An optical disc library system that directly transmits optical storage laser signals through optical fibers

Abstract

The present invention discloses an optical disc library system that directly transmits optical storage laser signals through optical fibers. The laser signals containing data information reflected from the data optical disc are coupled to the optical fibers through a coupling lens, and the optical pulse signals are transmitted in the optical fibers to an optical fiber transmitter composed of a wavelength division multiplexer, a semiconductor amplifier, and an adjustable bandpass filter, which converts the wavelength of the blue light signals containing data information to the optical fiber communication wavelength, and then conducts optical fiber communication transmission. When it is transmitted to the server side, the photoelectric effect of a photodiode (PIN) is used to convert the optical signal into an electrical signal, and then through a signal amplifier, a DSP digital signal processor, and a decoding chip, the final stored data is obtained. The propagation link of the present invention is simple, has strong anti-interference ability, effectively improves the reliability of data propagation, and solves problems such as speed bottlenecks and low transparency.

Description

Technical Field

[0001] The present invention relates to a Blu-ray disc library device, and in particular to an optical disc library system that directly transmits optical storage laser signals through optical fibers. Background Art

[0002] Existing optical disc libraries have an optical head and an optical disc arranged opposite to each other. Inside the optical head, a blue laser (LD) module, a beam splitting prism, a collimating lens, and an objective lens are sequentially arranged. On one side of the beam splitting prism, a collimating and focusing lens, a semi-transmissive and semi-reflective mirror, an astigmatic lens group, and a photodetector (PDIC) are sequentially arranged. The laser beam emitted by the LD module passes through the beam splitting prism and then forms a parallel beam after passing through the collimating lens and reaches the objective lens, forming an image point in front of the objective lens. The image point is a plurality of light spots arranged in a straight line, and the main light spot is used for reading and writing on the optical disc; when the optical disc is at the image plane of the objective lens, the laser signal reflected from the optical disc passes through the objective lens, the collimating lens in sequence, and then is reflected by the beam splitting prism and focused by the collimating and focusing lens, and then passes through the semi-transmissive and semi-reflective mirror to reach the astigmatic lens group. The astigmatic lens group forms different astigmatic spots on the PDIC according to different convergence states of the light beam, and the PDIC performs optoelectronic conversion signal processing on the astigmatic spots to generate a servo control signal and an optical disc library product storage data (RF data) signal. The transmission process of the RF data signal is first processed by DSP digital signal processing and decoded by a single-chip microcomputer chip to reach the SATA interface; then, an amplitude shift keying method is used with an optical fiber transmitter to modulate the SATA bus data into an optical pulse signal through a light-emitting diode or an injection laser, and then the optical pulse signal is transmitted along the line in the optical fiber medium; finally, through optoelectronic conversion again, the optical fiber signal is converted into an electrical signal, passes through the photodiode (PIN) of the optical receiver on the server side, and uses the photoelectric effect of the semiconductor to restore the optical signal into an electrical signal, and then the electrical signal is amplified to basically restore the electrical signal. The propagation link for storing data in existing optical disc library products is complex, resulting in problems such as low reliability, poor anti-interference ability, speed bottleneck, and low transparency. Summary of the Invention

[0003] In order to solve the above technical problems existing in the prior art, the present invention provides an optical disc library system that directly transmits optical storage laser signals through optical fibers.

[0004] The technical solution of the present invention is: an optical disc library system that directly transmits optical storage laser signals through optical fibers. There are an optical head and an optical disc arranged opposite to each other. Inside the optical head, an LD module, a beam splitting prism, a collimating lens, and an objective lens are sequentially arranged. On one side of the beam splitting prism, a collimating and focusing lens, a semi-transmissive and semi-reflective mirror, an astigmatic lens group, and a photodetector are sequentially arranged. In the reflection optical path of the semi-transmissive and semi-reflective mirror, a coupling lens and a first optical fiber are sequentially arranged. The first optical fiber is connected to the first input end of a wavelength division multiplexer. A detection light emission module with a target optical fiber wavelength is provided. The detection light emission module is connected to the second input end of the wavelength division multiplexer through a second optical fiber. The wavelength division multiplexer combines the signals transmitted by the first optical fiber and the second optical fiber. The output end of the wavelength division multiplexer is sequentially connected to a semiconductor amplifier and an adjustable bandpass filter through a third optical fiber. The optical fiber signal output by the bandpass filter sequentially passes through an optical detector, a signal amplifier, a DSP digital signal processor, and a decoding chip to output the final stored data.

[0005] The coupling lens adopts a double-lens coupling method of a first lens and a second lens. The first lens turns the light beam into parallel light, and the second lens focuses the parallel light. An isolator is arranged between the first lens and the second lens. The end face of the first optical fiber is located at the focusing focal point position when the light beam with a wavelength of 404 nm passes through the second lens.

[0006] The wavelength division multiplexer is provided with a housing. Inside the housing, an interference filter composed of a multilayer dielectric film filter with a wavelength selection characteristic of 404 nm is provided. The first input end and the second input end are respectively arranged on opposite sides of the interference filter, and the output end is on the same side as the second input end.

[0007] In the present invention, the laser signal containing data information reflected from the data optical disc is coupled to the optical fiber through the coupling lens, and the optical pulse signal is transmitted in the optical fiber to a fiber optic transmitter composed of a wavelength division multiplexer, a semiconductor amplifier, and an adjustable bandpass filter to convert the wavelength of the blue light signal containing data information to the fiber optic communication wavelength, and then perform fiber optic communication transmission. When it is transmitted to the server side, the photoelectric effect of a photodiode (PIN) is used to convert the optical signal into an electrical signal, and then through a signal amplifier, a DSP digital signal processor, and a decoding chip, the final stored data is obtained. The propagation link of the present invention is simple, has strong anti-interference ability, effectively improves the reliability of data propagation, and solves problems such as speed bottleneck and low transparency. Description of the Drawings

[0008] Figure 1 It is a schematic structural diagram of an embodiment of the present invention.

[0009] Figure 2 、 Figure 3 It is a circuit diagram of an embodiment of the present invention.

[0010] Figure 4 It is a schematic structural diagram of the coupling lens part of an embodiment of the present invention.

[0011] Figure 5 It is a schematic structural diagram of the wavelength division multiplexer of an embodiment of the present invention. Detailed implementation manners

[0012] An optical disc library system for directly transmitting an optical storage laser signal through an optical fiber according to the present invention is as Figure 1 , 2 , as shown in Fig. 3. The same as the prior art, there are an optical head 1 and an optical disc 2 arranged oppositely. An LD module 1-1, a beam splitting prism 1-2, a collimating lens 1-3 and an objective lens 1-4 are sequentially arranged in the optical head 1. A collimating and focusing lens 1-5, a semi-transmissive and semi-reflective mirror 1-6, an astigmatic lens group 1-7 and a photodetector 1-8 are sequentially arranged on one side of the beam splitting prism 1-2. Different from the prior art, a coupling lens 3 and a first optical fiber 4 are sequentially arranged in the reflection optical path of the semi-transmissive and semi-reflective mirror 1-6. The first optical fiber 4 is connected to the first input end 5-1 of the wavelength division multiplexer 5. A detection light emission module 6 for the target optical fiber wavelength is provided, which emits the target optical fiber communication wavelength, such as 850 nm, 1310 nm, 1550 nm.

[0013] The detection light emission module 6 for the target optical fiber wavelength is connected to the second input end 5-2 of the wavelength division multiplexer 5 through a second optical fiber 7. The wavelength division multiplexer 5 combines the signals of the first optical fiber 4 and the second optical fiber 7. The output end 5-3 of the wavelength division multiplexer 5 is sequentially connected to a semiconductor amplifier 9 and an adjustable band-pass filter 10 through a third optical fiber 8. The optical fiber signal output by the band-pass filter 10, that is, the optical fiber signal for communication sent from the optical fiber transmitter, is transmitted to the server side through optical fiber communication and then sequentially passes through an optical detector 11, a signal amplifier 12, a DSP digital signal processor 13 and a decoding chip 14 to output the final stored data.

[0014] The coupling lens 3 of the embodiment of the present invention can be as Figure 4 shown, adopting a double-lens coupling method of a first lens 3-1 and a second lens 3-2. The first lens 3-1 turns the light beam into parallel light, and the second lens 3-2 focuses the parallel light. An isolator 3-3 is arranged at any position between the first lens 3-1 and the second lens 3-2. The end face of the first optical fiber 4 is located at the focusing focal point position when the light beam with a wavelength of 404 nm passes through the second lens 3-2.

[0015] The wavelength division multiplexer 5 of the embodiment of the present invention can be as Figure 5As shown in the figure, there is a housing 5-4, and inside the housing 5-4, there is an interference filter 5-5 composed of a multilayer dielectric film filter with a wavelength selection characteristic of 404 nm. The first input end 5-1 and the second input end 5-2 are respectively arranged on the opposite sides of the interference filter 5-5, and the output end 5-3 is on the same side as the second input end 5-2.

[0016] Working process:

[0017] The laser beam emitted by the LD module 1-1 passes through the beam splitting prism 1-2, and then forms a parallel beam after passing through the collimating lens 1-3 and reaches the objective lens 1-4, forming an image point in front of the objective lens 1-4. The image point is a plurality of light spots arranged in a straight line. The main light spot is used for optical disc reading and writing; the laser signal reflected from the optical disc 2 passes through the objective lens 1-4, the collimating lens 1-3 in sequence, and then passes through the reflection of the beam splitting prism 1-2 and the focusing of the collimating and focusing lens 1-5, and reaches the semi-transmissive and semi-reflective mirror 1-6. The beam is divided into two paths by the semi-transmissive and semi-reflective mirror 1-6: one path of light passes through the semi-transmissive and semi-reflective mirror 1-6 and reaches the astigmatic lens group 1-7. The astigmatic lens group 1-7 forms different astigmatic spots on the photodetector (PDIC) according to different convergence states of the beam, generating a focusing error signal and a track following error signal; the other path is reflected by the semi-transmissive and semi-reflective mirror 1-6 to the coupling lens 3, and couples the laser signal containing data information reflected from the data optical disc to the first optical fiber 4, so that the laser pulse signal containing data information is transmitted in the first optical fiber 4.

[0018] The laser pulse signal with a wavelength of 404 nm containing data information enters the housing 5-4 from the first input end 5-1 of the wavelength division multiplexer 5, passes through the interference filter 5-5 composed of a multilayer dielectric film filter with a 404 nm selection characteristic, and is output from the output end 5-3. At this time, the target optical fiber wavelength (not a specific wavelength of 404 nm) emitted by the detection light emission module 6 is input from the second input end 5-2 through the second optical fiber 7, and is reflected because it cannot pass through the interference filter 5-5 and is also output from the output end 5-3, that is, the laser pulse signal with a wavelength of 404 nm containing data information is combined with the target optical fiber wavelength detection light signal. The combined signal enters the third optical fiber 8 and passes through the semiconductor optical amplifier 9, and the wavelength conversion is realized by changing its gain parameter. Then, it passes through the tunable band-pass filter 10 to filter out the original laser containing data information, and filter out the converted optical fiber signal, completing the conversion of the input laser data signal from the wavelength of 404 nm to the optical fiber communication wavelengths of 850 nm, 1310 nm, and 1550 nm, and then performing optical fiber communication transmission through the third optical fiber 8.

[0019] The principle of wavelength conversion is as follows: When the input blue light signal containing data is at high power (logic 1), due to stimulated emission, the consumption of carriers in the semiconductor optical amplifier 9 increases correspondingly, and the carrier concentration decreases, resulting in a decrease in its gain and gain saturation. At this time, the probe light of the target fiber wavelength cannot be amplified (logic 0); on the contrary, when the input blue light signal of the data is at logic 0, the probe light of the target fiber wavelength is amplified (logic 1). Therefore, the input data information realizes wavelength conversion, and the output signal is logically opposite to the original signal and the bit stream is inverted.

[0020] When the optical fiber signal is transmitted to the server, signal reception and conversion are performed. First, the optical fiber signal enters the optical detector 11. The photodiode (PIN) in the optical detector 11 uses the photoelectric effect of the semiconductor to restore the optical fiber signal into an electrical signal. Then, the signal amplifier 12 amplifies and processes the electrical signal, and restores the electrical signal to the RF data signal with basically no attenuation. The RF data signal is converted into a digital signal by the DSP digital signal processor 13, and then decoded by the decoding chip (single-chip microcomputer chip) to obtain the final stored data.

Claims

1. An optical disc library system that directly transmits an optical storage laser signal through an optical fiber, with an optical head (1) and an optical disc (2) arranged opposite to each other. Inside the optical head (1), an LD module (1-1), a beam-splitting prism (1-2), a collimating lens (1-3), and an objective lens (1-4) are sequentially arranged. On one side of the beam-splitting prism (1-2), a collimating and focusing lens (1-5), a semi-transmissive and semi-reflective mirror (1-6), an astigmatic lens group (1-7), and a photodetector (1-8) are sequentially arranged. It is characterized in that: In the reflection optical path of the semi-transmissive and semi-reflective mirror (1-6), a coupling lens (3) and a first optical fiber (4) are successively provided. The first optical fiber (4) is connected to the first input end (5-1) of the wavelength division multiplexer (5). A detection light emission module (6) with a target optical fiber wavelength is provided. The detection light emission module (6) is connected to the second input end (5-2) of the wavelength division multiplexer (5) through a second optical fiber (7). The wavelength division multiplexer (5) combines the signals transmitted by the first optical fiber (4) and the second optical fiber (7). The output end (5-3) of the wavelength division multiplexer (5) is successively connected to a semiconductor optical amplifier (9) and a tunable band-pass filter (10) through a third optical fiber (8). The optical fiber signal output by the band-pass filter (10) successively passes through an optical detector (11), a signal amplifier (12), a DSP digital signal processor (13), and a decoding chip (14) to output the final stored data.

2. The optical disc library system for directly transmitting optical storage laser signals through optical fibers according to claim 1, wherein The coupling lens (3) adopts a double-lens coupling method of a first lens (3-1) and a second lens (3-2). The first lens (3-1) turns the light beam into parallel light, and the second lens (3-2) focuses the parallel light. An isolator (3-3) is provided between the first lens (3-1) and the second lens (3-2). The end face of the first optical fiber (4) is located at the focusing focal point position when the light beam with a wavelength of 404 nm passes through the second lens (3-2).

3. An optical disc library system for directly transmitting optical storage laser signals through optical fibers according to claim 1 or 2, characterized in that The wavelength division multiplexer (5) is provided with a housing (5-4). An interference filter (5-5) composed of a multilayer dielectric film filter with a wavelength selection characteristic of 404 nm is provided in the housing (5-4). The first input end (5-1) and the second input end (5-2) are respectively arranged on opposite sides of the interference filter (5-5). The output end (5-3) is on the same side as the second input end (5-2).

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