CN2645350Y - Non-optical-fiber laser communication receiver - Google Patents

Abstract

A non-optical-fiber laser communication receiver consists of a receiving aerial and a condenser arrangement, which is a non-optical-fiber laser communication receiver adopting an optical-fiber collimating device, The receiving aerial 1 consists of the object lens 1a and the eye lens 1b which are on the same optical axis. The condenser arrangement adopts the optical-fiber collimating device 2 which is positioned at one side of the eye lens 1b. The object lens 1a, the eye lens 1b of the receiving aerial 1 and the optical-fiber collimating device which are the same optical axis are all positioned in the housing 3. The optical-fiber collimating device consists of a collimating lens 2a, the inner optical-fiber 2b, the glass sleeve 2d, the metal sleeve 2e, the fiber pigtail 2f and the fiber connector 2g. One inner end of the metal sleeve 2e is provided with the collimating lens 2a. The backside of the collimating lens 2a is connected with the inner optical-fiber 2b. The glass sleeve 2d is positioned outside the inner optical-fiber 2b and inside the metal sleeve 2e. One end of the fiber pigtail 2f is connected with inner optical-fiber 2b; the other end is connected with the fiber connector 2g.

Description

Non-fiber laser communication receiver

One, technical field

The utility model is a kind of non-fiber laser communication receiver that has adopted optical fiber collimator, belongs to the technical field of laser communication.

Two, background technology

The non-fiber laser communication is a kind of emerging communication technology.It has transmission rate height, bandwidth, easy for installation, transmission security good, cost is low, need not to apply for advantages such as frequency range.Can be widely used in aspects such as the backup of connection between building communication, last kilometer access, intranet or the local area network (LAN), fibre circuit and fault be emergent.

Therefore the non-fiber laser communication bigger difference of existence on communication mode of communicating by letter with optical-fiber laser, all exist bigger difference in the design of the design of communication device and communication plan.Because Fibre Optical Communication Technology has obtained using widely already, so existing communication device and communication plan mainly are to be used for optical fiber telecommunications system; And be used in the communication device of non-fiber laser communication aspect and communication plan seldom, need specialized designs.

In the non-fiber laser communication technology, receive mode commonly used at present is that incident light is converged on the reception target surface of photodiode, carries out opto-electronic conversion.Therefore, existing most of communication device and communication plan are difficult to be applied directly in the non-fiber laser communication.

Three, summary of the invention

1, technical problem

The purpose of this utility model provides a kind of non-fiber laser communication that is used for, thereby improves communication performance, reduces the non-fiber laser communication receiver of communications cost.

2, technical scheme

The utility model adopts the receiving device of optical fiber collimator as the non-fiber laser communication, formed by reception antenna and optical convergence device, reception antenna is made up of the object lens on the same optical axis, eyepiece, the optical convergence device adopts optical fiber collimator, this optical fiber collimator is positioned at a side of eyepiece, the object lens of reception antenna, eyepiece, optical fiber collimator all are arranged in shell, and same optical axis.Optical fiber collimator is made up of collimating lens, internal optical fiber, glass bushing, metal sleeve, tail optical fiber, the optical fiber connector, end in metal sleeve is provided with collimating lens, rear portion at collimating lens is connected with internal optical fiber, outside internal optical fiber, in the metal sleeve, be provided with glass bushing, one termination internal optical fiber of tail optical fiber, another termination optical fiber connector.

Optical fiber collimator mainly is made up of collimating lens (C-lens or GRIN lens) and optical fiber, can change the diverging light of optical fiber output into directional light, also the incident light that is parallel to optical axis can be coupled into optical fiber.The utility model utilization be exactly that the optical fiber collimator incident light that will be parallel to optical axis is coupled into optical fiber properties.

The available reception antenna of the utility model has Kepler telescope, Galilean telescope, Newtonian telescope, Gregory telescope, Cassegrainian telescope etc., and we are example with Kepler (Kepler) telescope in the design.Kepler telescope is made up of eyepiece and object lens, and the clear aperature of eyepiece is suitable with the clear aperature of optical fiber collimator, and the diameter of object lens is more than 50 times of clear aperature of eyepiece.Introducing telescopical purpose is the receiving area that strengthens incident light, improves the luminous power that receives.

The optical axis of optical fiber collimator and telescopical optical axis coincidence, optical fiber collimator is in telescopical eyepiece one side, and its collimating lens and telescopical eyepiece are approaching.In non-fiber laser communication process, from object lens incident, incident light according to telescopical optics operation principle, also is approximate directional light by the output light behind the eyepiece for approximate directional light to the flashlight by propagation in atmosphere along telescopical optical axis.This approximate directional light enters optical fiber collimator, and the collimating lens that sees through collimater is coupled into optical fiber, thereby has realized the reception of flashlight from the atmosphere to optical fiber.

Receiving device commonly used in the tail optical fiber of optical fiber collimator and the optical fiber communication is linked to each other, can carry out normal signal reception.Equally, the existing fiber communication plan can be incorporated in the non-fiber laser communication, for example, connect fiber grating, can realize the non-fiber laser communication of wavelength division multiplexing at the tail optical fiber of optical fiber collimator.

3, technique effect

The non-fiber laser communication reception technique of this employing optical fiber collimator that the utility model is designed has following several tangible advantage:

(1) the utility model adopts optical fiber collimator as receiving device, and optical fiber collimator has been very ripe product, therefore need not to carry out specialized designs.

(2) employing of optical fiber collimator can make the light path design of non-fiber laser communication gear become flexibly, simple.

(3) utilize optical fiber collimator, existing fiber optic telecommunications equipment can be applied to the non-fiber laser communication.

(4) utilize optical fiber collimator, existing optical fiber communication scheme can be applied to the non-fiber laser communication, for example wavelength division multiplexing (WDM).

Four, description of drawings

Fig. 1 receives structural representation for the non-fiber laser communication of adopting optical fiber collimator, comprising receiving a day receipts antenna 1, object lens 1a, eyepiece 1b, optical fiber collimator 2, collimating lens 2a, internal optical fiber 2b, glass bushing 2d, metal sleeve 2e, tail optical fiber 2f, optical fiber connector 2g, shell 3.

Five, embodiment

Non-fiber laser communication receiver of the present utility model, formed by reception antenna and optical convergence device, wherein reception antenna 1 is made up of the object lens 1a on the same optical axis, eyepiece 1b, the optical convergence device adopts optical fiber collimator 2, this optical fiber collimator 2 is positioned at the side of eyepiece 1b, the object lens 1a of reception antenna 1, eyepiece 1b, optical fiber collimator 2 all are arranged in shell 3, and same optical axis.Optical fiber collimator 2 is made up of collimating lens 2a, internal optical fiber 2b, glass bushing 2d, metal sleeve 2e, tail optical fiber 2f, optical fiber connector 2g, end in metal sleeve 2e is provided with collimating lens 2a, be connected with internal optical fiber 2b at the rear portion of collimating lens 2a, outside internal optical fiber 2b, in the metal sleeve 2e, be provided with glass bushing 2d, the termination internal optical fiber 2b of tail optical fiber 2f, another termination optical fiber connector 2g.

The diameter of optical receiver antenna (is example with the Kepler telescope) object lens is 50mm, and its all areas all are used to receive incident light; The diameter of eyepiece is several millimeters, but its effective aperture that is used for logical light is about 1.0mm, with effective clear aperature consistent size of optical fiber collimator.The focal distance f 1 of object lens is 50: 1 with the ratio of the focal distance f 2 of eyepiece.

The optical axis of optical fiber collimator overlaps fully with telescopical optical axis, and collimater is in telescopical eyepiece 1b one side, and the incident end and the telescopical eyepiece of collimater are approaching.The clear aperature of the optical fiber collimator that we adopted is of a size of about 1.0mm.

In non-fiber laser communication process, from object lens 1a incident, incident light is approximate directional light to the flashlight by propagation in atmosphere, also is approximate directional light by the output light behind the eyepiece 1b along the optical axis of reception antenna.This approximate directional light enters optical fiber collimator, sees through collimating lens 2a and is coupled into internal optical fiber 2b, thereby realized the reception of flashlight from the atmosphere to optical fiber.

Receiving device commonly used in the tail optical fiber 2f of optical fiber collimator and the optical fiber communication is linked to each other, can carry out normal signal reception.Equally, the existing fiber communication plan can be incorporated in the non-fiber laser communication, for example, connect fiber grating, can realize the non-fiber laser communication of wavelength division multiplexing at the tail optical fiber 2f of optical fiber collimator.

The calculating of acceptance angle:

In the statement in front, we suppose that the incident light that telescopical object lens 1a receives is approximately parallel; And in the reality, incident light has certain angle of divergence.

If the angle of incident ray and telescopical optical axis is θ ₁, and be θ from the light of telescope ocular 1b outgoing and the angle of telescopical optical axis ₂According to telescopical geometric optical theory, telescopical angular magnification (r _p) equal objective focal length (f ₁) and eyepiece focal length (f ₂) ratio.And we design the focal distance f of object lens ₁Focal distance f with eyepiece ₂Ratio be 50: 1, promptly

${\mathrm{\γ}}_p=\frac{{\mathrm{\θ}}_2}{{\mathrm{\θ}}_1}=\frac{f_1}{f_2}=50---\left(1\right)$

So, as can be known

θ ₂=50 θ ₁(2) promptly by behind the telescope, the angle of divergence of flashlight has been exaggerated 50 times.

And optical fiber collimator has certain acceptance angle scope, with present common multimode fiber collimater is example, its acceptance angle maximum can reach 1.10 ° (i.e. 19.30 milliradians), the maximum angle that can receive light and optical axis is 0.55 ° (i.e. 9.65 milliradians), all can by optical fiber collimator be coupled into optical fiber in this scope with interior incident light with the angle of optical axis.Can get according to formula (2)

${\mathrm{\θ}}_1=\frac{{\mathrm{\θ}}_2}{50}=\frac{9.65}{50}=0.193\mathrm{mrad}---\left(3\right)$

Promptly the angle with the optical axis of reception antenna all can be coupled into optical fiber by the reception antenna optical fiber collimator in this scope with interior incident light.So the receiving angle of reception antenna is θ ₁Twice, i.e. 0.386 milliradian.This acceptance angle can receive fully in engineering design and in using.

Claims (2)

1, a kind of non-fiber laser communication receiver, formed by reception antenna and optical convergence device, it is characterized in that reception antenna (1) is made up of the object lens on the same optical axis (1a), eyepiece (1b), the optical convergence device adopts optical fiber collimator (2), this optical fiber collimator (2) is positioned at a side of eyepiece (1b), the object lens (1a) of reception antenna (1), eyepiece (1b), optical fiber collimator (2) all are arranged in shell (3), and same optical axis.

2, non-fiber laser communication receiver according to claim 1, it is characterized in that optical fiber collimator (2) is by collimating lens (2a), internal optical fiber (2b), glass bushing (2d), metal sleeve (2e), tail optical fiber (2f), the optical fiber connector (2g) are formed, end in metal sleeve (2e) is provided with collimating lens (2a), be connected with internal optical fiber (2b) at the rear portion of collimating lens (2a), outside internal optical fiber (2b), be provided with glass bushing (2d) in the metal sleeve (2e), one termination internal optical fiber (2b) of tail optical fiber (2f), another termination optical fiber connector (2g).