let prompt = Alert.create({
      title: 'Subscribe to our service',
      message: "All the fields are necessary",
      inputs: [
      ...
      {
        name: 'path',
        placeholder: 'Path',
        value: JSON.stringify(this.testArray)
      },
      {
        name: 'cycle',
        placeholder: 'Cycle: once/weekly/monthly'
      },
      {
        name: 'object_type',
        placeholder: 'Farm/Solarpanel/plain'
      },
      ],
      buttons: [
      {
        text: 'Cancel',
        handler: () =>  {
          console.log('Cancel clicked');
        }
      }
      ]
    });

    this.nav.present(prompt);

import { Modal, NavController, NavParams } from 'ionic-angular';

@Component(...)
class YourPage {

 constructor(nav: NavController) {
   this.nav = nav;
 }

 presentSubscriptionModal() {
   let subscriptionModal = Modal.create(Subscription, { yourParam: paramValue });
   this.nav.present(subscriptionModal);
 }

}

@Component(...)
class Subscription{

 constructor(params: NavParams) {
   let param = params.get('yourParam');
 }

}