Embodiments of the present invention are directed to a modular optical device with a component insert for sending andor receiving optical signals. When authentication is demanded from a mobile terminal 30 to an authentication server 10, the authentication server 10 transmits verification code for authentication to the mobile terminal 30. subjecting the resulting mixture to a first heating under pressure;iii. More products can be thus displayed in a given space, less inventory needs to be warehoused and customers can shop more conveniently. This filter material is strength enough for practical use and also exhibits a high separation efficiency. Subsequently, the resin composite particle is mixed with an adhesive resin to obtain a fiber treating agent.