectional transmission, eliminating the problem of non-operation of conventional single-fiber bidirectional modules with the same wavelength.

Description

Technical Field

[0001] The present invention relates to the technical field of optical modules, and in particular to a single-fiber bidirectional optical module. Background Art

[0002] The optical interface of the optical module usually has two types: dual-fiber bidirectional and single-fiber bidirectional. In the dual-fiber bidirectional module, the transmit signal and the receive signal are transmitted in two optical fibers, and their operating wavelengths are the same. In the single-fiber bidirectional module, the transmit signal and the receive signal are transmitted in the same optical fiber, and their operating wavelengths are different. The single-fiber bidirectional module uses only one optical fiber, but because the wavelengths emitted by the optical modules at both ends are different, two optical modules need to be used in the communication system, which increases the difficulty of system maintenance.

[0003] In order to achieve the standardization of single-fiber bidirectional module types, the industry has a solution that uses one wavelength for both the module's transmit and receive wavelengths, which is called a same-wavelength single-fiber bidirectional module. Figure 1 and Figure 2 There are two existing single-fiber bidirectional modules with the same wavelength. They use 50% splitters and circulators respectively to achieve the same wavelength for transmission and reception. Under these two structures, the reflection and scattering of the laser light emitted by the optical fiber will directly enter its own photodetector, causing serious interference to the receiving performance of the optical module. Since the communication system cannot control the reflection and scattering state of the optical fiber, there is a risk that the single-fiber bidirectional module with the same wavelength will not work properly in the actual network. Therefore, a single-fiber bidirectional optical module solution that supports type normalization is needed, while eliminating the performance risks of conventional single-fiber bidirectional optical modules with the same wavelength. Summary of the invention

[0004] The present invention provides a single-fiber bidirectional optical module, which solves the problem of the risk of abnormal operation of the existing single-fiber bidirectional modules with the same wavelength.

[0005] The present invention provides a single-fiber bidirectional optical module, comprising an external cavity tunable laser, a tunable filter, an optical fiber array and a photodetector;

[0006] The external cavity tunable laser is used to generate a first optical signal;

[0007] A modulation component is provided between the tunable laser and the tunable filter, and the modulation component is used to receive the first optical signal and load a transmission signal thereon;

[0008] The tunable filter is used to transmit the first optical signal loaded with the transmission signal, and the optical fiber array is used to receive the transmitted first optical signal and transmit it to the opposite end; the optical fiber array is also used to receive the second optical signal transmitted from the opposite end, and the tunable filter is also used to reflect the second optical signal;

[0009] The photodetector is used to receive the reflected second light signal and convert it into an electrical signal;

[0010] The working state of the tunable filter includes a first working state and a second working state, the optical signal transmission wavelength of the first working state is the optical signal reflection wavelength of the second working state, and the optical signal transmission wavelength of the second working state is the optical signal reflection wavelength of the first working state;

[0011] The working mode of the optical module includes a first working mode and a second working mode. When the optical module is in the first working mode, the working state of the tunable filter is in the first working state. When the optical module is in the second working mode, the working state of the tunable filter is in the second working state.

[0012] The first optical signal generated by the external cavity tunable laser and the working state of the tunable filter are corresponded, and when the two optical modules are in two different working modes, single-fiber bidirectional transmission is achieved.

[0013] Preferably, the external cavity tunable laser comprises a gain medium and a tunable external cavity, the gain medium and the tunable external cavity are connected by lens coupling or direct end face coupling, the tunable filter is an N-channel tunable filter, the optical fiber array is an N-channel optical fiber array, and the photodetector is an N-channel photodetector.

[0014] Preferably, when the tunable filter is in the first working state, the transmission wavelength of its optical signal is a±nT, and the reflection wavelength is b±nT; when the tunable filter is in the second working state, the transmission wavelength of its optical signal is b±nT, and the reflection wavelength is a±nT, where n is a positive integer and T is the period of the filtering curve.

[0015] Preferably, when the optical module is in the first working mode, the wavelength of the first optical signal is any one of a±nT, the wavelength of the second optical signal is a corresponding one of b±nT, and the tunable filter is in the first working state, transmitting the first optical signal and reflecting the second optical signal;

[0016] When the optical module is in the second working mode, the wavelength of the first optical signal is any one of b±nT, the wavelength of the second optical signal is a corresponding one of a±nT, and the tunable filter is in the second working state, transmitting the first optical signal and reflecting the second optical signal.

[0017] Preferably, when the tunable filter is in the first working state, its optical signal transmission band is band 1, and all wavelengths outside band 1 are reflected; when the tunable filter is in the second working state, its optical signal transmission band is band 2, and all wavelengths outside band 2 are reflected.

[0018] Preferably, when the optical module is in the first working mode, the first optical signal has a wavelength within band 1, and the tunable filter is in the first working state, transmitting the first optical signal and reflecting optical signals outside band 1;

[0019] When the optical module is in the second working mode, the first optical signal has a wavelength within band 2, and the tunable filter is in the second working state, transmitting the first optical signal and reflecting optical signals outside band 2.

[0020] Preferably, the modulation component supports N parallel channels to work simultaneously, and the modulation component specifically includes:

[0021] an isolator for eliminating optical signals reflected back into the tunable external cavity;

[0022] A 1×N optical splitter, configured to receive the first optical signal and split it into N equal parts;

[0023] The N-channel modulator is used to receive the equally divided first optical signal and load the corresponding transmission signal onto it.

[0024] Preferably, the optical module includes the following implementations:

[0025] The tunable external cavity, the N-channel tunable filter and the N-channel photodetector are integrated in separate chips respectively, and the 1×N optical splitter and the N-channel modulator are integrated in a modulator chip;

[0026] The tunable external cavity is integrated in a separate chip, and the 1×N optical splitter, N-channel modulator, N-channel tunable filter and N-channel photodetector are integrated in one chip;

[0027] The tunable external cavity and the N-channel tunable filter are integrated in one chip, and the 1×N optical splitter, the N-channel modulator and the N-channel photodetector are integrated in another chip;

[0028] The tunable external cavity, 1×N optical splitter and N-channel tunable filter are integrated in one chip, and the N-channel modulator and N-channel photodetector are integrated in another chip;

[0029] The tunable external cavity, the N-channel tunable filter, the 1×N optical splitter, the N-channel modulator and the N-channel photodetector are integrated in one chip.

[0030] Preferably, the optical module further includes:

[0031] An N-channel tunable laser, used for transmitting first optical signals of N different wavelengths;

[0032] An N-channel modulator, used for receiving N first optical signals and loading corresponding transmission signals thereon;

[0033] A combiner, used for combining the N loaded first optical signals;

[0034] an isolator for eliminating optical signals reflected back into the tunable external cavity;

[0035] N wavelength tunable filters are used to transmit the converged N first optical signals and enter the optical fiber to transmit them to the opposite end;

[0036] The optical fiber is also used to receive the N second optical signals emitted from the opposite end after being converged, and the N wavelength tunable filter is also used to reflect the N second optical signals after being converged;

[0037] A wave splitter, used for receiving the reflected and converged N second optical signals and decomposing them;

[0038] The N-channel photoelectric detector is used to receive the decomposed N second optical signals and convert them into electrical signals.

[0039] Preferably, the optical module also includes the following implementations:

[0040] The N-channel modulator and the N-channel photodetector are integrated in a separate chip, the N-channel tunable external cavity and the combiner are integrated in one chip, and the N-wavelength tunable filter and the splitter are integrated in another chip;

[0041] The N-channel tunable external cavity, the combiner and the N-channel modulator are integrated in one chip, and the N-wavelength tunable filter, the splitter and the N-channel photodetector are integrated in another chip;

[0042] The N-channel tunable external cavity, the wave combiner, the N-channel modulator, the N-wavelength tunable filter, the wave splitter and the N-channel photoelectric detector are all integrated in one chip.

[0043] Compared with the prior art, the present invention has the following beneficial effects:

[0044] The present invention includes an external cavity tunable laser, a tunable filter, an optical fiber array and a photodetector. The working state of the tunable filter includes a first working state and a second working state. Specifically, the optical signal transmission wavelength of the first working state is the optical signal reflection wavelength of the second working state, and the optical signal transmission wavelength of the second working state is the optical signal reflection wavelength of the first working state. The optical module working mode includes a first working mode and a second working mode. Specifically, when the optical module is in the first working mode, the working state of the tunable filter is the first working state, and when the optical module is in the second working mode, the working state of the tunable filter is the second working state. Therefore, the present invention realizes two pairing modes of the emission wavelength of the laser and the transmission wavelength of the tunable filter by setting the working state of the external cavity tunable laser and the tunable filter, so that one optical module can support two working modes. By allowing the optical module to work in different modes, a type of optical module can be used to realize single-fiber bidirectional transmission, eliminating the problem of non-operation of conventional single-fiber bidirectional modules with the same wavelength. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 It is a schematic diagram of the structure of an existing single-fiber bidirectional module with the same wavelength;

[0047] Figure 2 It is a schematic diagram of another existing single-fiber bidirectional module with the same wavelength;

[0048] Figure 3 This is a schematic diagram of the structure of a single-fiber bidirectional optical module according to Embodiment 1 of the present invention;

[0049] Figure 4 is a first filtering curve of the adjustable filter of embodiment 1 of the present invention;

[0050] Figure 5 is the second filtering curve of the adjustable filter of embodiment 1 of the present invention;

[0051] Figure 6 This is a schematic diagram of a first implementation of a single-fiber bidirectional optical module according to Embodiment 1 of the present invention;

[0052] Figure 7 This is a schematic diagram of a second implementation of a single-fiber bidirectional optical module according to Embodiment 1 of the present invention;

[0053] Figure 8This is a schematic diagram of a third implementation of the single-fiber bidirectional optical module of Embodiment 1 of the present invention;

[0054] Fig. 9 This is a schematic diagram of a fourth implementation of a single-fiber bidirectional optical module according to Embodiment 1 of the present invention;

[0055] Fig.10 This is a schematic diagram of a fifth implementation of the single-fiber bidirectional optical module of Embodiment 1 of the present invention;

[0056] Fig.11 This is a schematic diagram of the structure of a single-fiber bidirectional optical module according to Embodiment 2 of the present invention;

[0057] Fig.12 This is a schematic diagram of a first implementation of a single-fiber bidirectional optical module according to Embodiment 2 of the present invention;

[0058] Fig.13 This is a schematic diagram of a second implementation of a single-fiber bidirectional optical module according to Embodiment 2 of the present invention;

[0059] Fig.14 This is a schematic diagram of a third implementation method of a single-fiber bidirectional optical module according to Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0060] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0061] The present invention proposes a self-tuning optical module supporting multi-channel simultaneous operation, wherein the emission and reception wavelengths of the module can be interchanged or adjusted within a relatively small wavelength interval, thereby realizing a single-fiber bidirectional optical module with standardized types.

[0062] Example 1

[0063] Reference Figure 3 The present invention provides a single-fiber bidirectional optical module, specifically an N-channel parallel self-tuning single-fiber bidirectional optical module. Its main functional units include a gain medium, a tunable external cavity, an isolator, a 1×N optical splitter, an N-channel modulator, an N-channel tunable filter, an N-channel photodetector, and an N-channel optical fiber array. The gain medium and the tunable external cavity form an external cavity tunable laser. The gain medium is a substance that generates light energy. The gain medium and the tunable external cavity can be connected by a Figure 3The light emitted from the tunable external cavity passes through the isolator, and its energy is divided into N equal parts by the optical splitter, and enters the N-channel modulator, which is loaded with the signal to be transmitted. The N-channel modulated light is transmitted through the tunable filter and enters the corresponding optical fiber in the optical fiber array. The N-channel optical signal received from the optical fiber array is reflected by the tunable filter, enters the N-channel photodetector, and is converted into an electrical signal.

[0064] The tunable filter has two working states and can be switched between the two states as required, thereby realizing a self-tuning function. Figure 4 It is the first filter curve of the tunable filter, which is periodic, and the transmittance of the two states is complementary. The transmission wavelength of filter state 1 is a±nT, and the reflection wavelength is b±nT. The transmission wavelength of filter state 2 is b±nT, and the reflection wavelength is a±nT. So for a specific wavelength, when filter state 1 is transmission, filter state 2 is reflection. When filter state 1 is reflection, filter state 2 is transmission. n is a positive integer, and T is the period of the filter curve.

[0065] Based on the first filtering curve of the tunable filter, the optical module of this embodiment can have two working modes. When the optical module is in working mode A, the external cavity tunable laser composed of the gain medium and the tunable external cavity emits any one of the wavelengths a±nT, and the tunable filter is in filtering state 1, which transmits the wavelength a±nT. At this time, the emission wavelength of the optical module is a±nT, and the received wavelength is b±nT. When the optical module is in working mode B, the external cavity tunable laser composed of the gain medium and the tunable external cavity emits any one of the wavelengths b±nT, and the tunable filter is in filtering state 2, which transmits the wavelength b±nT. At this time, the emission wavelength of the optical module is b±nT, and the received wavelength is a±nT. Since the transmission curves of filtering state 1 and filtering state 2 are opposite, the self-tuning optical module of mode A can receive the emission wavelength of the self-tuning optical module of mode B, and the self-tuning optical module of mode B can receive the emission wavelength of the self-tuning optical module of mode A. Therefore, by setting the parameters of the tunable external cavity and the tunable filter (the tunable filter parameters are set by voltage or current), when the two self-tuning optical modules work in mode A and mode B respectively, single-fiber bidirectional transmission can be achieved.

[0066] Reference Figure 5, each filtering state has only one transmission wavelength. The transmission band of filtering state 1 is band 1, and the remaining wavelengths are reflected. The transmission band of filtering state 2 is band 2, and the remaining wavelengths are reflected. Based on the second filtering curve of the tunable filter, the optical module of this embodiment can have two working modes. When the optical module is in working mode C, the external cavity tunable laser composed of the gain medium and the tunable external cavity emits a wavelength within band 1, such as x, and the tunable filter is in filtering state 1, which transmits wavelength x. Then the emission wavelength of the optical module is x at this time, and wavelengths outside band 1 are received. When the optical module is in working mode D, the external cavity tunable laser composed of the gain medium and the tunable external cavity emits a wavelength within band 2, such as y, and the tunable filter is in filtering state 2, which transmits wavelength y. Then the emission wavelength of the optical module is y at this time, and wavelengths outside band 2 are received. Since band 1 and band 2 do not overlap, mode C can receive the emission wavelength of mode D, and mode D can receive the emission wavelength of mode C. By setting the parameters of the tunable external cavity and the tunable filter, when the two self-tuning optical modules work in mode C and mode D respectively, single-fiber bidirectional transmission can be achieved.

[0067] The emission wavelength of the external cavity laser is determined by the external cavity and has nothing to do with the gain medium. Therefore, within the operating temperature range of the module, the emission wavelength can be controlled by controlling the working state of the external cavity. The functional units in this embodiment can be placed in one or more chips, thereby eliminating the coupling interface between the functional units as much as possible, reducing the coupling loss in the optical path, and reducing the difficulty of packaging. Figure 6 to Figure 10 These are five typical chip implementations of this embodiment, and the remaining implementations also fall within the protection scope of the present invention. Figure 6 The tunable external cavity, the N-channel tunable filter, and the N-channel photodetector are each a separate chip, and the 1×N optical splitter and the N-channel modulator constitute a modulator chip. Figure 7 The tunable external cavity is a separate chip, and the 1×N optical splitter, N-channel modulator, N-channel tunable filter and N-channel photodetector are integrated in one chip. Figure 8 The tunable external cavity and the N-channel tunable filter are integrated in chip 1 , and the 1×N optical splitter, the N-channel modulator and the N-channel photodetector are integrated in chip 2 . Fig. 9 The tunable external cavity, the 1×N optical splitter and the N-channel tunable filter are integrated in chip 1 , and the N-channel modulator and the N-channel photodetector are integrated in chip 2 . Fig.10 A tunable external cavity, an N-channel tunable filter, a 1×N optical splitter, an N-channel modulator and an N-channel photodetector are integrated in one chip.

[0068] Example 2

[0069] Reference Fig.11 , Fig.11The self-tuning single-fiber bidirectional optical module for wavelength division multiplexing of N wavelengths has N gain media, N-channel tunable external cavities, N-channel modulators, combiners, isolators, N-wavelength tunable filters, splitters, N-channel photodetectors and optical fibers. The gain medium of each channel and its corresponding tunable external cavity form an external cavity tunable laser. The two functional units can be coupled by lenses or directly end-faceted as shown in the figure. Each external cavity tunable laser emits different wavelengths. The N-channel light emitted from the N-channel tunable external cavity enters the N-channel modulator and is loaded with the signal to be transmitted. The modulated N wavelengths of light are converged by the combiner and passed through the isolator, and then transmitted into the optical fiber by the tunable filter. The N wavelengths of light received from the optical fiber are reflected by the tunable filter and enter the splitter. The demultiplexed N wavelengths of light enter the N-channel photodetector and are converted into electrical signals.

[0070] The tunable filter used in Example 2 is the same as that in Example 1, and the working principle of each wavelength is also the same as that of any channel in Example 1. The functional units in Example 2 can be placed in one or more chips, so as to eliminate the coupling interface between the functional units as much as possible, reduce the coupling loss in the optical path, and reduce the difficulty of packaging. Figure 12 to Figure 14 These are three typical chip implementations of Example 2, and the remaining implementations also fall within the protection scope of the present invention. Fig.12 The N-channel modulator and the N-channel photodetector are each a separate chip, the N-channel tunable external cavity and the combiner are integrated in chip 1, and the N-wavelength tunable filter and the splitter are integrated in chip 2. Fig.13 The N-channel tunable external cavity, the combiner and the N-channel modulator are integrated in chip 1 , and the N-wavelength tunable filter, the splitter and the N-channel photodetector are integrated in chip 2 . Fig.14 The N-channel tunable external cavity, the combiner, the N-channel modulator, the N-wavelength tunable filter, the splitter and the N-channel photodetector are all integrated in one chip.

[0071] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0072] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A single-fiber bidirectional optical module, characterized in that: Includes external cavity tunable lasers, tunable filters, fiber arrays, and photodetectors; The external cavity tunable laser is used to generate a first optical signal; A modulation component is provided between the tunable laser and the tunable filter, and the modulation component is used to receive the first optical signal and load a transmission signal thereon; The tunable filter is used to transmit the first optical signal loaded with the transmission signal, and the optical fiber array is used to receive the transmitted first optical signal and transmit it to the opposite end; the optical fiber array is also used to receive the second optical signal transmitted from the opposite end, and the tunable filter is also used to reflect the second optical signal; The photodetector is used to receive the reflected second light signal and convert it into an electrical signal; The working state of the tunable filter includes a first working state and a second working state, the optical signal transmission wavelength of the first working state is the optical signal reflection wavelength of the second working state, and the optical signal transmission wavelength of the second working state is the optical signal reflection wavelength of the first working state; The working mode of the optical module includes a first working mode and a second working mode. When the optical module is in the first working mode, the working state of the tunable filter is in the first working state. When the optical module is in the second working mode, the working state of the tunable filter is in the second working state. The first optical signal generated by the external cavity tunable laser and the working state of the tunable filter are corresponded, and when the two optical modules are in two different working modes, single-fiber bidirectional transmission is achieved.

2. A single-fiber bidirectional optical module as claimed in claim 1, characterized in that: The external cavity tunable laser comprises a gain medium and a tunable external cavity, the gain medium and the tunable external cavity are connected in a lens coupling or a direct end face coupling manner, the tunable filter is an N-channel tunable filter, the optical fiber array is an N-channel optical fiber array, and the photodetector is an N-channel photodetector.

3. A single-fiber bidirectional optical module as claimed in claim 1, characterized in that: When the tunable filter is in the first working state, its optical signal transmission wavelength is a ± nT, reflection wavelength is b ± nT, when the tunable filter is in the second working state, its optical signal transmission wavelength is b ± nT, the reflection wavelength is a ± nT, where n is a positive integer and T is the period of the filter curve.

4. A single-fiber bidirectional optical module as claimed in claim 3, characterized in that: When the optical module is in the first working mode, the wavelength of the first optical signal is a ± any one of b±nT, the wavelength of the second optical signal is a corresponding one of b±nT, the tunable filter is in a first working state, transmits the first optical signal, and reflects the second optical signal; When the optical module is in the second working mode, the wavelength of the first optical signal is b ± Any one of nT, the wavelength of the second optical signal is a ± For a corresponding one of nT, the tunable filter is in a second working state, transmitting the first optical signal and reflecting the second optical signal.

5. A single-fiber bidirectional optical module as claimed in claim 1, characterized in that: When the tunable filter is in the first working state, its optical signal transmission band is band 1, and all wavelengths outside band 1 are reflected. When the tunable filter is in the second working state, its optical signal transmission band is band 2, and all wavelengths outside band 2 are reflected.

6. A single-fiber bidirectional optical module as claimed in claim 5, characterized in that: When the optical module is in the first working mode, the first optical signal has a wavelength within band 1, and the tunable filter is in the first working state, transmitting the first optical signal and reflecting optical signals outside band 1; When the optical module is in the second working mode, the first optical signal has a wavelength within band 2, and the tunable filter is in the second working state, transmitting the first optical signal and reflecting optical signals outside band 2.

7. A single-fiber bidirectional optical module as claimed in claim 2, characterized in that: The modulation component supports N parallel channels to work simultaneously, and the modulation component specifically includes: an isolator for eliminating optical signals reflected back into the tunable external cavity; A 1×N optical splitter, configured to receive the first optical signal and split it into N equal parts; The N-channel modulator is used to receive the equally divided first optical signal and load the corresponding transmission signal onto it.

8. A single-fiber bidirectional optical module as claimed in claim 7, characterized in that: The optical module includes the following implementation methods: The tunable external cavity, the N-channel tunable filter and the N-channel photodetector are integrated in separate chips respectively, and the 1×N optical splitter and the N-channel modulator are integrated in a modulator chip; The tunable external cavity is integrated in a separate chip, and the 1×N optical splitter, N-channel modulator, N-channel tunable filter and N-channel photodetector are integrated in one chip; The tunable external cavity and the N-channel tunable filter are integrated in one chip, and the 1×N optical splitter, the N-channel modulator and the N-channel photodetector are integrated in another chip; The tunable external cavity, 1×N optical splitter and N-channel tunable filter are integrated in one chip, and the N-channel modulator and N-channel photodetector are integrated in another chip; The tunable external cavity, the N-channel tunable filter, the 1×N optical splitter, the N-channel modulator and the N-channel photodetector are integrated in one chip.

9. A single-fiber bidirectional optical module as claimed in claim 2, characterized in that: The optical module further includes: An N-channel tunable laser, used for transmitting first optical signals of N different wavelengths; An N-channel modulator, used for receiving N first optical signals and loading corresponding transmission signals thereon; A combiner, used for combining the N loaded first optical signals; an isolator for eliminating optical signals reflected back into the tunable external cavity; N wavelength tunable filters are used to transmit the converged N first optical signals and enter the optical fiber to transmit them to the opposite end; The optical fiber is also used to receive the N second optical signals emitted from the opposite end after being converged, and the N wavelength tunable filter is also used to reflect the N second optical signals after being converged; A wave splitter, used for receiving the reflected and converged N second optical signals and decomposing them; The N-channel photoelectric detector is used to receive the decomposed N second optical signals and convert them into electrical signals.

10. A single-fiber bidirectional optical module as claimed in claim 9, characterized in that: The optical module also includes the following implementation methods: The N-channel modulator and the N-channel photodetector are integrated in a separate chip, the N-channel tunable external cavity and the combiner are integrated in one chip, and the N-wavelength tunable filter and the splitter are integrated in another chip; The N-channel tunable external cavity, the combiner and the N-channel modulator are integrated in one chip, and the N-wavelength tunable filter, the splitter and the N-channel photodetector are integrated in another chip; The N-channel tunable external cavity, the wave combiner, the N-channel modulator, the N-wavelength tunable filter, the wave splitter and the N-channel photoelectric detector are all integrated in one chip.

Images